Topcow,

The 84 already has a double chain. What you most likely have is bent valves on the left bank;it's a classic.What happens is the chain stretches past the limits of the chain tensioner because of extended oil change intervals or high mileage.The chains starts to whip until it breaks off the chain rail in the left head.The broken rail then lodges between the chain and the left bank sprocket causing it to skip and bend the valves.The right bank is usually not affected.Adding to this is poor design on the part of Mercedes;it seems they chose to screw steel head bolts into aluminum.Now the repair will require helicoils which should have been installed at the factory.

Peter

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