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Ran out of oil, loud knock top of engine - 2002 Chevrolet TrailBlazer

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Sounds like your wrist pin knock. Get a second opinion! A wrist pin is, as has been said before, what connects the piston to the connecting rod, and it is difficult to diagnose. There are several other things that could cause a similar noise, some are as expensive, others are less expensive. If the wrist pin is going bad, letting it go un-repaired can turn your engine into scrap metal, but in many cases, repairing a wrist pin is not cost effective, because you can sometimes buy an entire new engine for the same money. If you ever question what a mechanic tells you, go get a second opinion! There are unscrupulous mechanics out there, and you don't want to get ripped off.

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Posted on Aug 06, 2010

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