12 31 020 Removing and installing or replacing alternator (N52, N52K, N51, N53)
WARNING: This page is about a different car, the 2010 BMW X3, 2009 BMW X3, 2008 BMW X3, and 2007 BMW X3. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Aluminium-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminium screws/bolts exclusively.
Aluminium screws/bolts must be replaced each time they are released.
The end faces of aluminium 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).
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminium screws/bolts exclusively.
Aluminium screws/bolts must be replaced each time they are released.
The end faces of aluminium 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 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD
- Remove intake filter housing
- Remove alternator drive belt
Unlock plug (1) and remove.
Slacken nut (2).
Installation:
Tightening torque 12 31 1AZ.
Release screws and remove alternator (3).
Installation:
Replace aluminium screws.
Tightening torque 12 31 2AZ.