12 31 020 Removing and installing or replacing alternator (N52K)

WARNING: This page is about a different variant/trim than selected.

IMPORTANT: Aluminium-magnesium materials.

No steel screws/bolts may be used due to the threat of electrochemical corrosion.

A magnesium crankcase requires aluminum screws/bolts exclusively.

Aluminum screws/bolts must be replaced each time they are released.

Aluminum screws/bolts are permitted with and without color coding (blue).

For reliable identification:

Aluminum screws/bolts are not magnetic.

Jointing torque and angle of rotation must be observed without fail (risk of damage).

Necessary preliminary tasks:

Unlock plug (1) and remove.

Slacken nut (2).

Installation:

Tightening torque 12 31 1AZ .

Disconnect battery positive lead from alternator.

Release screws (3) and remove alternator.

Installation:

Replace aluminum screws.

Tightening torque 12 31 2AZ .

Fig 1: Identifying Plug, Nut And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.