Cylinder Leak Detection Device for Bottom Dead Center Testing
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Solution Overview
Problem
Conventional leak-down tests for internal combustion engines are limited in detecting leaks in the lower section of the cylinder or cylinder block, as they require the piston to be at the top dead center, missing potential leaks in the piston rings and lower cylinder sections, leading to inaccurate diagnoses and increased repair costs.
Innovation Solution
A device that allows for leak detection in the complete cylinder, including the lower section, by positioning the piston at the lower dead center and using a dual gauge leak-down tester to measure air pressure entering and escaping, providing a more precise identification of leak sources within the engine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the piston is positioned at the top dead center during leak-down test, then the test can be performed on the combustion chamber area, but leaks in the lower cylinder section and piston rings cannot be detected
Solution Approach 1:
The patent inverts the conventional approach by positioning the piston at bottom dead center instead of top dead center during the leak-down test. This inversion allows the pressurized air to reach the lower cylinder section and piston rings, enabling detection of leaks in areas that would be inaccessible with the traditional top dead center positioning method.
2Ease of operation
If the conventional leak-down test is performed with piston at top dead center, then the test procedure is simple, but the lower section of the cylinder and piston rings are not subjected to air pressure test
Solution Approach 1:
The patent applies preliminary action by pre-positioning the piston at bottom dead center before initiating the leak-down test. This preparatory step ensures that the cylinder geometry is optimized for detecting leaks in the lower section and piston rings, allowing the subsequent air pressure application to effectively reach these previously inaccessible areas.
3Loss of information
If leaks are detected in the combustion chamber area, then the diagnosis is limited to areas under the engine head, but additional leaks in the lower cylinder section may be ignored
Solution Approach 1:
The patent extends the diagnostic capability into a new dimension by vertically repositioning the piston to bottom dead center, thereby accessing the lower cylinder section that lies below the traditional combustion chamber test area. This dimensional change in piston position enables comprehensive detection of leaks throughout the entire cylinder length, including the previously inaccessible lower section and piston ring areas.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate detection of leaks in the piston, piston rings, and cylinder sections not covered by conventional tests, reducing unnecessary disassembly and repair costs by pinpointing the exact engine components responsible for leaks.
Implementation Method 1
using a dual gauge leak-down tester to measure air pressure entering and escaping
Data Source
AI summary
The invention is directed to a device for detecting cylinder leaks in an individual cylinder of an internal combustion engine having the cylinder head disassembled and wherein the piston in the tested cylinder is positioned at the bottom dead center and wherein a dual gauge leak-down tester is coupled to the herein disclosed device. The device has an internal airtight channel that allows pressurized air to enter from a pressurized air source to the device via a dual gauge leak-down tester and a set of clamps that acting as a security system, allows the user to firmly secure the device on the engine block. Once the device is assembled and secured above the cylinder and pressurized air is allowed to enter the cylinder through the device, leaks in the cylinder or its internal components are detected by comparing the percentage of air pressure indicated by each one of the gauges of the tester in a conventional manner.