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Old 01-15-2001, 12:58 PM
mbdoc mbdoc is offline
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Almost all Benz & BMW engines use these plastic timing chain rails. The fault is in the tensioner on MB V-8's, if they fail then chain damage is certain. Most of the time a rattle on start-up is noticed well before failure. ALSO turning the engine backwards will cause the rails to fail! Many times failure happens after a water pump replacement as many techs turn the engine backwards to access bolts! OF course if they knew better THAT wouldn't happen. Tensioners fail due to oil change frequency. Or should I say lack of IT.
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