Re: compression test ...piston rings - Saab 900 Bulletin Board - Saabnet.com
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Re: compression test ...piston rings
Posted by MC 900t (more from MC 900t) on Tue, 28 Oct 2008 18:27:22
In Reply to: compression test came back good..., eric, Wed, 18 Aug 2004 18:41:13
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There are three piston rings. it is possible that the oil-control ring (the largest of the three piston rings) maybe have worn or broken while the compression rings still hold combustion. Many times i have seen engines with high, even compressions burn oil. A cylinder leak down test might to pin point your diagnosis even more.
check the crankcase vent at the top of the valve cover by removing the plastic snorkel. the vent might already be oil soaked. run the engine and observe any "excessive vapor".
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