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

WARNING: This page is about a different car, the 2011 BMW M3, 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. 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 using Special Tool 12 7 120.

Installation:

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

Courtesy of BMW OF NORTH AMERICA, INC.