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Testing Compression while hanging from engine crane, need help
I have a 7.3 hanging from a engine hoist, I hooked-up starter and batteries (4 of them for good measure and fast crank).
Using a known working digital diesel comp. tester, I was unable to get readings on this engine though I can hear/feel the engine sucking and pushing air (glow plugs out).
Being that this engine timing runs off a CPS, am I ever going to get any reading (same thing that happens when cps goes out on the road).
Number one, two and four cylinders show some small movement of valve springs, the rest just lay there like a dead dog.
I was able to get number one hole to push my gauge to 46 psi. Two injectors are currently removed, but can't see how that would affect comp in other holes.
I just wanted to see if this engines rings/valves held any psi and what kind of life it may have left before I go to the trouble of dropping it into a vehicle.
Any ideas on if this engine hang test is possible would be great.