This subject has come up a few times in the past. I'm friends with my mechanic and typically the customer complains of noise, upon inspection, the pulley is grinding away the timing cover. They have been using an epoxy to make the part "whole" again. So far no problems with that solution. M.B.DOC determined the engine cutoff number (believe that translates into late MY 2000 cars) where an updated, improved tensioner started to be used.
HTH,
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Brian Toscano
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