Engine assembling method

Abstract

The invention relates to the technical field of engines, in particular to an engine assembly method which comprises the following steps: a cylinder body is positioned on a tray and enters an assembly production line; a piston and a connecting rod are arranged on the cylinder body, a gear train is arranged on the crankshaft and the cylinder body, and a flywheel shell is arranged on the cylinder body; an oil pan is mounted at the lower end of the cylinder body; a cylinder gasket and a cylinder cover are mounted on the cylinder body; a cam shaft seat is arranged on the cylinder body, and a cam shaft and an auxiliary assembly of the cam shaft are arranged on the cam shaft seat; a valve chamber cover is mounted on the cylinder cover; an oil-gas separator cover plate is mounted on the cylinder body, a high-pressure oil rail is mounted on the camshaft seat, and an intake manifold is mounted on the cylinder cover; a starter assembly, a cylinder cover water outlet main pipe and accessories of the cylinder cover water outlet main pipe are installed on the flywheel shell; an exhaust pipeline and accessories of the exhaust pipeline are installed on the cylinder cover; a generator and an air conditioner compressor are installed on the cylinder body. Interference in part assembly in the engine assembly process can be avoided, the labor cost is reduced, and the production period is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of engines, and in particular to an engine assembly method. Background Art

[0002] With the development of the automobile industry, more and more vehicles are entering the field of production and life, providing great convenience for people's transportation and logistics. In a vehicle, the engine is the power source. The assembly effect of the engine will directly affect the performance of the vehicle. In the engine assembly process, there are many parts and the process is relatively complicated. If the process is not designed reasonably, there will be interference in the assembly process of parts, resulting in rework, which will increase labor costs and extend production time.

[0003] Therefore, an engine assembly method is needed to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide an engine assembly method, rationally design the process, thereby avoiding interference in the assembly of parts during the engine assembly process, reducing labor costs and shortening the production period.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The engine assembly method comprises the following steps:

[0007] S1. The cylinder block is positioned on a pallet and enters an assembly line; a solenoid valve plug, a bowl-shaped plug and a cylinder liner are installed on the cylinder block; an oil cooling nozzle, a main bearing cap and a crankshaft are installed on the cylinder block;

[0008] S2, installing a piston and a connecting rod on the cylinder body, installing a gear train on the crankshaft and the cylinder body, and installing a flywheel housing on the cylinder body; installing a front oil seal seat, a rear oil seal seat and a trapezoidal frame on the cylinder body;

[0009] S3, installing an oil pan at the lower end of the cylinder block, and assembling a flywheel to the output end of the crankshaft; installing a carbon scraper ring on the top of the cylinder liner, and installing a cylinder gasket and a cylinder head on the cylinder block;

[0010] S4, installing a camshaft seat on the cylinder block, installing a camshaft and its accessory assembly on the camshaft seat; installing a valve cover on the cylinder head, and sequentially installing an oil filter, a cooler assembly on the cylinder block, installing a shock absorber on the crankshaft, and installing an air compressor assembly and a fuel pump on the cylinder block;

[0011] S5, installing an oil-gas separator cover plate on the cylinder block, installing a high-pressure oil rail on the camshaft seat, and installing an intake manifold on the cylinder head; installing an oil dipstick on the cylinder block, installing an oil pan screw plug on the oil pan, and installing a power steering pump on the flywheel housing;

[0012] S6. Installing the starter assembly, the cylinder head water outlet manifold and the auxiliary components of the cylinder head water outlet manifold on the flywheel housing;

[0013] S7, installing an exhaust pipeline and its accessory components on the cylinder head, and installing a water pump and its accessory pipelines on the cylinder body;

[0014] S8. Install a generator and an air-conditioning compressor on the cylinder block, and install an engine wiring harness.

[0015] In some embodiments, step S1 includes the following steps:

[0016] Screw the hook into the cylinder head bolt hole of the cylinder body;

[0017] Pass the sling through the hook hole, make sure the cylinder is level at the lifting point, align the two round holes below the cylinder with the positioning support on the pallet, and lower at a constant speed until the cylinder is seated;

[0018] The hook and the sling are disassembled.

[0019] In some embodiments, installing the flywheel housing in step S2 includes the following steps:

[0020] Wipe the joint surface between the flywheel housing and the cylinder body to ensure the cleanliness of the joint surface;

[0021] Lift the installation side of the flywheel housing close to the cylinder body, align the flywheel housing with the positioning pin hole and insert it synchronously, and after ensuring that the flywheel housing is stable, install the flywheel housing bolts into the corresponding bolt holes on the cylinder body.

[0022] In some embodiments, installing the flywheel in step S3 comprises the following steps:

[0023] S41, placing the flywheel horizontally on the table, placing the bearing horizontally on the bearing mounting hole of the cylinder body, and using a jig to align and hammer in the bearing;

[0024] S42, lift the flywheel, align it and insert it into the crankshaft positioning pin hole, install the flywheel bolt into the flywheel hole, and pre-tighten it with a wrench;

[0025] S43, installing the fixing tire of the flywheel on the flywheel and tightening the flywheel bolts.

[0026] In some embodiments, step S4 includes the following steps:

[0027] Installing the oil pump control valve plug and the camshaft frame sealing strip on the cylinder block, and tightening the mounting bolts on the cylinder head;

[0028] A camshaft timing intermediate gear is installed on the cylinder block; a camshaft seat is installed on the cylinder head, and a camshaft is installed on the camshaft seat;

[0029] A rocker arm and a sensor thereon are installed on the camshaft, a gear chamber cover plate is installed on the cylinder head, and the clearance of the valve connected to the rocker arm is adjusted.

[0030] In some embodiments, in step S5, installing the oil dipstick comprises the following steps:

[0031] Installing the dipstick tube, the dipstick tube joint and the sealing ring onto the cylinder body;

[0032] An engine oil dipstick is installed in the dipstick tube.

[0033] In some embodiments, step S6 includes the following steps:

[0034] Install the assembled water intake joint seat assembly onto the cylinder body with bolts;

[0035] Install the quick-connect fitting with the combined gasket onto the water intake fitting seat;

[0036] Installing an O-ring on the cylinder head water outlet manifold, and then installing the cylinder head water outlet manifold on the cylinder head;

[0037] The two ends of the air pump water pipe assembly are respectively installed on the water intake joint seat and the cylinder head water outlet main pipe using hinge bolts and combined washers.

