12 31 ... Replacing alternator belt pulley (with overrunning clutch)

Special tools required: 

• 12 7 120

Remove and install alternator drive belt.

Grip alternator shaft with:

• internal serration

Release nut with special tools 12 7 120.

Installation: 

For tightening torque refer to 12 31 3AZ in 12 31 ALTERNATOR WITH DRIVE AND MOUNTING PARTS .

Fig 1: Special Tools (12 7 122) And (12 7 121)

Courtesy of BMW OF NORTH AMERICA, INC.