11 28 020 Replacing tensioning device for alternator drive belt (S63)

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Special tools required:

Necessary preliminary tasks:

If necessary, remove special tool 11 0 390 .

Release screw (1).

Tightening torque 11 28 1AZ .

Remove belt tensioner with idler pulley (2).

Fig 1: Identifying Belt Tensioner/Idler Pulley And Screw

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Assemble engine.