[0038] In some embodiments, in step S7, the installation of the accessory components of the exhaust pipe includes the following steps:

[0039] Install the turbocharger assembly at the exhaust manifold port of the exhaust pipeline;

[0040] Soak the end of the oil return pipe of the turbocharger assembly with the O-ring in lubricant for 2 seconds and then insert it into the oil hole on the left side of the cylinder block;

[0041] A gasket is placed on the other end of the oil return pipe assembly of the turbocharger assembly, and the gasket is installed on the turbocharger assembly with a hexagonal flange bolt.

[0042] In some embodiments, in step S8, a wiring harness bracket is installed on the cylinder block, and the wiring harness bracket is used to support the engine wiring harness.

[0043] In some embodiments, in step S8, the output end of the crankshaft and the generator, as well as the output end of the crankshaft and the air-conditioning compressor are driven by a poly-V belt.

[0044] Beneficial effects of the present invention:

[0045] The engine assembly method provided by the present invention sequentially installs the inner cavity parts, transmission and combustion mechanisms of the cylinder body, the valve mechanism such as the cylinder head and rocker arm above the cylinder body, the engine gear train side, and the engine intake side and exhaust side according to the spatial layout and assembly logic. By reasonably designing the process, interference of parts assembly during the engine assembly process can be avoided, labor costs can be reduced, and production period can be shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0047] Figure 1 The present invention is a flow chart of an engine assembly method. DETAILED DESCRIPTION

[0048] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0049] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0050] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0051] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0052] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0053] In the process of assembling the engine, in order to reasonably design the process, so as to avoid interference in the assembly of parts during the engine assembly process, reduce labor costs and shorten the production period, such as Figure 1 As shown, the present invention provides an engine assembly method. The engine assembly method comprises the following steps:

[0054] S1. The cylinder block is positioned on the pallet and enters the assembly line; the solenoid valve plug, bowl plug and cylinder liner are installed on the cylinder block; the oil cooling nozzle, main bearing cap and crankshaft are installed on the cylinder block;

[0055] S2. Install the piston and connecting rod on the cylinder body, install the gear train on the crankshaft and the cylinder body, and install the flywheel housing on the cylinder body; install the front oil seal seat, the rear oil seal seat and the trapezoidal frame on the cylinder body;

[0056] S3. Install the oil pan at the lower end of the cylinder block and assemble the flywheel to the output end of the crankshaft; install the carbon scraper ring on the top of the cylinder liner, and install the cylinder gasket and cylinder head on the cylinder block;

[0057] S4. Install the camshaft seat on the cylinder block, install the camshaft and its accessory assembly on the camshaft seat; install the valve cover on the cylinder head, and install the oil filter and cooler assembly on the cylinder block in sequence, install the shock absorber on the crankshaft, and install the air compressor assembly and fuel pump on the cylinder block;

[0058] S5. Install the oil-gas separator cover on the cylinder block, the high-pressure oil rail on the camshaft seat, and the intake manifold on the cylinder head; install the oil dipstick on the cylinder block, the oil pan plug on the oil pan, and the power steering pump on the flywheel housing;

[0059] S6. Install the starter assembly, the cylinder head water outlet manifold and the accessory parts of the cylinder head water outlet manifold on the flywheel housing;

[0060] S7. Install the exhaust pipe and its accessory parts on the cylinder head, and install the water pump and its accessory pipes on the cylinder body;

[0061] S8. Install the generator and air conditioning compressor on the cylinder block, and install the engine wiring harness.

[0062] According to the spatial layout and assembly logic, the cylinder body's inner cavity parts, transmission and combustion mechanisms, the cylinder head and rocker arms and other valve mechanisms above the cylinder body, the engine gear train side, and the engine intake and exhaust sides are installed in sequence. Through the reasonable design of the process, the interference of parts assembly during the engine assembly process can be avoided, the labor cost can be reduced, and the production period can be shortened.

[0063] In some embodiments, step S1 includes the following steps:

[0064] Screw the hook into the cylinder head bolt hole of the cylinder body. Pass the lifting belt through the hook hole, confirm that the cylinder body is level at the lifting point, align the two round holes under the cylinder body with the positioning support on the pallet, and lower it at a constant speed until the cylinder body is seated. Remove the hook and lifting belt. Specifically, first, use a rag to wipe the contact surface between the pallet positioning support and the cylinder body, and visually confirm that there are no impurities. Use a rag to wipe the contact surface of the main bearing cover flow frame, visually confirm that there are no impurities, and then hoist and position the cylinder body.

[0065] In some embodiments, in step S1, a nameplate needs to be printed. The process of printing the nameplate is as follows: in automatic mode, after the cylinder body of the engine arrives at the work station, the nameplate marking machine automatically reads the machine model information and prints the nameplate, which is pushed to the external silo after printing. In semi-automatic mode, enter the machine model in the printing program, enter the starting serial number in the numbering, enter the ending serial number in the ending serial number, enter the number of nameplates to be printed for each engine in the number of repetitions, click the "Print" button to start printing, the nameplate is automatically printed continuously, and is pushed to the external silo after printing. In manual mode, the operation method is the same as the semi-automatic mode, and one nameplate is printed each time. After the nameplate is printed, check that the nameplate content is consistent with the engine serial number and BOM requirements. The number of nameplates to be printed is printed according to the number required by the BOM; use a barcode printer to print the engine information barcode, and stick the corresponding barcode on the engine nameplate of the corresponding engine.

[0066] In some embodiments, the installation process of the bowl-shaped plug and the cylinder liner is as follows: apply a circle of sealant on the mounting hole of the cylinder body, put the bowl-shaped plug on the mold, align it with the mounting hole of the cylinder body, and use a hammer to knock it in, ensuring that the mold is perpendicular to the cylinder body. After it is installed in place, clean up the overflowed sealant with a rag. Visually confirm whether there are any bumps and scratches on the inner and outer surfaces of the cylinder liner. After confirming that there are no bumps and scratches, place the cylinder liner on the table, evenly apply molybdenum disulfide on the cylinder liner sealing ring (requires a 1:1 engine oil dilution ratio), and install it into the cylinder liner sealing ring groove. Note that the size of the cylinder sealing ring is thicker at the top and thinner at the bottom, ensure that it is installed in place, and clean up the overflowed molybdenum disulfide. Put the 6 cylinder liners into the cylinder liner holes of the cylinder body in turn, and use both hands to press the cylinder liner into the cylinder body at the same time to ensure that it is pressed into place, and visually confirm that the cylinder liner rubber ring has not fallen off or overflowed. Use a handheld numbering machine to number the cylinder body, and visually confirm that the cylinder body number information and position are complete.

