12 31 020 Removing and installing or replacing alternator (B48, B46)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2019 MINI Cooper, 2018 MINI Cooper, 2017 MINI Cooper, 2016 MINI Cooper, and 2015 MINI Cooper. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Disconnect BATTERY NEGATIVE LEAD .
Remove CROSS CONNECTION .
Remove FAN COWL .
Remove SERVOMOTOR FOR ECCENTRIC SHAFT .
Remove INTAKE PLENUM .
Loosen DRIVE BELT FOR ALTERNATORdo not remove.

Removal:

Release expansion rivet (1).

Release screw (2).

Remove partition wall (3).

Fig 1: Expansion Rivet, Partition Wall And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock connector (1) and pull off.

Release nut (2) and remove positive battery cable from alternator.

Fig 2: Alternator Connector And Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1) on bottom of alternator.

NOTE: Screw (1) cannot be removed. The screw (1) is to be removed along with the alternator.

Fig 3: Alternator Screw (Bottom)

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1) on top of alternator.

Fig 4: Alternator Screw (Top)

Courtesy of BMW OF NORTH AMERICA, INC.

Feed out alternator along with the screw (1) on the bottom of the alternator through the slot on the support and remove.

Fig 5: Screw On Bottom Of Alternator

Courtesy of BMW OF NORTH AMERICA, INC.

Preparation for installation:

Slightly push back the threaded support sleeve (2) in order to facilitate the installation of the alternator.

Screw in screw (1) into the threaded support sleeve (2). Push back the threaded support sleeve (2) with the aid of the screw (1).

Unscrew the screw (1) from the threaded support sleeve (2) again.

Fig 6: Threaded Support Sleeve And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Insert the screw (1) into the alternator before installing the alternator.

Fig 7: Alternator Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Feed in the alternator with the screws through the slot (1) on the support and install.

Join both screws.

Fig 8: Screw On Bottom Of Alternator

Courtesy of BMW OF NORTH AMERICA, INC.

Tighten screw (1).

Tightening torque 12 31 1AZ .

Fig 9: Alternator Screw (Bottom)

Courtesy of BMW OF NORTH AMERICA, INC.

Tighten screw (1).

Tightening torque 12 31 1AZ .

Fig 10: Alternator Screw (Top)

Courtesy of BMW OF NORTH AMERICA, INC.

Attach connector (1).

Connector (1) must engage audibly.

Connect positive battery cable to alternator.

Tighten nut (2).

Tightening torque 12 52 2AZ .

Fig 11: Alternator Connector And Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Position partition wall (3).

Tighten screw (2).

Attach expanding rivet (1).

Fig 12: Expansion Rivet, Partition Wall And Screw

Courtesy of BMW OF NORTH AMERICA, INC.