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Home >> BMW >> 2018 >> 320i xDrive >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Engine Electrical System - Repair - F30 >> Alternator With Drive And Mounting >> 12 31 020 Removing and installing/replacing alternator (N47 D16/20 K/U/O/T 1)

12 31 020 Removing and installing/replacing alternator (N47 D16/20 K/U/O/T 1)

Necessary preliminary tasks: 

Release connector (1) and remove.

Slacken nut (2).

Tightening torque: 12 52 2AZ .

Disconnect positive battery cable from alternator.

Fig 1: Identifying Connector And Nut
G09914198Courtesy of BMW OF NORTH AMERICA, INC.

Slacken nut (1).

Remove cover from deflecting element and undo bolt (1) beneath it.

Tightening torque: 12 31 2AZ .

Remove deflecting element.

Fig 2: Identifying Deflecting Element Bolt
G09914199Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque: 12 31 1AZ .

Feed out alternator upwards and remove.

Fig 3: Identifying Screws
G09914200Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Check stored fault messages.
Clear diagnostic fault entries from fault memory.