The rattling is a bad bearing in the pulley carrier, and when it gets bad enough the belt starts to run on only one side of the pulley and gets pulled sideways as it goes around. Early failure every time.
Make sure the carrier bearing is good, I seem to remember it’s a standard size and can be replaced, otherwise replace the carrier. Peter > On Nov 7, 2023, at 12:36 PM, Dimitri Seretakis via Mercedes > <mercedes@okiebenz.com> wrote: > > So I finally got to replacing the serpentine belt on the 90 300D 2.5Turbo. > The belt broke leaving me stranded a couple of months ago. I attributed it to > the idler pulley being seized but it’s not actually seized. When the belt > shredded apart, bits of it got wedged behind the pulley giving the impression > that it was seized. So my question is what caused the serpentine belt to fail > catastrophically? The belt drive has been making a rattling noise for a few > years now so I assumed it was the pulley but it doesn’t seem to be bad. I > have a new one on hand so I will replace it anyway. I’m just worried that > there is some other problem. > > Sent from my iPhone > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
