Quote:
Originally Posted by tompaah7503
Just bought a compression tester, so I'll join the discussion by asking..
What psi/bar-ranges would indicate major trouble? What is normal readings?
I have two 617's (.910 & .912) and a 616.934, they're well worn all three of them. At what point should I know on the gauge glass and mumble "uh oh"?
Valves are adjusted on all of them.
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My opinion FWIW is that you want to look for at least 300 psi and the readings should all be within 10% of each other. Anything much below 300 is probably getting pretty well worn. For example my 617 turbo engine lost compression in one cylinder (100 psi) and the other "good" cylinders were down to about 250 psi; telling me that it was pretty much worn out (438K miles). This engine would still start with no problem down to about 10-15F (before it lost one cylinder), below that you had to plug it in or really work at getting it started.