12 31... Replacing alternator belt pulley (with overrunning clutch)

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Special tools required

Remove and install alternator drive belt.

Grip alternator shaft with:

Release nut with special tools 12 7 120.

Installation:

Tightening torque 12 31 3AZ

Fig 1: Removing Nut Using Special Tool (12 7 120)

Courtesy of BMW OF NORTH AMERICA, INC.