Odd Compression Test Results
02-20-2019, 04:35 AM
#21
Thread Starter
The classic #4 cylinder liner failure will result in high compression in number 4.
Check the cylinder with a scope, with piston at BDC. Liner failure will look like a wide black stripe.
Do not pull the full pump fuse for a compression test. Fuel will still spray into the cylinders and skew the readings. It is also unhealthy for the engine.
Disconnect the injectors instead.
Check the cylinder with a scope, with piston at BDC. Liner failure will look like a wide black stripe.
Do not pull the full pump fuse for a compression test. Fuel will still spray into the cylinders and skew the readings. It is also unhealthy for the engine.
Disconnect the injectors instead.
02-20-2019, 05:06 AM
#23
Moderator
02-20-2019, 05:54 AM
#24
02-20-2019, 06:18 AM
#25
Thread Starter
02-20-2019, 07:48 AM
#26
40% leakdown? what the **** lol. my 220k motor has 6-8% across all 4 and all read 210psi with 5 cranks.
Something sounds wrong lol.
Something sounds wrong lol.
02-20-2019, 08:42 AM
#27
Thread Starter
02-20-2019, 12:07 PM
#28
Do I understand correctly that the engine runs fine?
02-20-2019, 12:44 PM
#29
Your results seem pretty high for an engine that actually runs. I notice you didn't have the cylinder head cover off during the leakdown test. How did you confirm each cylinder was at TDC during the test? Perhaps you had some valves that were not completely closed?