2015 Mercedes C300 Belt Tensioner Replacement W205

The serpentine belt tensioner was making a squealing sound on cold start and was jolting back and forth slighty. I paid $172 Canadian for the belt tensioner at the Mercedes dealership. Once the Tensioner was replaced the car ran smooth and no noise is present now. Make sure to subscribe and drop a like for this video. Thank you for watching!

[@moisesheredia2597]

Thank you! Just replaced mine today with the help of this video!

[@charvakkarpe]

Thanks! I'm replacing my water pump today, have a new belt and tensioner as well, and your video helps me see what I'm about to do with the tensioner.

[@omarkafi7361]

Thank you Really helpful 😊

[@emirankingvictor8522]

It's really help ❤❤

[@davidestate]

What about the torque spec for the bolt? Does the tensioner self adjust on it's own? While I don't have this car, I have C450 AMG that is making someone of the same noise.. I know it probably a bigger jobs on my engine but looking forward to it if needed.

[@johnfitch5365]

How did it sound before?

[@sagew7377]

My 2015 only squeaks for a moment when I press the throttle in gear on a cold engine. I assume this is my issue but is there any way to apply just a bit more tension as it seems the car runs fine and only struggles when cold? Am I risking ruining my belt which I think is fine otherwise?

[@alifnajmi8967]

It's probably due to humidity because a bad belt will squeak whether in cold or hot engine .

[@nigamsubedi6443]

Where are you based of? Maybe i can swing by for future issues

[@hoangtubehoangtube]

How long should be change the belt tensioner ? 100K mile is good to change ?

[@majesticwhips8683]

The Belt Tensioner on this car had worn out at 67000kms. This is the fastest i have seen a Belt tensioner worn out. Usually they last much longer and there is no certain Mileage when to change it. If the belt tensioner starts to jolts and makes noises while the engines running its a good time to change it. Rattling, chirping and squealing sounds can be some of the noises it can make. Hope this helps and thanks for watching. Please hit the Subscribe button and drop a like!

[@Laurentiu_Dediu]

Hello all! Can anyone help? My car (C Class 2015) has been making this weird noise, like a metal clashing sort of noise. Any suggestions what it could be??

[@petestocks]

Anybody know the torque value for the retaining bolt?

[@verlindeke]

@@Laurentiu_Dediu I have the same type of noise you are talking about. Here it is the tensioner. When the engine is producing the sound ( cold engine for me ). Look at the tensioner, as the noise comes up, you'll see it shivver (i don't know how to explain differently). Good luck

[@Laurentiu_Dediu]

@@verlindeke I think you're right. I'll go to a mechanic this week. Thanks for your reply.