2002 Mercedes SLK 230
At 67,000 miles it was time to replace the serpentine belts. The belt tensioner is loosened with a Torx E10 socket:
This can be used from a 3/8 ratchet — if you have an assistant to help with the belt. Better yet, buy yourself a Serpentine Tool:
There is a front and rear belt. The owners manual contains a belt routing diagram. If you don’t have one, draw a diagram becasue it’s not as obvious as it looks.
Here’s a picture of the rear belt tensioner:
Here’s a picture with the Torx socket attached. I’m pressing down on the ratchet to loosen the belt:
If you look carefully, you’ll see I was also changing the oil. The belt replacement took about the same time as it took for the oil to drain.
Updated: January 2017 Contact: Hoeren at Comcast dot net