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
  Fig 1: Identifying Special Tool (12 7 110)

  Courtesy of BMW OF NORTH AMERICA, INC.

Release nut with special tool 12 7 110.

Installation: 

For tightening torque refer to 12 31 2AZ / 12 31 3AZ in ALTERNATOR WITH DRIVE .