12 31... Replacing alternator belt pulley

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.

Installation: 

TIGHTENING TORQUE, 12 31 2AZ/12 31 3AZ .

Fig 1: Removing Belt Pulley Mounting Nut Using Special Tool (12 7 110)

Courtesy of BMW OF NORTH AMERICA, INC.