CGC

So i have a squeak coming from my belt. I think it might be the tensioner, but i'm not sure. Anyone have an idea on what squeaks first generally on the W204? I know this is a random question and could be any of the idlers, just hoping for more ideas. I used my stethiscope and was not able to determine which one was the culprit.

Plutoe

I would say that if you did the stethoscope then it's not the tensioner or idler---keep looking and have you noticed any belt ware!!

CGC

With the stethoscope it was loudest at the tensioner, it just wasn't a high pitch sound like I was hearing. Of course the sound tends to go away when it warms up. No belt ware.

StrelingA

its not the tensioner its the idler pulley at the top of the motor a little the left. had this same problem... ecs tucnning has the kit with belt

CGC

Perfect! Do you happen to know the part number? I looked on their site and didn't see any that came with the belt.

StrelingA

https://www.ecstuning.com/b-genuine-...2722000270kt1/


https://www.ecstuning.com/b-genuine-...2722000270kt2/

pezzy669

Would you recommend the full rebuild/replace of the idler and tensioner pulleys once the belt wears out? My original belt on my '09 is making a little bit of noise when cold @ 70k miles and I am sure it is nearing end of life due to dry rot. Just curious if I don't have pulley noise yet if I should just replace them when I do the belt.

Thanks in advance!

StrelingA

Yes when u change your belt do it because it will go bad sooner or later ..IMO just to have a piece of mind..

CGC

I picked up the belt kit. I was surprised to find I didn't have E-torx bits considering I have a Snap on box full of tools. Does anyone know the size you need for the tensioner bolts?

Adi-Benz

I just did my tensioner, I had noise from belt (literally just replaced it 10 minutes ago). Sound is gone and its smooth. $30 win. I believe the torx screws are E13. Check "pelicanparts c300 diy" and there should be a diy with all the info.

CGC

Thank you!