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Old 07-16-2003, 07:02 PM
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Join Date: Nov 2002
Posts: 10
Question Loose Serpentine Belt

I have a 1991 300te MB. Two months ago I installed a new belt. Recently it loosened and started slipping. It became so loose I could remove the belt. I have tried to adjust the belt tensioner but it will not adjust enough to tighten the belt. All the components seem solid...(no loose alternator, etc..) I am assuming I have a bad belt tensioner. Is this correct or should I look at something else before purchasing the tensioner???
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Old 07-16-2003, 07:32 PM
pifcat2's Avatar
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Join Date: Jun 2003
Location: Willow Glen
Posts: 299
It's a common mistake that people try to adjust the tensioner screw without loosening the lock bolt. You may want to replace the attached gas spring too.
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Old 07-16-2003, 08:15 PM
Gilly's Avatar
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Join Date: Mar 2001
Location: Evansville WI
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It's not uncommon for the tensioner to fail either.

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Old 07-17-2003, 10:10 AM
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Join Date: Jul 2001
Location: SoCal
Posts: 1,303
Assuming you know (and knew) the proper way to adjust belt tension, then the tensioner is likely all that has failed. Tension is provided by torsion on a molded rubber bushing, and the bushing separates with deterioration from age. If you ever adjusted the tension without loosening the locking bolt, then you probably also broke the adjuster - ordered separately.

'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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Old 07-31-2003, 06:46 AM
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Join Date: Jan 2003
Location: Epsom Downs, England
Posts: 152
Check that the tensioner actually tensinns the belt, it may have siezed.

If it's ok, just buy the next size belt down.
Paul Gibbons
'93 320CE
'73 Jensen Interceptor (Resting)
Giant Full Sus Mountain Bike
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