12 31... Replacing Alternator Belt Pulley (With Overrunning Clutch)
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2010 BMW M6, 2010 BMW M5, 2009 BMW M6, 2009 BMW M5, and 2008 BMW M6. However, it is still accessible from the selected car via links, so may be relevant.
Remove and install alternator drive belt. Grip alternator shaft with: - internal serration
Release nut with special tools 12 7 120. Installation: Tightening torque, see 12 31 3AZ in 11 31 CAMSHAFT .