Wet test


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Posted by Sherman in Idaho [24.32.202.166] on Monday, March 18, 2013 at 20:59:53 :

In Reply to: Gauge is bad if all low, 95 psi usually. posted by Chris Case [75.36.44.142] on Monday, March 18, 2013 at 18:32:54 :

I agree that compression coming up after squirting oil in doesn't prove that your rings are bad. On the other hand, compression NOT coming up after squirting oil in definitely proves that the valves are bad. It's easy to do if you have a trigger-type oil can, as long as you have the plugs out anyway. No it's not an absolutely definitive test but it's an easy test that tells you a lot.

Personally, I've never seen that having the throttle wide open or having all the plugs out at the same time has ever made much difference, although theoretically it should. There are some guys who will swear you should throw out your compression gauge because only a leakdown test is meaningful. Maybe that's true with a high compression engine in good condition. I don't know.

All I have is old and half worn out, and I find that a dry and wet compression test tells me way more about the internal condition of the engine, for the amount of time spent doing it, than any other test. For example if you find out that you've got one cylinder missing because it has a stuck or burned valve, then you've saved yourself from wasting lots of time chasing the spark and fuel/air mixture around in circles. Likewise if you find two adjacent cylinders with no compression, and the rest are fine, you can be pretty sure all it needs is a new head gasket.



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