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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:

Fig 1: Installing Alternator Drive Belt
G04740393Courtesy of BMW OF NORTH AMERICA, INC.

Release nut with special tool 12 7 110.

Installation: 

Tightening torque, 12 31 2AZ / 12 31 3AZ  , see 12 31 ALTERNATOR WITH DRIVE AND MOUNTING PARTS .