I'm at 170,000 with my m104 I replaced idler pulley 9 month ago from Phil,the best parts.I have slipping belt noise on ocassion,last 5 to 10 seconds.may repeat when at idle.I know the adjuster can go bad,but its near water pump time, an maybe alternator?.Faster easyway to trouble shoot this one.In alway search forum first,could find no help.

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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