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OT 3.1 L GM engine
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Posted by teddy52food on February 18, 2007 at 08:19:18 from (204.73.107.177):
I have a 99 Buick engine apart. It has almost 200,000 miles but was serviced well. It had a head gasket leaking to the outside, none in the engine. The engine was noisy so rather than just changing gasket, we pulled it to check it out. All bearings look good ,wrist pins ok only about .002 cly wear. Pistons without rings will slide freely with a .003 feeler gauge and are almost tight with a .005 gauge. It used no oil. I checked one main bearing that showed a little grooving, with plastigage .002 . The crank is at the macnine shop to be polished. He said it would take std bearings. I am at a loss to find the noise before I put it all back together. It is not noisy cold but gets worse when hot. STP did not help. The lifters all bleed down normally. It didn't sound like a lifter noise. I sounded like the pistons in the ac compresser were loose, but we took off the belt & it didn't change. Is there anyone at GM that I could call?
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