11 28 010 Removing and installing/replacing alternator drive belt (N47 D20 O1)

Special tools required:

Necessary preliminary tasks:

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

IMPORTANT: The drive belt must be replaced if it is contaminated with hydraulic fluid.

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

Courtesy of BMW OF NORTH AMERICA, INC.

Remove drive belt.

Fig 3: Identifying Drive Belt

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.