Excellent piece of info! I know the tensioner on my 300E is fairly new (PO receipt), but for some reason when I replaced the water pump back in February I could never get it quite as tight as it used to be. As a result, if I really gun the car I can cause the A/C compressor to slip which kills it. I wonder if I need a new tensioner now?

I wonder if the swiveling of the alternator trick will work on the M104? I have an A/C compressor to do this weekend on a friend's car, and I hate to kill his tensioner in the process. As far as I know, it's the original tensioner at 145K.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280