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Old 08-07-2002, 06:05 PM
mbdoc mbdoc is offline
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Any valve can burn! Lack of HEAT transfer is most common reason for failure. However a defect in the valve can cause the valve to burn as well.
MOST MB exhaust valves are sodium filled to help with heat transfer.

Since most engines have hydraulic lifters now, we see less burnt valves than on earlier engines.
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