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

WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. 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:

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

Courtesy of BMW OF NORTH AMERICA, INC.