I talked with a Benz tech.He said possible chain tensioner messed up,and chain is grinding into cover.But not to repair as it will be hard to get aluminum out of block.So I will replace motor and take my time and rebuild the original motor.Thinking of improving performance like a 3.4.Better crank,rods,and pistons.Better cam and valve train.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt