1982 Mercedes Benz 300sd

Engine Mechanical problem
1982 Mercedes Benz 300sd Two Wheel Drive Automatic 250000 miles

how do you get the belt loose is there a secret bolt? I put a new alternator on it and cant get the pump belt loose to replace the alternator belts it loose but there seems to be something holding it I found 3 bolts to loosten the pump am I missimg 1?
David morris
December 21, 2008.

Hello -

I believe this what you are talking about.

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V-belt A Alternator - coolant pump

1. Loosen nut (1) and screws (2 and 3).

2 Tension V-belt by means of nut (5) of tensioning screw (4).
3 Tighten nut (1) and screws (2 and 3).
4 Continue turning nut (5) by approx. 1/4 to 1/2 turn (to tight seat).

Dec 21, 2008.