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12 31... Replacing alternator belt pulley

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Special tools required: 

Remove and install alternator drive belt.

Depending on alternator type, grip shaft with:

Release nut with special tool 12 7 110.

Installation: 

Tightening torque. Refer to 12 31 ALTERNATOR WITH DRIVE AND MOUNTING PARTS .

Fig 1: Releasing Nut With Special Tool
G03123599Courtesy of BMW OF NORTH AMERICA, INC.