11 28 010 Replacing alternator drive belt (N51)

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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.

Layout of drive belt.

Fig 1: Drive Belt Tensioner, Mounting Screw And Removal Direction

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

Hold belt tensioner (4) under tension.

Fig 2: Belt Tensioner And Bore

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Secure belt tensioner with special tool 11 3 340.

NOTE: Illustration N42.

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

Courtesy of BMW OF NORTH AMERICA, INC.

Remove drive belt (1) towards top.

Fig 4: Identifying Belt Tensioner

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Assemble engine.

Installation:

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