shawn011274

HI guys,

I am new to this site and have a question regarding the serpetine belt and tensioner pulley positioning on w211 M272. I have installed a new belt but the belt hang of the tensioner pulley by 1/8 inch (see pics). Is this normal? I keep realligning the belt but it ends up slightly hanging off the pulley.

Here is where I removed some tension on the pulley and slid the sepertine belt over on tensioner pulley
https://imgur.com/a/cdaHg

Here is what happens after I run the engine for a few minutes
https://imgur.com/a/e9pbV

Is this the normal position, or should the entire belt sit on the pulley and not be off by 2/16 of a inch


After running, it slides over

shawn011274

I replaced the entire tensioner pulley assembly, not just the pulley.

Racin_fool

Replace the engine belt tensioner assembly, not just the pulley.. the pulley alone will solve nothing unless the bearings are failing.. There was a "fix" years ago to shim the tensioners at the front engine cover, but that was just a band-aid in my opinion..

shawn011274

I am done with MB, apparently now I have three additional issues:

1. Oil in the coolant - replaced oiler cooler seals (supposedly need new oil filter housing, cooler and seals)...thats just the start
2. P2006, Intake manifold runner stuck (Have to replace entire manifold - Just lever is a bandaid)
3. Balance shaft showing possible wear - known 4k repair for a car worth 3-5k

* my girlfriends crappy Nissan versa has more miles on it and does require this much expensive maintenance or have these many issues. As a matter of fact i have owned many cars that don't have these type of issues, let a lone luxury cars.

I think I am going to sell the car and stick with my Lexus. Thanks for the help...good luck :-)