Mercedes Benz repair: fanbelt, center bolt, belt tension

Question
I have a 1986 benz 300e and I need some advoice how to replace the fanbelt.

Answer
Make a drawing of how the belt goes on first.
Loosen the adjuster pulley center bolt, loosen the belt tension adjuster nut, change belt and revers the first two steps.
The belt tension adjuster may be corroded and break.

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