12 31 020 Removing and Installing Or Replacing Alternator (N52K)

WARNING: This page is about a different car, the 2010 BMW X5, 2009 BMW X5, 2008 BMW X5, and 2007 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT:

Aluminum-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.

The end faces of aluminum screws/bolts are painted blue for the purposes of reliable identification.

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

Necessary preliminary tasks:

Switch off ignition.
Disconnect battery negative lead. See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD
Remove alternator drive belt. See 11 28 010 REPLACING ALTERNATOR DRIVE BELT (N52)

Unlock plug (1) and remove.

Slacken nut (2).

Installation:

Tightening torque 12 31 1AZ. See 12 31 ALTERNATOR WITH DRIVE AND MOUNTING PARTS

Release screws and remove alternator (3).

Fig 1: Identifying Alternator Plug And Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace aluminum screws.

Tightening torque 12 31 1AZ. See 12 31 ALTERNATOR WITH DRIVE AND MOUNTING PARTS

Fig 2: Identifying Alternator Guide Pulley

Courtesy of BMW OF NORTH AMERICA, INC.