11 28 020 Replacing Tensioning Device For Alternator Drive Belt (N52)

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Special tools required:

For the following special tools, refer to ENGINE- SPECIAL TOOLS (N52K) .

11 3 340

IMPORTANT: Aluminum-magnesium materials. No steel screws/bolts may be used due to the threat of electrochemical corrosion. A magnesium crankcase requires aluminum screws/bolts exclusively. Aluminum screws/bolts must be replaced each time they are released . Aluminum screws/bolts are permitted with and without color coding (blue). For reliable identification: Aluminum screws/bolts are not magnetic . Jointing torque and angle of rotation must be observed without fail (risk of damage) .

Necessary preliminary tasks:

Remove drive belt . See 11 28 010 REPLACING ALTERNATOR DRIVE BELT (N52K) .

Remove special tool 11 3 340 .

Unscrew bolt (3).

Tightening torque. See 11 28 1AZ in 11 28 RIBBED V-BELT WITH TENSION AND DEFLECTION SYSTEM .

Installation:

Replace aluminum screws .

Fig 1: Belt Tensioner And Belt Tensioner Screw (E9x Only)

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.