12 31 020 Removing and Installing Or Replacing Alternator (N52K)
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).
Installation:
Replace aluminum screws.
Tightening torque 12 31 1AZ. See 12 31 ALTERNATOR WITH DRIVE AND MOUNTING PARTS