11 28 010 Replacing alternator drive belt (N52K)

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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 .

Aluminium screws/bolts are permitted with and without color coding (blue).

For reliable identification:

Aluminium screws/bolts are not magnetic .

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

Necessary preliminary tasks:

Remove Fan Cowl with electric fan

NOTE: Mark the direction of rotation of the drive belt if it is to be reused.

Course of E9x drive belt:

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

Hold belt tensioner (4) under tension.

Load is removed from tensioning pulley.

Fig 1: Belt Tensioner And Bore

Courtesy of BMW OF NORTH AMERICA, INC.

Course of E85 drive belt:

Turn belt tensioner (1) in direction of arrow until bore is flush on housing.

Hold belt tensioner (1) under tension.

Load is removed from tensioning pulley (2).

Fig 2: Belt Tensioner And Tensioning Pulley

Courtesy of BMW OF NORTH AMERICA, INC.

All:

Secure belt tensioner (1) with special tool 11 3 340.

Remove drive belt upwards.

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

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Installation:

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