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1231... Replacing alternator belt pulley (with overrunning clutch): Notes

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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: Releasing Nut With Special Tools (12 7 120)
G05476051Courtesy of BMW OF NORTH AMERICA, INC.