Quote:
Originally Posted by vwnate1
I can't offer any ideas about them except that I'd certainly remove all 5 prechambers, look for damage then crank the engine with them out to see if the noise changes or a tiny bit of crap comes flying out....
*Much* less work than replacing the entire engine .
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YES-Totally agree. Also, if you can get a borescope and have a look in the combustion chamber and top of the pistons, you should be able to see evidence of a piston hitting the head if it has a bad con rod bearing.