[0067] In some embodiments, the process of installing the oil cooling nozzle on the cylinder block is as follows: First, use a 1000N torque wrench to loosen the main bearing cap bolts at one time, and use an electric wrench to remove the main bearing cap bolts. First remove the main bearing cap bolts on the intake side, lift the bolts on the scheduling side and tap the bolt head with a rubber hammer. After the tile cover is loosened, remove the tile cover and the bolts simultaneously, and place the tile installation surface facing up on the flow rack. Before installation, wipe the upper and lower tiles of the main shaft with an alcohol wipe to ensure the cleanliness of the tile surface. Before installation, visually check whether the upper and lower tiles have any bumps or scratches on the surface. After confirming that there are no abnormalities, install the upper tile on the cylinder block. Note that the tile key is aligned with the tile groove of the cylinder block, and the lower tile is installed in the tile cover groove. After installation, ensure that the edges of the upper and lower tiles are flush with the edges of the slot holes (manually adjust if uneven). After the tiles are installed, wipe the upper and lower tiles with an alcohol wipe to ensure cleanliness. Before installation, visually confirm that the oil cooling nozzle has no bumps, deformation, cracks, etc., and check that the oil cooling nozzle installation hole has no sand holes, scratches, iron filings, etc. Align the 6 oil cooling nozzles to the nozzle installation holes of the cylinder body, ensure that they are installed in place, align the nozzle bolts with the bolt holes and screw them in more than 2 turns, pre-tighten with an electric wrench, use a pointer wrench to tighten to a torque of 27N·m, and mark with a white pen.

[0068] In some embodiments, the installation process of the main bearing cap and the crankshaft is as follows: Before assembly, visually inspect the crankshaft surface for bumps, scratches, and rust, and clean the crankshaft journal with a cloth dipped in alcohol. Use an oiler to evenly apply oil to the upper bearing surface of the main shaft. Use a sling to move the crankshaft to the top of the cylinder block, and slowly align the operating handle and place it into the crankshaft cavity at a uniform speed. Be careful not to bump the crankshaft against the cylinder block during the placement process, and evenly apply oil to the journal. After the crankshaft is in place, push the crankshaft to the pulley side, pre-install an upper thrust plate on the thrust plate holding groove and place it well, and confirm that there is a layer of oil film on the surface of the upper thrust plate. If not, the upper thrust plate needs to be dipped in oil in the oil dipping box. Push the crankshaft to the flywheel side, pre-install another upper thrust plate on the thrust plate holding groove and place it well, and insert the two lower thrust plates into the corresponding positions of the main shaft upper cover (2 cylinders), and note that the side with the oil groove faces the crankshaft. Use a brush with a silk cover to brush a small amount of engine oil on the inner side of the threads of the two rows of bolts. Align the main bearing cap with thrust plates on the tile cover tray and the corresponding bolts of the other main bearing caps with the locating pins and insert them into the main bearings. Use a rubber hammer to hit them. Use a brush to brush a small amount of molybdenum disulfide (the oil dilution ratio needs to be 1:1) on the joint between the main bearing cap and the bolt. Screw the main bearing cap bolts in more than 2 turns by hand, and then use an electric wrench to bring the transition fit end bolts together, and then bring the clearance fit end bolts together. Use a digital wrench to tighten the main cap bolts, and tighten them symmetrically from the middle to both sides (the same main cap should tighten the transition end bolts first and then the clearance end bolts). Use a white pen to mark after tightening. Fix the magnetic gauge seat on the cylinder block, press the dial gauge head against the rear end face of the crankshaft, pry the crankshaft with a crowbar, return the pointer to zero, and then pry in the opposite direction to check the value displayed by the pointer. The clearance value is 0.140mm-0.362mm, which meets the requirements. Insert the turning plate onto the crankshaft, then insert the pointer wrench into the turning plate and turn the crankshaft at a constant speed for one circle to check whether the static torque of the crankshaft meets the requirements.

[0069] In some embodiments, in step S2, the piston and connecting rod are first packaged. Visually inspect the piston surface for bumps and scratches, and use circlip pliers to install the piston pin circlip on one side of the piston (install on the side opposite to the piston arrow). Install the piston rings by hand (in the order of 2 air rings - 1 air ring - oil ring) into the piston ring groove. The TOP mark faces the combustion chamber, and the oil ring opening is 180° apart from the inner spring opening. Place the piston side into the piston connecting rod tray, with the skirt opening facing up and the side with the circlip facing down; turn the connecting rod with the boss side up (the connecting rod boss is in the same direction as the piston arrow), align the small head hole and the piston hole, and then insert the piston pin into the piston pin hole after applying oil; use circlip pliers to install a circlip on the other side of the piston pin hole. First, use a marker to draw a line on one side of the connecting rod (the line needs to pass through the expansion section), use an electric wrench to completely loosen the connecting rod bolt, use a rubber hammer to knock on the expansion position of the connecting rod until the connecting rod is separated from the tile cover, and use a silk cloth with alcohol to clean the expansion section and the upper and lower tile covers to keep them clean. Before installation, visually check whether there are any bumps and scratches on the surface of the upper and lower tiles. After confirming that there are no abnormalities, install the upper connecting rod tile into the connecting rod tile groove, and the lower tile into the tile cover groove. After installation, ensure that the edges of the upper and lower tiles are flush with the edges of the slot holes (manually adjust if uneven). After the upper and lower tiles are installed, wipe them with an alcohol wipe to ensure cleanliness.

[0070] In some embodiments, the process of installing the connecting rod and piston is as follows: turn the crankshaft so that the crankshaft journal is slightly below the middle of the cylinder body, turn the piston ring so that the openings of each piston ring are not aligned, and the adjacent piston ring openings are 90°-120° apart; the oil ring opening is staggered with the piston pin by 30±10°. Install the guide tooling on the cylinder sleeve, put the piston installation tooling on the piston to clamp the piston ring, and then pick up the connecting rod end together and send it into the cylinder hole first. Be careful not to bump against the inside of the cylinder sleeve when the connecting rod enters (evenly apply engine oil inside the steel sleeve and the piston skirt before installation). Push the connecting rod in until the piston installation tooling fits the cylinder body, then lift the piston installation tire with one hand, and use the piston installation rod with the other hand to push the piston, and push the piston connecting rod assembly completely into the cylinder hole. Before pushing the piston connecting rod in, the opposite operator first pads the piston connecting rod assembly pad in the engine to facilitate the introduction of the connecting rod. Put the bolt of the connecting rod cap of the corresponding cylinder number in by hand for more than 2 turns, and then tighten it to the connecting rod with an electric wrench. Before installation, confirm that there is an oil film on the surface of the bolt thread (if not, brush a small amount of engine oil on the thread), and evenly apply a layer of molybdenum disulfide on the bolt joint surface (the oil dilution ratio needs to be 1:1). Before installation, visually check to confirm that the connecting rod bearing has not fallen out. After installation, confirm that there is a lot of string between the connecting rod caps and check that the marking lines match. After installing the piston connecting rod, continue to turn the car to install the connecting rods of other cylinders. Note: Turn the car clockwise. After the connecting rod is installed in the cylinder, use a digital wrench to tighten the connecting rod bolts. Mark with a white pen, and finally measure the rotational torque.

