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Old 02-01-2022, 10:49 AM
compu_85's Avatar
Cruisin on Electric Ave.
Join Date: May 2008
Location: Springfield VA
Posts: 5,210
I have a larger alternator on my car, which stresses the belt tensioner more at idle.

Installing a clutched alternator pulley will make the drive belt last longer, the shock last longer, the spring last longer (mine got a stress crack!), the tensioner bearing last longer; and it will put less stress into the timing cover and crank pulley. There's a reason they became universal on diesel cars once they were introduced in ~1997.

1991 350SDL. 230,000 miles (new motor @ 150,000).

Tesla Model 3. 136,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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Old 02-03-2022, 11:11 AM
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Join Date: Feb 2022
Posts: 1
Smile OM603 problem

The problem is caused by the alternator pully clutch being seized or having been replaced with a solid pully. this will only show at engine idle, the noise coincides with excessive vibration of the belt tensioner and overheats the shock cylinder. Reconditioned alternators usually come with a solid pully and is easily overlooked.

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