12 31 020 Removing and installing or replacing alternator (N52, N52K, N51, N53)
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.