12 31 020 Removing and installing/replacing alternator (N47 D20 O1)

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Necessary preliminary work:

Read out the fault memory of the DDE control unit.
Switch off ignition.
Disconnect BATTERY EARTH LEAD .
Remove INTAKE FILTER HOUSING .
Remove INTAKE PORT .
Remove THROTTLE BODY .
Remove INTAKE PLENUM .
REMOVE drive belt for alternator.

Release connector (1) and remove.

Slacken nut (2).

Tightening torque 12 52 2AZ .

Disconnect positive battery cable from alternator.

Fig 1: Identifying Connector And Slacken Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Slacken nut (1).

Remove cover from idler pulley and undo bolt (1) beneath it.

Tightening torque 12 31 2AZ .

Remove idler pulley.

Fig 2: Identifying Deflecting Element Bolt

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque 12 31 1AZ .

Feed out alternator upwards and remove.

Fig 3: Identifying Screws Of Alternator

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NOTE: Check stored fault messages.
Delete fault memory.