11 28 020 Replacing tensioning device for alternator drive belt (S63)
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Special tools required:
- 11 0 390 .
Necessary preliminary tasks:
- Remove alternator DRIVE BELT .
If necessary, remove special tool 11 0 390 .
Release screw (1).
Tightening torque 11 28 1AZ .
Remove belt tensioner with idler pulley (2).
Assemble engine.