The invention discloses a tool and method for replacing a shaft
bushing at the big end of a connecting rod of a
diesel engine of a million-kilowatt-class
nuclear power plant. The replacing tool comprises a main connecting rod-side
piston positioning and adjusting tool and an auxiliary connecting rod-side
piston connecting rod component positioning tool, wherein the auxiliary connecting rod-side
piston connecting rod component positioning tool is arranged between the upper surface of a balancing block of a
crankshaft of the
diesel engine and the lower bottom surface of an auxiliary connecting rod cylinder; and the main connecting rod-side piston positioning and adjusting tool extends into a main connecting rod cylinder, and a jacking part on the main connecting rod-side piston positioning tool is used for jacking up a piston in the main connecting rod cylinder so as to facilitate the separation of a main connecting rod from an auxiliary connecting rod. By adopting the tool and method for replacing the shaft
bushing at the big end of the connecting rod of the
diesel engine, the disassembly of affiliated pipelines of related cooling water, lubricating oil,
fuel oil and other systems, the removal of a
cylinder head component of the diesel engine, the integral lifting-out of a piston connecting rod component and other conventional replacement works are not required when the shaft
bushing is replaced, and a
crankshaft bearing is directly replaced from an observation hole, thereby greatly saving the working time, obviously shortening the maintenance working period on the premise of not reducing the reliability, and lowering the maintenance cost.