If you have the new style spring tensioner, there will be a 15mm nut in the center of the tensioner pulley. IF you have the old style, you will have a tensioning rod. If this is the case, you will have to loosen the clamp bolt (10mm allen) that is just below the pulley and then loosen the adjustment rod.

I usually replace the tensioners on the 119 engine. I have had many, many of them fail at bad times.

__________________
Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS

resurrecting an old thread because this thread is what my search found and to thank Benzmac for the useful post.

also note, as sixto says, some have a Torx E10 nut. --Fwiw, my 1997 S320 has the standard 15mm hex nut.



The belt can be replaced w/o removing the fan or shroud.

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