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12 31 ... Replacing Alternator Belt Pulley

Special tools required: 

Remove and install alternator drive belt. See 11 28 010 REPLACING ALTERNATOR DRIVE BELT (N62/N62TU)

Depending on alternator type, grip shaft with:

Release nut with special tool 12 7 110. 

Installation: 

Tightening torque. See ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .

Fig 1: Identifying Special Tool (12 7 110)
G04740393Courtesy of BMW OF NORTH AMERICA, INC.