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

WARNING: This page is about a different car, the 2016 BMW Z4, 2015 BMW Z4, and 2014 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Switch off ignition.
Disconnect BATTERY EARTH LEAD and cover.
Remove INTAKE SILENCER HOUSING .
Release CHARGE-AIR DUCT at front, do not remove.
Remove DRIVE BELT for alternator.

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.

Fig 1: Locating Alternator Bracket Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

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

Tightening torque 64 52 3AZ .

Fig 2: Identifying Alternator Connector, Protective Cap And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock connector (1) and remove.

Remove protective cap (2) and release nut underneath.

Tightening torque 12 42 1AZ .

Remove battery positive lead.

Release screws (3).

Tightening torque 12 31 1AZ .

Tightening torque 12 31 2AZ .

Remove alternator.

Assemble engine.