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Find the leakdown tester, then find the leak.
The diagnostic capability of a leakdown is really amazing. I did multiple tests on my '66 engine and discovered 45% leakdown in a few of the cylinders. . . when I tore it down, the top rings were broken on FIVE of the rings. The leakdown tester does not lie.
You should try to have the engine at operating temperature when you do the test, but be extremely careful removing the plugs from the engine if it's hot. And I don't mean for your personal safety, although that is a consideration: you don't want to accidentally remove the helicoil in the head along with the plug!
Don't use 100 PSI for the test, either. When I did my test, I used about 35 psi, it makes the test more accurate and there is less risk of accidentally turning the engine over with a ratchet attached to the crank.
Once you have a good, repeatable test for all six cylinders, then you can think about tearing it down.
Any oil leaks?
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'66 911 #304065 Irischgruen
‘96 993 Carrera 2 Polarsilber
'81 R65
Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13)
Ex-'88 Carrera (Sold 3/29/02)
Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04)
Ex-'89 944 Turbo S (Sold 8/21/20)
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