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: 

Tightening torque 12 31 3AZ .

Fig 1: Identifying Special Tool (12 7 121) And (12 7 122)

Courtesy of BMW OF NORTH AMERICA, INC.