Purchased new Febi tensioner. Came pre-set to 90Nm. The unit came with supporting data as to the torque and certification. I read a post were someone went through the trouble to check the load and found it to be a waste of time. As to installation, as per maintenance manual.

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1989 560SL
1986 300SDL
1983 300D (Burning Jet-A)
1982 240D
1995 S600