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Home >> BMW >> 2004 >> X3 2.5i (E83) L6-2.5L (M54) >> Repair and Diagnosis >> Starting and Charging >> Charging System >> Alternator >> Service and Repair
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Alternator: Service and Repair




12 31 020 - Removing and installing or replacing alternator (M54)





Necessary preliminary tasks:
- Check stored fault messages.
- Switch off ignition.
- Observe instructions for disconnecting and connecting Instructions for Disconnecting and Connecting Battery battery.
- Disconnect battery ground wire and mask it.
- Remove suction filter housing Service and Repair.
- Remove alternator drive belt Replacing Alternator Drive Belt (M52/S52/M52TU/M54/M56).





Unlock and detach plug connection (1).
Release nut (2) and remove battery positive lead.
Tightening torque 12 31 1AZ [1][2]Specifications.





Remove cover from idler pulley (1).
Release screw and remove idler pulley (1).
Release screw and remove alternator (2).





Installation:
Turning lock of tensioning roller must engage in alternator groove.





Note:
Read out fault memory of DME control unit.
Now clear the fault memory.
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