Alternator: Service and Repair

12 31 020 - Removing and installing/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.
Aluminium screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminium screws/bolts are not magnetic.
Jointing torque and angle of rotation must be observed without fail (risk of damage).





Necessary preliminary tasks:
- Switch off ignition
- Disconnect battery negative lead Disconnecting and Connecting Battery Negative Lead
- Remove intake filter housing Service and Repair
- Remove alternator drive belt





Unlock plug (1) and remove.
Slacken nut (2).

Installation Note:
Tightening torque 12 31 1AZ [1][2]Specifications.

Release screws and remove alternator (3).

Installation Note:
Replace aluminium screws.
Tightening torque 12 31 2AZ [1][2]Specifications.