Broken Spring Tensioner - PeachParts Mercedes-Benz Forum

sf veggiebenz I · #1 10-15-2008, 01:36 AM

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?

Thanks
Mitchell

Shorebilly · #2 10-15-2008, 05:41 AM

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

SB

sf veggiebenz I · #3 10-15-2008, 08:59 AM

Sorry about that, I have a 1999 e300.

sublettm · #4 10-15-2008, 02:51 PM

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.

TMAllison · #5 10-15-2008, 03:27 PM

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.