Alternator: Service and Repair

12 31 020 Removing and installing/replacing alternator (M57TU, M57T2)







Necessary preliminary tasks:
- Disconnect battery earth lead.
- Remove fan cowl.
- Remove drive belt from alternator.
- Remove pressure pipe.
- Remove front underbody protection.







Slacken nut (1).
Disconnect plug connection (2).

Installation note:
The positive power supply of the preheating control unit is also connected to terminal 30 of the alternator. This lines must be connected without fail, otherwise the preheating system will fail.







If fitted:
Remove cover (1).
Release screw underneath.
Tightening torque 12 31 2AZ.
Remove deflecting element (2).







Release screw (1).
Tightening torque 12 31 2AZ.
Remove deflecting element (2).
Release screws (3).
Tightening torque 12 31 1AZ.
Remove alternator (4).

Installation note:
If the Dynamic Drive optional extra is fitted, the alternator must be removed towards the bottom.


IMPORTANT: Risk of damage to the cooling system.







Installation note:
Check function of DDE.