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12 31... Replacing Alternator Belt Pulley

NOTE:

For Special Tool identification, see ENGINE ELECTRICAL SYSTEM - SPECIAL TOOLS .

Special Tools Required: 

Remove and install alternator drive belt.

Depending on alternator type, grip shaft with:

Release nut with special tool 12 7 110.

Installation: 

Tightening torque, refer to 12 31 2AZ/12 31 3AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .

Fig 1: Identifying Torx Socket Wrench
G03292181Courtesy of BMW OF NORTH AMERICA, INC.