12 31... Replacing alternator belt pulley

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Special tools required:

12 7 110

Remove and install alternator drive belt.

Fig 1: Removing Alternator Drive Belt

Courtesy of BMW OF NORTH AMERICA, INC.

Depending on alternator type, grip shaft with:

hexagon socket
multi-tooth socket or
Torx socket wrench

Release nut with special tool 12 7 110.

Installation:

Tightening torque, 12 31 2AZ / 12 31 3AZ. Refer to ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .