I didn't have any problems with the tensioner. The car was running hot and I was replacing the fan clutch. I wanted to loosen the belt so I could turn the fan pulley to the correct position to use the special tool to remove the fan. That's when I broke the tensioner adjuster. I have a friend who is a Benz tech who told me how to check the tensioner, since I had it off anyway.

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Fourings

84 Audi Coupe GT with Turbo engine, EFI (buh-bye CIS), Jamex seats, Koni's/H&R's, e-code lights. 210k and counting.
1992 Anthracite 400E, 161k, "Grey Ghost".
1986 VW Quantum Syncro, 192k, gone to the crusher in the sky.
1989 300TE 172k. (Was mine, now also Mom's car)
72 280SE 4.5 (Mom's car)