11 28 010 Removing and refitting/replacing drive belt for alternator (N57)

Special tools required:

11 3 340 .

IMPORTANT: Check drive belt for coolant and oil residues, replace if necessary.
The drive belt must be replaced if it is contaminated with hydraulic fluid.
If the drive belt is to be reused, mark direction of travel and reinstall drive belt in same direction of rotation.

Necessary preliminary tasks:

Remove ACOUSTIC COVER at front.
Remove FAN COWL .

IMPORTANT: Belt tensioner (1) is preloaded.

Fig 1: Identifying Belt Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Increase preload on tensioning pulley (1) with tool (2) until special tool can be positioned on tensioning pulley 11 3 340 (1).

Preload belt tensioner (1).

Both bore holes, see arrow, must be flush.

Fig 2: Increasing Preload On Tensioning Pulley

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Routing of drive belt without Dynamic Drive

Remove drive belt.

Fig 3: Identifying Belt Tensioner

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Routing of drive belt with Dynamic Drive

Remove drive belt.

Fig 4: Drive Belt Routing Diagram

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Assemble engine.