[0071] In some embodiments, in step S2, two Q5210816 locating pins are driven into the locating pin holes of the front oil seal seat of the cylinder body using a mold. Two Q5211226 locating pins are driven into the locating pin holes of the flywheel housing using a mold. One 1005031-68E locating pin is driven into the crankshaft flywheel locating pin hole of the cylinder body. One Q5210612 locating pin is driven into the gear locating pin hole of the cylinder body.

[0072] In some embodiments, the installation process of the gear train is as follows: visually inspect the appearance quality of the gear for bumps and scratches, draw a white pen mark line on the gear shaft oil hole corresponding to the outer position of the gear shaft, then apply oil to the pre-bolted timing intermediate gear shaft and install it into the timing intermediate gear, install it into the cylinder body, and tighten the bolts (note that the position of the gear shaft oil hole is vertically upward during installation), apply oil to the pre-bolted air pump gear shaft and install it into the air pump intermediate gear, and then install the gear to the specified position of the cylinder body (note that the position of the gear shaft oil hole is vertically upward during installation), screw the bolts in more than two turns, tighten them with an electric wrench, and then use a pointer wrench to calibrate and mark with a white pen. Install the timing intermediate stack gear. At this time, it is necessary to ensure that one tooth marked with "1" on the crankshaft timing gear is engaged, between the two teeth marked with "1" on the timing intermediate stack gear, and then tighten the bolts to fix it. Push the timing intermediate gear to the side of the cylinder head, leaving a certain gap, and then tighten it to fix it, and mark with a white pen.

[0073] In some embodiments, installing the flywheel housing in step S2 includes the following steps: wiping the joint surface between the flywheel housing and the cylinder body to ensure the cleanliness of the joint surface. Lift the installation side of the flywheel housing close to the cylinder body, align the flywheel housing with the positioning pin hole and insert it synchronously, and after ensuring that the flywheel housing is stable, install the flywheel housing bolts into the corresponding bolt holes on the cylinder body. Before installing the flywheel housing, visually confirm that there are no bumps or scratches on the glued surface before gluing, and then wipe the glued surface on the cylinder body with a wiping cloth dipped in alcohol to ensure the cleanliness of the joint surface. Use a pneumatic glue gun to evenly apply 5970 sealant on the cleaned joint surface along the trajectory to ensure that the glue line is continuous and complete. If the glue line is broken, replenish it with a glue gun in time.

[0074] In some embodiments, the installation process of the front oil seal seat is as follows: Before installation, visually confirm whether there are any quality problems such as bumps, scratches, and sand holes on the joint surface between the cylinder body and the front oil seal seat. Use a wiping cloth dipped in alcohol to wipe the joint surface between the front oil seal seat and the cylinder body to ensure the cleanliness of the joint surface. Use a pneumatic glue gun to evenly apply 5970 sealant on the cleaned joint surface according to the trajectory to ensure that the glue line is continuous and complete. If the glue line is broken, use a glue gun to replenish it in time. Visually confirm whether there are any bumps and scratches on the surface of the front oil seal seat. After confirmation, pick up the front oil seal seat and align it with the positioning pin to install it. Install the bolt into the corresponding bolt hole of the front oil seal seat and screw it in more than 2 turns. Use an electric wrench to tighten it and then use a pointer wrench to calibrate the torque, and use a white pen to mark and confirm. Confirm the appearance quality of the front oil seal before installation. After confirmation, apply Vaseline on the inner and outer rings of the oil seal and put it on the front oil seal press jig (make sure the surface of the jig head is clean before placement). Align the jig and insert it into the front oil seal hole, then screw the two positioning bolts on the front oil seal press head into the crankshaft and tighten manually. After confirming that the fit is firm, use an electric wrench to tighten the middle press bolt of the jig. After the jig limit end face and the crankshaft are fully in line, use an electric wrench to loosen the middle press bolt. Then manually unscrew the two positioning bolts on the jig, remove the jig, clean the overflowed Vaseline with a wiping cloth, visually confirm the front oil seal press state, and use a depth gauge to test, the depth is 0mm.

[0075] In some embodiments, the installation process of the rear oil seal is as follows: before installation, confirm the appearance quality of the rear oil seal, confirm that the inner and outer rings of the rear oil seal are coated with vaseline, and then put it on the jig for pressing the rear oil seal (make sure the surface of the jig head is clean before placement). Align the oil seal tire and insert it into the oil seal hole at the flywheel end, then screw the two positioning bolts on the jig into the crankshaft and tighten them manually, and after confirming that the fit is firm, use an electric wrench to tighten the middle press-fit bolt of the jig, and after the limit end face of the jig is completely in line with the crankshaft, use an electric wrench to loosen the middle press-fit bolt, and then manually unscrew the two positioning bolts on the jig, remove the jig, clean the overflowed vaseline with a wiping cloth, visually confirm the pressed-in state of the oil seal, and use a depth gauge for inspection, the depth is 5.5mm.

[0076] In some embodiments, the installation process of the ladder frame is as follows: install the flywheel housing cover plate to the flywheel housing with 2 M8 bolts. Install the ladder frame to the cylinder body with 20 M10 bolts, tighten the bolts with an electric wrench and calibrate with a preset wrench, the torque is 39±7N·m, and mark with a white pen.

[0077] In some embodiments, step S2 also includes installing an oil pump and an oil collector. Install two sealing rings on the oil pump assembly, then install the oil pump assembly to the front oil seal seat, and fix it with three M10*60 and two M10*70 bolts. Feel the oil pump gear for axial and inter-tooth clearance. Install the oil collector and sealing ring on the oil pump, fix it with two M10*40 bolts, and mark it with a white pen.

