Hi chazola,

I've attached a link to a tech article that I hope will be useful to you in troubleshooting / fixing your tensioner set-up. If you have any further questions, feel free to post a Comment just below the article and someone will get back to you with more detailed info. Hope this helps and best of luck!

Pelican Technical Article - Mercedes-Benz W124 - Drive Belt Tensioner Replacement


-Dmitry