Alternator: Service and Repair

12 31 020 Removing And Installing Or Replacing Alternator (N54, N54T, N55)







Necessary preliminary tasks:
- Switch off ignition.
- Disconnect battery earth lead.
- Remove charge air duct.
- Remove alternator drive belt.







NOTE: In order to remove the alternator, it is necessary to remove the air-conditioning compressor for the air conditioning system.

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.







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.







Unlock connector (1) and remove.
Remove protective cap and release nut underneath.
Tightening torque 12 42 1AZ.
Remove positive battery cable (2).







Release screws.
Remove bracket (1) and alternator (2).
Tightening torque 12 31 1AZ.







Assemble engine.

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