[0078] In some embodiments, installing the oil pan includes the following steps: using a wiping cloth dipped in alcohol to clean the joint surface of the oil pan gasket to ensure that there are no impurities, and using a pneumatic glue gun to apply two glue lines on the three-in-one surface on both sides of the cylinder body, with a glue line width of 2-4mm and a length of 5cm. Screw the two guide rods into the bolt holes of the oil pan and install them diagonally, and then insert the oil pan gasket into the guide rods according to the bolt hole positions and place them flat on the cylinder body. Two people lift the two ends of the oil pan, the protruding position corresponds to the position of the oil pump, align and insert the guide rods, and slowly lower it at a uniform speed. After confirming that the bolt holes of the oil pan and the cylinder body are aligned, unscrew the two guide rods. Align the oil pan bolts and install them into the oil pan, screw them in for more than 2 turns, tighten them with an electric wrench and a universal wrench, and then use a preset wrench to tighten them, tighten them symmetrically from the middle to both sides, and mark them with a white pen.

[0079] In some embodiments, the installation of the flywheel in step S3 includes the following steps: S41, placing the flywheel horizontally on the table, placing the bearing horizontally corresponding to the bearing mounting hole of the cylinder body, and using a jig to align and hammer the bearing; S42, lifting the flywheel, aligning and inserting it into the crankshaft locating pin hole, installing the flywheel bolt into the flywheel hole, and pre-tightening it with a wrench; S43, installing the flywheel fixing tire on the flywheel and tightening the flywheel bolt. Before assembly, manually apply engine oil to the machining surface on the back of the flywheel, the flywheel bolt thread, and the flange joint with the flywheel.

[0080] In some embodiments, two cylinder head locating pins are driven into the locating pin holes on both sides of the cylinder body joint surface using a jig, and visually confirm whether there are foreign objects and impurities in the combustion chamber. Visually confirm the appearance quality of the carbon scraper ring before installation, and after confirmation, install the carbon scraper rings into the top of the six cylinder liners respectively. Before installation, confirm the appearance quality and model of the cylinder gasket, and put the cylinder gasket into the cylinder head locating pin and install it in place.

[0081] In some embodiments, the subassembly process of the cylinder head is as follows: after the cylinder head is received, the appearance quality and model of the cylinder head are confirmed. After confirming that there is no abnormality, the cylinder head is hoisted to the table using a hoist (it is necessary to confirm that the surface of the table is clean and free of debris to prevent secondary scratches). After the cylinder head is placed stably, visually check whether there are any bumps and scratches inside the valve guide and on the lip, and whether there are any defects such as blockage and sand holes at the intake and exhaust ports. After confirming that there are no abnormalities, evenly apply a layer of engine oil on all valve guide lips. Before assembly, visually confirm the appearance quality of the valve guide oil seal. After confirming that there is no abnormality, put the oil seal into the valve guide lip and press it in manually. After all the oil seals are manually pressed in, put the oil seal tire into the oil seal and firmly press it in. Use a hammer to hit the head of the mold twice (the second mold needs to be rotated more than 45°) to ensure that the oil seal is firmly pressed in. After the installation is completed, lift the inserted oil seal by hand to check whether it is missed. At the same time, visually confirm whether the oil seal spring has any abnormal phenomenon of falling off. After confirmation, mark it with a white pen. Manually flip the cylinder head 90° and ensure that the cylinder head is stable. Confirm the model and appearance quality of the intake and exhaust valves. After confirmation, oil the heads of the 12 intake valves and 12 exhaust valves respectively, and install them into the valve holes of the cylinder head and make sure they are firm (the length of the 6DV intake valve is longer than the exhaust valve, and the base diameter is larger than the exhaust valve). Flip the cylinder head 90° so that the valve heads face upward, and insert the intake and exhaust valve springs onto the intake and exhaust valves respectively, and place the valve spring seat on the valve spring to keep it stable. Use the lock clamp to press the tire down to install the lock clamp, and install all the intake and exhaust valve lock clamps in turn. After all the lock clamps are installed, use a rubber hammer to knock on the valve heads in turn to check whether the lock clamps are installed firmly. If they fall off, reinstall them in time. Flip the cylinder head 90° again, and use a dial indicator to measure the valve sinking amount. 6DV1 intake valve: recessed -0.12mm~0.18mm, 6DV1 exhaust valve: recessed 1.06mm~1.36mm. After the measurement is completed, the cylinder head is restored to a horizontal position.

[0082] In some embodiments, the hoisting process of the cylinder head is as follows: use a hoist to lift the assembled cylinder head, wipe the bottom of the cylinder head with a white silk cloth to ensure that there are no impurities on the bottom, move the cylinder head to the top of the cylinder body, and insert two cylinder head bolts into the cylinder head bolts as guide rods, slowly and evenly seat the cylinder head, and after confirming that it is firmly seated, pull out the two cylinder head bolts.

[0083] In some embodiments, in step S4, all camshaft seat bolts are removed using an electric wrench, and the camshaft lower seat and seven camshaft upper seats are removed and placed on a pallet, all camshaft seat bolts are taken out at the same time, and new bolts are installed in the middle row of the camshaft lower seat.

[0084] In some embodiments, step S4 includes the following steps: installing the oil pump control valve plug and the camshaft frame sealing strip on the cylinder block, and tightening the mounting bolts on the cylinder head. Installing the camshaft timing intermediate gear on the cylinder block; installing the camshaft seat on the cylinder head, and installing the camshaft on the camshaft seat. Installing the rocker arm and the sensor thereon on the camshaft, installing the gear chamber cover plate on the cylinder head, and adjusting the clearance of the valve connected to the rocker arm.

[0085] In some embodiments, the pre-installation and tightening of the cylinder head bolts include the following steps: Use a brush to evenly apply a layer of molybdenum disulfide on the surface of the cylinder head bolt hole (requires an oil dilution ratio of 1:1). Visually confirm that the threaded part of the cylinder head bolt is not damaged by bumps, and use a brush to evenly apply engine oil on the threaded part of the bolt. Insert the cylinder head bolts into the cylinder head bolt holes respectively and screw them in more than 2 turns by hand. Use an electric wrench with an 18-inch socket to pre-tighten the cylinder head bolts in a symmetrical and cross-order from the middle to both sides. Use a digital wrench to tighten all cylinder head bolts in a symmetrical and cross-order from the middle to both sides. Use a marker to write the letter "T" on all bolt heads in the same direction (make sure that all T letters are written in the same direction). Switch the digital wrench to the angle gear, and turn 90° clockwise in a symmetrical and cross-order from the middle to both sides. After tightening, visually confirm whether the turning positions of all "T" letters are consistent. Then use a digital wrench to turn 180° clockwise in a symmetrical and cross order from the middle to both sides, and visually confirm whether the turning positions of all "T" letters are consistent. After confirmation, mark with a white pen.

