Catalog: GM Goodwrench Engines Catalog | |
| GENERAL ENGINE DIAGNOSTICS Section IV Page 24 August 2004 Cylinder Leakage Test A cylinder leakage test also checks compression, but in a different way. A special leakage tester, which may or may not be built into an engine analyzer, applies shop air pressure to a cylinder with the piston at TDC on the compression stroke. With the piston at TDC, both valves are closed and very little air should escape except for a small amount past the piston ring gaps. The tester pressure gauge shows leakage as a percent of cylinder compression. While specifications vary, any reading above 20-percent would ... | |
| GENERAL ENGINE DIAGNOSTICS Section IV Page 26 August 2004 Engine Mechanical Diagnosis Diagnosing various engine mechanical concerns involves starting with the owner concern (problem symptom), understanding that several possible causes may contribute to that symptom. Also, using certain checks or tests to eliminate some causes and to find the root cause. Concern Possible Cause Check or Test Engine will not turn over Electrical failure (battery, starter, solenoid) Hydrostatic lock Seized engine Turn engine over by hand to verify that this is not a mechanical failure. Determine fluid ... | |
