12 31 ... Replacing alternator belt pulley

WARNING: This page is about a different car, the 2003 BMW Z8, 2002 BMW Z8, 2001 BMW Z8, and 2000 BMW Z8. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

12 7 110

Remove and install alternator drive belt.

Depending on alternator type, grip shaft with:

hexagon socket
multi-tooth socket or
Torx socket wrench

Release nut with special tool 12 7 110.

Fig 1: Removing Alternator Drive Belt

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Tightening torque, 12 31 2AZ / 12 31 3AZ. Refer to ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .