12 31 020 Removing and installing or replacing alternator (230i and 230i xDrive coupe/convertible)

Necessary preliminary tasks: 

• Disconnect BATTERY NEGATIVE LEAD .
• Remove THROTTLE VALVE ASSEMBLY .
• Remove DRIVE BELT FOR ALTERNATOR .

In so doing:

• Do not  draw off air conditioning refrigerant.
• Do not  detach refrigerant lines from A/C compressor.
• Do not remove air conditioning compressor; instead, release from bracket only and place to one side.

Removal: 

Slacken nut (1).

Feed out positive battery cable (2) and place to one side.

Unlock and disconnect plugs (3).

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Release screw (1).

Loosen the alternator (2).

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Remove the alternator (1) towards the front in the direction of the arrow.

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Remove the alternator (1) towards the top in the direction of the arrow.

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Preparation for installation: 

Loosen the screws along the arrows.

Remove the tensioning device for the drive belt (1).

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Insert and install the tensioning device for the drive belt (1) on the new alternator.

Tighten the screws along the arrows.

Tightening torque 12 31 2AZ .

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Press back the threaded support sleeve (2) in the direction of the arrow to facilitate installing the alternator.

Screw in screw (1) into the threaded support sleeve (2). Turn back the threaded support sleeve (2) in the direction of the arrow using the screw (1).

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

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Installation: 

Insert the alternator (1) in the direction of the arrow.

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Insert the alternator (1) in the direction of the arrow.

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Install alternator (2).

Tighten down screws (1).

Tightening torque 12 31 1AZ .

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Connect the positive battery cable (2) to the alternator.

Tighten nut (1).

Tightening torque 12 42 1AZ .

Attach connector (3).

Connector (3) must engage audibly.

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Required reworking: 

• Install the AIR CONDITIONING COMPRESSOR .
• Install DRIVE BELT FOR ALTERNATOR .
• Install THROTTLE BODY .
• Connect BATTERY EARTH LEAD .