dapiper Posted November 1, 2004 Share Posted November 1, 2004 Had head crack at #4 cyl intake welded and replaced seat on my custom turbo. Checked fine when fresh before run in but now after 20 mi, compression is down to 130 psi and leakdown at 22-13%. Others 145 psi and 3%. Leakdown and compression were fine even when leaking coolant into chamber before repair. Did not touch lower end. No change in valve clearance. Noticable air noise in crankcase during leakdown test. Squirted oil into cyl, which brought compr up and reduced leakdown to 13% consistant. Air noise now modulated with gushing sound like oil film being sheared intermittantly. Minor air noise now perceptable in intake. Whatya think? Other tests? Quote Link to comment Share on other sites More sharing options...
Guest Magnum Rockwilder Posted November 1, 2004 Share Posted November 1, 2004 If you have leakdown and oil improves compression, the coolant most likely scarred the cyl wall or rings. Quote Link to comment Share on other sites More sharing options...
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