11 28 010 Replacing alternator drive belt (M52 / S52 / M52TU / M54 / M56)

NOTE: If the drive belt is to be subsequently reused:
Mark direction of travel and reinstall drive belt in same direction of travel.

Necessary preliminary tasks:

Remove cap from tensioning roller.

Fig 1: Removing Cap From Tensioning Roller

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Relieve tension on belt drive.

Remove drive belt.

IMPORTANT: Drive belt must be replaced if fouled with hydraulic fluid.

Installation:

Check drive belt for coolant and oil residues, replace if necessary.

Fig 2: Relieving Tension On Belt Drive

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Installation:

Check that belt is correctly positioned on belt pulleys.

Fig 3: Checking Belt & Belt Drive

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Version with auxiliary tensioning roller.

Fig 4: Identifying Version With Auxiliary Tensioning Roller

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Installation:

Locking device of auxiliary tensioning roller must snap into groove on alternator.

Fig 5: Identifying Locking Device Of Auxiliary Tensioning

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Version on E85.

Fig 6: Identifying Version On E65

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Version on E60/E65.

Fig 7: Identifying Version on E85

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