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. See ENGINE - TIGHTENING TORQUES .

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

Courtesy of BMW OF NORTH AMERICA, INC.