You'll want to do a dry compression test and a wet (couple of squirts of oil in
each spark plug hole) compression test.
Compare your dry test numbers to the manufacturers specifications. If they are
considerably under the specs. THEN do the wet test.
A dry test can tell you: that you might have a faulty head gasket if two
adjacent cylinders have low readings, or if the pressure builds up erratically
(as you crank the engine) the problem could be burned valve seats or sticky
valve guides.
A wet test is done to help diagnose WHY your compression is low, it is not done
to confirm low readings on the dry test.
e.g. On a wet test, if the compression increases to nearly normal then the
rings, piston, and cylinder (for that cylinder) are probably in need of service.
If the pressure does not increase then the valves are probably in
need of service.
That's my understanding of compression tests.
Bud
71 TR6 CC57365
71 TR6 CC65446
____________________Reply Separator____________________
Subject: Rings
Author: "Ronald A. Dowty" <rdowty@iso.net>
Date: 02/18/1999 9:58 AM
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I have the head removed on my engine. I think the rings are OK. Buy the way,
it's a TR 6. Can I tell if the rings are in good or bad shape without
replacing the head and running a compression check? What kind of results
should I get on a compression check if I replace the heads and run it? I am
thinking that I will put the head back on and do a compression check
immediately and if the results are bad then it'll come right back off.
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From: "Ronald A. Dowty" <rdowty@iso.net>
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Subject: Rings
Date: Thu, 18 Feb 1999 09:58:41 -0600
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