12 31 020 Removing and installing or replacing alternator (N20)

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Necessary preliminary tasks:

Switch off ignition
Disconnect BATTERY EARTH LEAD and cover.
Remove INTAKE SILENCER HOUSING .
Remove CLEAN AIR PIPE , top.
Remove TENSIONING DEVICE for drive belt.

Release screws (1).

Tightening torque 12 31 1AZ .

Fig 1: Identifying Screws Of Alternator

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock connector (1) and remove.

Release nut (2) and remove the positive battery cable.

Tightening torque 12 42 1AZ .

Disconnect tank ventilation line (3) and place to one side.

Feed out alternator (4) to the left and remove.

Fig 2: Identifying Alternator Nut, Connector And Ventilation Line

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.