12 31... Replacing alternator belt pulley

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 BMW 328xi, 2012 BMW 328i, 2011 BMW 328xi, 2011 BMW 328i, and 2010 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

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 .

Installation:

TIGHTENING TORQUE, 12 31 2AZ/12 31 3AZ .

Fig 1: Releasing Alternator Drive Belt Nut Using Special Tool (12 7 110)

Courtesy of BMW OF NORTH AMERICA, INC.

Necessary preliminary tasks:

Remove drive belt.

Illustrations show N42:

If fitted, remove cover cap from belt pulley.

Depending on alternator type, slacken screw with:

Torx key
Hold inner multi-wrench tool (special tool 12 7 122 ).

Release freewheel with special tool 12 7 121 and remove.

Installation note:

Tightening torque 12 31 8AZ .

Fig 1: Holding Freewheel Using Special Tool 12 7 121

Courtesy of BMW OF NORTH AMERICA, INC.