Pulley tensioner and belt
Thanks!
Your car is a 2012 E350 so you've got the first year M276.
Unless your pullies are making noise, I would suspect that they are fine (especially at a paltry 73k mi).
On my M272 engine on my 2006 E350, I snapped the serpentine belt at 73k miles coincidentally enough. With that memory lingering, I replace the serp belt on my 2012 M276 at 70k miles just for preventative measures.
The belt that I removed was in brand new condition. It is MUCH beefier than the belt used on the M272. All of my M276 pullies were as new as well.
Swapping the belt took about 4 minutes. Search M276 serpentine belt on here and you'll find some help.




Last edited by S550e; Sep 2, 2020 at 02:38 PM.
I just had this replaced under warranty on my 2011 E550 - Dealer charged my Warranty company a mere $530 - I thought that was highway robbery...but from what S550e quoted - maybe thats not out of place...
Maybe another thread - my Dealer charges $185 an hour - I'm in the wrong profession!
If it had been out of warr. I would do it myself!
Cheers




I just had this replaced under warranty on my 2011 E550 - Dealer charged my Warranty company a mere $530 - I thought that was highway robbery...but from what S550e quoted - maybe thats not out of place...
Maybe another thread - my Dealer charges $185 an hour - I'm in the wrong profession!
If it had been out of warr. I would do it myself!
Cheers
Last edited by S550e; Sep 5, 2020 at 06:30 PM. Reason: Typo, price was way off



