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Old 10-15-2008, 02:36 AM
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Join Date: Jun 2008
Posts: 20
Broken Spring Tensioner

A couple of issues here. On the way home I thought I ran over a twig or rock which was rolling around the engine, apparently the serpentine belt fell off. I checked around the pullies and found that the spring tensioner easily moved up and down. My question is, should I replace both tensioner and shock as well as the belt? What would be the best way to do that? Lastly, does anyone have a picture of the pattern that the serpentine belt winds around the pullies?

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Old 10-15-2008, 06:41 AM
Shorebilly's Avatar
Marine Engineer (retired)
Join Date: Aug 2006
Location: West Virginia
Posts: 1,268
Question Please identify Model and Year of car.....

Folks need to know what model of Benz you have......belts run differently on various models....


'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG
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Old 10-15-2008, 09:59 AM
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Join Date: Jun 2008
Posts: 20
Broken Spring Tensioner

Sorry about that, I have a 1999 e300.
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Old 10-15-2008, 03:51 PM
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Join Date: Mar 2002
Location: Rochester, NY
Posts: 333
When mine went on my '87 300D, I first replaced just the pulley. About a month later, the whole thing broke loose again. The second go around, I replaced the shock, spring, pivot arm, and pulley. As far as the configuration for the belt...that is one that someone else will have to help with as I do not own this car any longer.

'80 300D
'84 300D
'85 300D
'87 300D
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Old 10-15-2008, 04:27 PM
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Join Date: Feb 2004
Location: Walnut Creek, CA & 1,150 miles S of Key West
Posts: 4,874
On your 606.962 you just want to replace the spring that provides the tension. They snap with age which is why they are encased in rubber hose so the pieces don't go flying.

Dealers usually keep them in stock.

Do check the roller pulley and make sure its sealed bearings spin freely and w/o wobbling. Occassionally it is goes out too.

There is a diagram of the belt routing under the hood; on the computer box lid I think.

Tie a string to the belt, fish it up and "pull" the doubled over belt up through the tight spot between harmonic balancer and fan pulleys and up onto the roller pulley.
Terry Allison
N. Calif. & S. of Key West

09' E320 Bluetec 77k
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