12 31 020 Removing and installing or replacing alternator (N54, N54T, N55)

Necessary preliminary tasks:

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 air conditioning 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 .

Fig 1: Locating Bracket Bolts

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Unlock connector (1) and remove.

Remove protective cap and release nut underneath.

Tightening torque 12 42 1AZ .

Remove positive battery cable (2).

Fig 2: Identifying Positive Battery Cable And Connector

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws.

Remove bracket (1) and alternator (2).

Tightening torque 12 31 1AZ .

Fig 3: Locating Alternator Bracket Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.