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.
• Torx socket wrench.

Fig 1: Releasing Drive Belt Nut With Special Tool 12 7 110

Courtesy of BMW OF NORTH AMERICA, INC.

Release nut with special tool 12 7 110.

Installation: 

Tightening torque for pulley (45 N.m.).

Tightening torque for pulley with ribbed drive belt, (80 N.m.).