Re: Compression test results - Saab 900 Bulletin Board - Saabnet.com
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Re: Compression test results
Posted by JD From LA (more from JD From LA) on Thu, 8 Apr 2004 22:49:06
In Reply to: Re: Compression test results, Carl, Wed, 7 Apr 2004 15:35:28
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The head gasket is blown between cylinders 2 & 3 so both are low. That leaves cylinder 4 ten psi below cylinder 1 which is well within spec.
While you have the head off, have it pressure tested to make sure there are no cracks. Have them test the valves for sealing as well.
Regarding compression testing: Was the throttle wide open? Did you put a new o-ring on the threaded nipple that screws into the spark plug hole? Did you take all the plugs outso the starter would turn really fast (300rpm)? Did you run the starter for five compression strokes? If you did ll that, the compression is a little low. Believe it or not, a new head gasket may improve compression in the "good" cylinders as well.
JD
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