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  #1  
Old 01-02-2010, 01:11 AM
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190d belt tensioner noisy at low rpm.

i was told by my mechanic that belt tensioner on my 87 190d is worn and causing nosise at idle.what does it take to replace it,where exactly is it?
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  #2  
Old 01-02-2010, 11:27 AM
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Not familiar with your exact setup but if it is similar to my 603 there is a small shock absorber opposite the tensioner spring. This shock wears and the bushings on the ends wear out and rattle at idle. I know on mine it needs replacement about every 50K miles. Simple to replace and the shock is about $40. Hope this helps.
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  #3  
Old 01-02-2010, 11:55 AM
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Also replace the spring while your at it. Make sure the pivot pin is torqued to 90Nm as well.
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  #4  
Old 01-02-2010, 12:52 PM
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my engine has 2 shocks in the front by fan,is the tensioner that round thing between them,do i have to take belt off to replace it,shocks look ok
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  #5  
Old 01-02-2010, 01:09 PM
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Shock can "look" OK but be totally worn out. Do a search in the DIY section for "belt tensioner" - there should be several how-to's. Better yet, obtain a copy of the FSM on disc.

Shock on left side, spring on right. You will need the tire tool or a gigantic screwdriver to release tension, then do the change out.
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327K on 1986 W201, 602.911, 722.414 2.5 190D ("The Red Baron")
139K on 1993 W124, 104.942, 722.433 2.8 300E ("Queen")

http://farm5.static.flickr.com/4081/...0bb92d3c_m.jpg http://i370.photobucket.com/albums/o...g?t=1325284354

Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.
- Albert Einstein

take a walk down memory lane...
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  #6  
Old 01-02-2010, 07:34 PM
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Make sure you have a diagram of how the belt goes back on.

Hugh Sr
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