Alternator: Service and Repair

12 31 020 - Removing and installing/replacing alternator (N54)





Necessary preliminary tasks:
- Switch off ignition
- Clamp off battery negative lead Disconnecting and Connecting Battery Negative Lead and cover.
- Remove charge air duct. Removing and Installing/Replacing Rear Left Charge-Air Duct (N54)
- Remove alternator drive belt Service and Repair.





Note:
In order to remove the alternator, it is necessary to remove the A/C compressor.
In so doing:
- Do not draw off A/C system refrigerant.
- Do not detach refrigerant lines from A/C compressor.
- Do not remove A/C compressor; instead, remove from bracket only and place to one side.
Remove A/C compressor from bracket Service and Repair.





Note:
For purposes of improved clarity, illustrations and description show A/C compressor removed.

Release bolts a few turns until bracket (1) is loose. Do not remove bracket (1).

Tightening torque 64 52 5AZ Specifications.
E70/E71 only:
Tightening torque 64 52 5AZ.





Unlock plug (1) and remove.
Remove protective cap and release nut underneath.
Tightening torque 12 42 1AZ 12 42 Alternator Lead.
Disconnect line (2).





Release screws.
Remove bracket (1) and alternator (2).
Tightening torque 12 31 1AZ 12 31 Alternator with Drive and Mounting Parts.