11 28 020 Replacing alternator drive belt tensioner (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 Drive Belt.

Remove special tool 11 3 340.

Release screw (3).

For tightening torque refer to 11 28 1AZ in 28 V-RIBBED BELT WITH TENSION AND DEFLECTION ELEMENT .

Installation:

Replace aluminium screws.

Fig 1: Identifying Belt Tensioner, Screw And Belt Drive

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.