11 28 010 Replacing alternator drive belt (N52)

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Special tools required:

11 3 340

IMPORTANT: Aluminium-magnesium materials.

No steel screws/bolts may be used due to the threat of electrochemical corrosion.

A magnesium crankcase requires aluminium screws/bolts exclusively.

Aluminium screws/bolts must be replaced each time they are released.

The end faces of aluminium screws/bolts are painted blue for the purposes of reliable identification.

Jointing torque and angle of rotation must be observed without fail (risk of damage ).

Necessary preliminary tasks:

Remove fan cowl.
Mark the direction of rotation of the drive belt if it is to be reused.

Turn belt tensioner (4) in direction of arrow until bore (2) is flush on housing.

Hold belt tensioner (4) under tension.

Fig 1: Identifying Belt Tensioner And Bore

Courtesy of BMW OF NORTH AMERICA, INC.

Secure belt tensioner with special tool 11 3 340.

NOTE: Illustration N42.

Fig 2: Identifying Special Tool (11 3 340) And Belt Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Remove drive belt (1) towards top.

Fig 3: Identifying Drive Belt And Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Installation:

Check that drive belt for is in correct installation position - risk of damage.