12 31... Replacing alternator belt pulley

Special Tools Required: 

• 12 7 110

Remove and install alternator drive belt.

Depending on alternator type, grip shaft with:

• Hexagon socket.
• Multi-tooth socket or,
• Torx socket wrench.

Release nut with special tool 12 7 110.

Fig 1: Releasing Nut Using Socket Wrench Socket WAF 24

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

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