12 31... Replacing alternator belt pulley: Procedure

Remove and install alternator drive belt.

Depending on alternator type, grip shaft with:

• Hexagon Socket
• Multi-Tooth Socket
• Torx Socket Wrench

Release nut with special tool 12 7 110.

Installation: 

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

Fig 1: Removing Alternator Drive Belt

Courtesy of BMW OF NORTH AMERICA, INC.