[0086] In some embodiments, the fuel injector needs to be installed in step S4, and the process of installing the fuel injector is as follows: before installation, confirm whether the copper gasket of the fuel injector is missing, use a brush to evenly apply grease on the seal ring of the fuel injector, and assemble the bolts, spherical gaskets, and pressure plates into the assembly. Wear clean gloves to pick up the top of the fuel injector, insert the fuel injector into the fuel injector hole of the cylinder head, insert the fuel injector pressure plate assembly into the fuel injector slot, screw the bolt in more than 2 buckles, press the protective cover on the top of the fuel injector with both hands and press down hard until you hear a "click" sound to install the fuel injector in place, press all the fuel injectors in turn, and then remove the fuel injector protective cover. Fix the fuel injector so that the fuel injector oil hole is facing the high-pressure oil pipe installation hole of the cylinder head, tighten the bolts with an electric wrench, and then use a pointer wrench to turn the corner 90° clockwise, and mark with a white pen after completion.

[0087] In some embodiments, the process of installing the camshaft timing intermediate gear is as follows: install the cylindrical pin into the timing intermediate gear shaft, apply engine oil on the timing intermediate gear shaft, put on the timing intermediate gear and thrust plate, then align the cylindrical pin with the locating pin hole on the cylinder head, use a hexagonal flange bolt to tighten the three hexagonal flange bolts.

[0088] In some embodiments, the assembly process of the camshaft seat is as follows: two people lift the camshaft frame and install it on the cylinder head to ensure that it is seated in place. Use an oiler to evenly spray a layer of engine oil on the camshaft lower seat, visually confirm the camshaft model and appearance quality, and install the intake and exhaust camshafts on the camshaft lower seat according to the corresponding position and timing marks. After installation, use a flashlight to confirm whether the timing marks match. Place the camshaft upper seat on the camshaft according to the marking number, and manually screw the bolts in more than 2 turns. Use an electric wrench to tighten the camshaft upper seat bolts. After tightening each set of camshaft upper seat bolts, confirm whether the camshaft has axial stringing. If there is axial clearance, the upper seat can be tightened continuously. If there is no axial clearance, the upper seat bolts need to be loosened, and the group is changed to tighten. Continuously verify during the tightening process until all the upper seat bolts are tightened to keep the intake and exhaust camshafts with axial stringing of 0.15mm-0.40mm. Use a pointer wrench to calibrate the torque of the upper seat bolts, and mark with a white pen after confirmation.

[0089] In some embodiments, the process of installing the rocker arm is as follows: place the exhaust valve bridge on the valve spring seat, grab both ends of the rocker arm with both hands, squeeze inward, pick up the rocker arm and place it at the specified position on the camshaft, insert the rocker arm bolts at both ends first to position them, and after adjustment, insert all the remaining bolts and screw them in more than 2 turns (the rocker arm bolts at the exhaust end need to be inserted into the bracket). Use an electric wrench to bring the rocker arm bolts close, and mark them with a white pen after confirmation. Install the solenoid valve fixing bolts and tighten them.

[0090] In some embodiments, the process of installing the gear chamber cover is as follows: install the gear chamber cover and the sealing ring to the rear end face of the cylinder head; install the flywheel housing observation hole cover and the sealing ring to the flywheel housing. Install the flywheel housing bolts to the flywheel housing. Install the hole to the outside of the flywheel bearing with an elastic retaining ring. Apply vaseline to the crankshaft position sensor rubber ring and install it to the flywheel housing. Install the wire harness bracket to the flywheel housing; use the positioning pins to hammer the two positioning sleeves to the specified position of the oil cooler mounting surface.

[0091] In some embodiments, the process of adjusting the clearance of the valve connected to the rocker arm is as follows: first, at the compression top dead center position of the first cylinder (i.e., the TDC engraved line on the flywheel is seen, and the centers of the camshaft gear timing hole and the peephole of the camshaft gear timing sensor cover coincide), adjust the intake valve clearance of the 1st, 2nd, and 4th cylinders by 0.3mm to 0.35mm, then rotate the flywheel counterclockwise through 86° crankshaft angle (i.e., when the engraved line of "1st, 6th cylinder valve clearance adjustment position" is seen on the flywheel), adjust the exhaust valve clearance of the sixth cylinder by 0.5mm-0.55mm, and then adjust the brake clearance by 2.4mm to 2.45mm. After rotating the crankshaft angle of 120° in sequence, adjust the exhaust valve clearance of each cylinder by 0.5mm in the order of 6-2-4-1-5-3. -0.55mm (After adjusting the exhaust valve clearance of each cylinder to 0.5mm-0.55mm, adjust the brake clearance to 2.4mm~2.45mm at the same time). When the crankshaft turns to 360° (that is, when the TDC mark is seen again), adjust the intake valve clearance of cylinders 6, 3, and 5 to 0.3mm~0.35mm. The tightening torque of the nut is (31±5)N·m. Note 2: After adjusting the clearance of each valve, check with the upper limit valve clearance feeler gauge to ensure that the upper limit feeler gauge cannot pass. After all clearances are adjusted, mark with a white pen. Then install the in-cylinder wiring harness, insert the injector wiring harness head into the corresponding hole of the cylinder head, and lock it with a locking plate. Apply grease before inserting the wiring harness head, and connect the in-cylinder wiring harness with the wire terminals of the injector and the solenoid valve.

[0092] In some embodiments, the process of installing the valve cover is as follows: Align the upper cover sealing strip and insert it into the upper cover groove of the cylinder head. Assemble the upper cover bolts, sleeves and springs, and install them into the upper cover bolt holes. Install the assembled upper cover on the cylinder head, use an electric wrench to pre-tighten the bolts, and then use a pointer wrench to calibrate the torque. Mark with a white pen after the calibration is completed. Then install the oil filter and cooler assembly. Before installation, visually check whether the cooler sealing ring is intact and whether there are any bumps or scratches on the joint surface. After confirming that there are no abnormalities, insert the bolts into the corresponding bolt holes on the cylinder body. Two people lift the cooler assembly, move it to the installation position, align the cooler assembly and insert the locating pins. One person holds the cooler, and the other person screws the cooler bolts in more than two turns. Use an electric wrench to hold the bolts, and use a pointer wrench to calibrate the torque in the order shown in the figure. Mark with a white pen after completion.

