Re: #1=130lbs #2,3,4=170lbs...what does this tell me? - Saab 9000 Bulletin Board - Saabnet.com
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Re: #1=130lbs #2,3,4=170lbs...what does this tell me?
Posted by BobS (more from BobS) on Wed, 7 Apr 2004 20:41:32
In Reply to: #1=130lbs #2,3,4=170lbs...what does this tell me?, shawn, Wed, 7 Apr 2004 14:16:28
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Good compression should have all cylinders within 10%. 130 is low and indicates a problem. You need to find where it is leaking, valves, rings, or cylinder head gasket, most likely the later. Are you getting fine bubbles entering the coolant reservoir with the engine rinning? I like to pressurize the cylinders with the piston at TDC on the compression stroke. If there is an appreciable leak you can hear it in the intake, exhaust, crankcase breather, or see bubbles in the reservoir. This takes a spark plug - air hose adapter and careful placement of the crank shaft on 0 degrees TDC.
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