Idler squeak ??... Maybe not - Mercedes-Benz Forum
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post #1 of 2 (permalink) Old 06-20-2019, 11:12 AM Thread Starter
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Idler squeak ??... Maybe not

Here's a little something to think about,... Not too long ago, when I first got my 320.. On a cold start, I would get "idler squeak" for a few seconds.. Once running , for not more than a minute, the squeak would quite down and go away.. I did the normal, "pull the belt and check pulley bearings" service and really could not find any bad bearings... So, I got out my WD40 and I'm going to hit the cold pulley shafts and bearings and see if I can find it that way.. Spayed the idler, nope... Spayed the tensioner, nope.... Spayed the alternator, etc.. It wasn't until, I accidentally got a drop of oil on the belt did the squeak/chirp go away... So I'm thinking "IT'S THE BELT"... I examined the belt, it looks to be new and in good shape.. No matter, I buy the premium DAYCO replacement belt.. AND IT'S DOING THE SAME THING... All awhile that I'm pulling these belts off and on.. I'm having a hard time getting them back over the water pump pulley.. These belts seem to be a bit on the small size.. So I say to myself " F it, I'll get back to it later, it's a new belt, shouldn't be a problem"... In about a weeks time, my new "Premium, Heavy Duty, Dayco" belt is in shreds.. I start checking for warped/damaged pulleys,.. Nope.... I turn my attention to these two problem belts, and surmise "These armored heavy duty belts are too stiff"... When they have to wrap themselves the 3/4 around the alternator pulley, they can't do it.. So, I took my chewed up Premium..and exchanged for a cheap-o "thin" belt.. And now all's good... No more squeaks, no problem getting on and over the pump pulley.. Sometimes, just because it's "Premium" doesn't mean that it's right...
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post #2 of 2 (permalink) Old 06-20-2019, 11:29 AM
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I always go OEM on serpentine belts. One of the few relatively cheap parts on MBs.
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