[0093] In some embodiments, the process of assembling the shock absorber is as follows: remove the flywheel housing cover, install the flywheel fixing tire on the flywheel and tighten the bolts. Visually confirm that there are no bumps or scratches on the surface of the shock absorber, and evenly apply molybdenum disulfide to the shock absorber bolt hole (the oil dilution ratio requires 1:1). Visually confirm whether the threaded part of the shock absorber bolt is damaged, and then evenly apply engine oil to the threaded part after confirmation. Pick up the shock absorber with both hands and align it with the end face of the crankshaft. The bolts are manually tightened for more than 2 turns, and an electric wrench is used to tighten. Use a digital wrench to tighten in a symmetrical cross sequence. Adjust the digital wrench to the angle gear position, and the angle is 210°±5°. After tightening, remove the flywheel fixing tire and install the flywheel housing cover. Mark with a white pen to confirm the completion.

[0094] In some embodiments, the installation process of the air compressor assembly is as follows: Install the air compressor assembly with two O-rings and the air pump gear assembled on the cylinder body and tighten it with four M10 bolts. Install two quick-connect connectors with copper washers on the air compressor assembly. Then install the fuel pump, crank the crankshaft until it is at the top dead center of the first cylinder, and at the same time, make the camshaft gear also at the top dead center of the first cylinder. Align the mounting bolt holes of the injection pump flange with the corresponding mounting holes on the cylinder body, gently push the oil pump in (if the gears cannot mesh smoothly, you can make slight adjustments to the left and right) and tighten the four fixing bolts. Loosen the pin, install the sleeve between the pin and the oil pump flange, and re-tighten the pin. Install the two quick-connect ring connectors, hinge bolts and combination washers on the top of the oil pump.

[0095] In some embodiments, the process of installing the oil-gas separator cover and pipeline is as follows: Install the oil-gas separator cover and gasket to the cylinder body and tighten with 4 M8 bolts. Install the two ends of the oil inlet pipe to the oil pump and the cylinder body through hinge bolts. Install the air compressor assembly's inlet and return pipes, and connect the two ends to the air compressor assembly and the water intake connector seat respectively. Install the degassing connector and connector to the inlet and return pipes through the sealing gasket. Install the degassing pipe connector to the front face of the cylinder head.

[0096] In some embodiments, the process of installing the high-pressure oil rail on the camshaft seat is as follows: Install the high-pressure oil rail and the oil rail pad on the camshaft frame, and do not tighten the torque. Install the 1-6 cylinder high-pressure oil pipe, and install the two ends to the injection pump and the oil rail respectively. First tighten the nuts at both ends of the high-pressure oil pipe by hand, then tighten the nuts in the order of the injector end first and then the oil rail end, and finally tighten the nuts in the order of the injector end first and then the oil rail end. Tighten the oil rail bolts and tighten the high-pressure oil pipe oil seal bolts.

[0097] In some embodiments, the process of installing the intake manifold is as follows: install the intake manifold to the intake side of the cylinder head through the bolts, gaskets and wire harness bracket. Install the oil pipe from the oil pump to the high-pressure oil rail, first tighten the nuts at both ends of the high-pressure oil pipe by hand, then tighten the nuts in the order of the oil pump end first and the oil rail end, and finally tighten the nuts in the order of the oil pump end first and the oil rail end. Install the high-pressure oil pipe clamp, install the wire harness bracket and tighten the intake manifold bolts. After applying glycerin to the rubber ring, install the intake pressure and temperature sensor to the intake manifold. After applying glycerin to the rubber ring, install the crankshaft position sensor to the flywheel housing.

[0098] In some embodiments, in step S5, installing the dipstick includes the following steps: installing the dipstick tube, dipstick tube joint and sealing ring on the cylinder body; installing the oil dipstick in the dipstick tube. Then, installing the M24 screw plug and combination gasket on the oil pan, and installing the power steering pump, gasket, transition block and shock pad on the flywheel housing.

[0099] In some embodiments, in step S5, it is also necessary to install a fine fuel filter and a return oil pipe, and the steps are as follows: install the pre-separator and the rubber ring on the cylinder block, install the fine fuel filter on the pre-separator, connect the fine fuel filter inlet and return oil pipelines, install the common rail pipe to the cylinder head return oil pipe assembly, install the two ends on the high-pressure fuel rail and the cylinder head respectively, and install the pipe clamp.

[0100] In some embodiments, the process of installing the starter assembly is as follows: the starter assembly is fixed to the flywheel housing with three M14 bolts, and the tightening torque of the bolts is 115±15N·m when the threaded hole on the outer upper end is made of aluminum material. The tightening torque of the bolts is 115±15N·m when the threaded hole on the outer upper end is made of cast iron or steel material, and the tightening torque of the remaining bolts is 115±15N·m.

[0101] In some embodiments, step S6 includes the following steps: installing the assembled water inlet connector seat assembly onto the cylinder body with bolts; installing the quick-connect connector with the combination gasket onto the water inlet connector seat; installing the O-ring onto the cylinder head water outlet main pipe, and then installing the cylinder head water outlet main pipe onto the cylinder head; installing the two ends of the air compressor pump water pipe assembly onto the water inlet connector seat and the cylinder head water outlet main pipe respectively with hinged bolts and combination gaskets.

[0102] In some embodiments, step S6 also includes installing a degassing hose, a water drain switch, an oil pressure sensor, and an exhaust control valve.

[0103] In some embodiments, the process of installing the exhaust pipe is as follows: Install the exhaust manifold, first place the middle section of the exhaust manifold against the exhaust side of the cylinder head by bolts, then place the front section of the exhaust manifold by bringing in the bolts, and then place the rear section of the exhaust manifold by bringing in the bolts, so that the flange stop of the bellows matches the stop of the middle section of the exhaust manifold, place the bellows sealing gasket, and bring in the lower bolts. Pre-tighten the bolts, then tighten the bolts in sequence, and finally tighten the V-clamp nuts. For models with exhaust pipe heat shields, fix the exhaust pipe heat shield to the exhaust manifold with hexagonal flange bolts.

[0104] In some embodiments, in step S7, the installation of the accessory components of the exhaust pipe includes the following steps: installing the turbocharger assembly at the exhaust manifold port of the exhaust pipe; soaking one end of the return oil pipe of the turbocharger assembly with an O-ring in lubricant for 2 seconds and then inserting it into the oil hole on the left side of the cylinder body; padding the other end of the return oil pipe assembly of the turbocharger assembly with a gasket and installing it on the turbocharger assembly with a hexagonal flange bolt.

