I recently had the water pump replaced in my '86 300E. The job was done at an indy shop. The owner is a 30 yr MB mechanic but he has a young guy working for him. I don't think the young guy is much of a mechanic on the older MBs. He reinstalled the tensioner pointer so that it was buried all the way to the left (facing the engine) so you could barely find it. I repositioned it back down but I don't think it is working right.

I went back to the shop and the owner simply said to test the belt tension by feel. I wasn't too happy but didn't push the issue. I guess I'll use the manual tensioning test from now on.

P.S. I also found that one of the bolts on the power steering pumps had not been tightened after that job. It was very loose. I would be reluctant to go back to that shop.

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1986 300E
1993 Volvo 940 Wagon
1984 Volvo 240 (daughter's)
1976 Dodge 1/2T pickup, gas hog