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Old 08-18-2002, 01:03 PM
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Join Date: Nov 2001
Posts: 53
testing acc. belt pulleys

Serp. Belt removed---

#1 If the bearings are not completely silent they need to be replaced right? Power steering pump is smooth and quiet, wish I could say the same for the others, all make noise to a varying degree.

#2 Couldn't find a definitive answer in the archives, does anyone know if I can just have new bearings pressed into the idler pulley? Or are they "special" bearings as I have read?

#3 Will be putting new seals on the front side of the engine, any pointers/tips/caveats greatly appreciated.

Almost to the peak of the 100,000 miles parts hill I hope, can't wait to ride down hill for a bit. (Better not say that too loud, that power steering pump I was bragging about might hear me.)


1990 300E (118K)
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Old 08-18-2002, 08:01 PM
pmizell's Avatar
Benz Zealot
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
If you haven't tried lubricating the pulley bearings, try that first -- I can't imagine your pulley bearings going bad at 100k. If they are going bad, I seriously doubt you could purchase just the bearings to press into the old pulley. Would be too much trouble anyhow -- I'd just purchase new pulleys if that's the case.

Also, take a sideways look at your serp belt as the engine is running. Make sure there are no wobbles in the belt and that it is spinning perfectly smooth. You may have a pulley that is not on correctly, or just not pushed in all the way.

Which front seals are you replacing? If you're replacing them all for preventive purposes, follow the job# for removing/replacing the front timing cover ... if you have the CD's for the 124. That should cover just about all of 'em.

Good luck...
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi
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Old 08-18-2002, 08:54 PM
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Join Date: Nov 2001
Posts: 53
thanks, I do have the 124cd, hoping to pick up any anecdotal tips anyone has.

1990 300E (118K)
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