[0105] In some embodiments, in step S7, a front end gear train bracket needs to be installed on the cylinder body. The flat idler wheel and the tension wheel are installed on the front end gear train bracket.

[0106] In some embodiments, in step S8, a harness bracket is installed on the cylinder body, and the harness bracket is used to support the engine harness. Then two bolts are passed through the generator assembly and the through holes of the front wheel bracket, and are tightened and fixed to the front wheel bracket with two nuts. Two bolts are passed through the air conditioner compressor assembly and the through holes of the front wheel bracket, and are tightened and fixed to the front wheel bracket with two nuts.

[0107] In some embodiments, in step S8, the output end of the crankshaft and the generator and the output end of the crankshaft and the air-conditioning compressor are both driven by a poly-V belt. By using a poly-V belt drive, the stability of the transmission can be ensured.

[0108] In some embodiments, when installing the engine harness, the connectors of the engine harness and the connectors of the sensor are connected and inserted in a one-to-one correspondence.

[0109] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An engine assembly method, characterized in that: The steps include: S1. The cylinder block is positioned on a pallet and enters an assembly line; a solenoid valve plug, a bowl-shaped plug and a cylinder liner are installed on the cylinder block; an oil cooling nozzle, a main bearing cap and a crankshaft are installed on the cylinder block; S2, installing a piston and a connecting rod on the cylinder body, installing a gear train on the crankshaft and the cylinder body, and installing a flywheel housing on the cylinder body; installing a front oil seal seat, a rear oil seal seat and a trapezoidal frame on the cylinder body; S3, installing an oil pan at the lower end of the cylinder block, and assembling a flywheel to the output end of the crankshaft; installing a carbon scraper ring on the top of the cylinder liner, and installing a cylinder gasket and a cylinder head on the cylinder block; S4, installing a camshaft seat on the cylinder block, and installing a camshaft and its accessory assembly on the camshaft seat; Installing a valve cover on the cylinder head, and sequentially installing an oil filter and a cooler assembly on the cylinder block, installing a shock absorber on the crankshaft, and installing an air compressor assembly and a fuel pump on the cylinder block; S5, installing an oil-gas separator cover plate on the cylinder block, installing a high-pressure oil rail on the camshaft seat, and installing an intake manifold on the cylinder head; installing an oil dipstick on the cylinder block, installing an oil pan screw plug on the oil pan, and installing a power steering pump on the flywheel housing; S6. Installing the starter assembly, the cylinder head water outlet manifold and the auxiliary components of the cylinder head water outlet manifold on the flywheel housing; S7, installing an exhaust pipeline and its accessory components on the cylinder head, and installing a water pump and its accessory pipelines on the cylinder body; S8. Install a generator and an air-conditioning compressor on the cylinder block, and install an engine wiring harness.

2. The engine assembly method according to claim 1, characterized in that: The step S1 comprises the following steps: Screw the hook into the cylinder head bolt hole of the cylinder body; Pass the sling through the hook hole, make sure the cylinder is level at the lifting point, align the two round holes below the cylinder with the positioning support on the pallet, and lower at a constant speed until the cylinder is seated; The hook and the sling are disassembled.

3. The engine assembly method according to claim 1, characterized in that: The installation of the flywheel housing in step S2 comprises the following steps: Wipe the joint surface between the flywheel housing and the cylinder body to ensure the cleanliness of the joint surface; Lift the installation side of the flywheel housing close to the cylinder body, align the flywheel housing with the positioning pin hole and insert it synchronously, and after ensuring that the flywheel housing is stable, install the flywheel housing bolts into the corresponding bolt holes on the cylinder body.

4. The engine assembly method according to claim 1, characterized in that: The installation of the flywheel in step S3 comprises the following steps: S41, placing the flywheel horizontally on the table, placing the bearing horizontally on the bearing mounting hole of the cylinder body, and using a jig to align and hammer in the bearing; S42, lift the flywheel, align it and insert it into the crankshaft positioning pin hole, install the flywheel bolt into the flywheel hole, and pre-tighten it with a wrench; S43, installing the fixing tire of the flywheel on the flywheel and tightening the flywheel bolts.

5. The engine assembly method according to claim 1, characterized in that: The step S4 comprises the following steps: Installing the oil pump control valve plug and the camshaft frame sealing strip on the cylinder block, and tightening the mounting bolts on the cylinder head; A camshaft timing intermediate gear is installed on the cylinder block; a camshaft seat is installed on the cylinder head, and a camshaft is installed on the camshaft seat; A rocker arm and a sensor thereon are installed on the camshaft, a gear chamber cover plate is installed on the cylinder head, and the clearance of the valve connected to the rocker arm is adjusted.

6. The engine assembly method according to claim 1, characterized in that: In step S5, installing the oil dipstick comprises the following steps: Installing the dipstick tube, the dipstick tube joint and the sealing ring onto the cylinder body; An engine oil dipstick is installed in the dipstick tube.

7. The engine assembly method according to claim 1, characterized in that: The step S6 comprises the following steps: Install the assembled water intake joint seat assembly onto the cylinder body with bolts; Install the quick-connect fitting with the combined gasket onto the water intake fitting seat; Installing an O-ring on the cylinder head water outlet manifold, and then installing the cylinder head water outlet manifold on the cylinder head; The two ends of the air pump water pipe assembly are respectively installed on the water intake joint seat and the cylinder head water outlet main pipe using hinge bolts and combined washers.

8. The engine assembly method according to claim 1, characterized in that: In step S7, the installation of the auxiliary components of the exhaust pipe includes the following steps: Install the turbocharger assembly at the exhaust manifold port of the exhaust pipeline; Soak the end of the oil return pipe of the turbocharger assembly with the O-ring in lubricant for 2 seconds and then insert it into the oil hole on the left side of the cylinder block; A gasket is placed on the other end of the oil return pipe assembly of the turbocharger assembly, and the gasket is installed on the turbocharger assembly with a hexagonal flange bolt.

9. The engine assembly method according to claim 1, characterized in that: In the step S8, a wiring harness bracket is installed on the cylinder block, and the wiring harness bracket is used to support the engine wiring harness.

10. The engine assembly method according to claim 1, characterized in that: In the step S8, the output end of the crankshaft and the generator, as well as the output end of the crankshaft and the air-conditioning compressor are driven by a poly-V belt.

Images