12 31 020 Removing and installing or replacing the alternator (N63 B40/B44 O 1)

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Necessary preliminary tasks:

Switch off ignition.
Disconnect BATTERY NEGATIVE LEAD .
Remove acoustic cover . See 11 00 REMOVING AND INSTALLING/REPLACING THE ACOUSTIC COVER (N63 B44 O 0/1) or 11 00 REMOVING AND INSTALLING/REPLACING ACOUSTIC COVER (N63)
Remove left and right INTAKE FILTER HOUSINGS .
Remove alternator DRIVE BELT .
REMOVE CHARGE AIR COOLER EXPANSION TANK .
PARTIALLY DISENGAGE THE FUEL DELIVERY LINE .

IMPORTANT: Risk of damage!
Cover radiator.

Release clamps (1).

Tightening torque 13 71 8AZ .

Release clamps (2).

Replace clamps (2).

Detach both charge-air ducts (3) and remove.

Check the gaskets on the exhaust turbocharger. replacing if necessary.

Fig 1: Identifying Charge-Air Ducts And Clamps

G06178876

Courtesy of BMW OF NORTH AMERICA, INC.

Picture shows the left side, the procedure for the right side is identical.

Detach hoses (1) from clean air pipe.

Release screw (2).

Tightening torque 13 71 1AZ .

Detach clean-air pipe (3) in direction of travel from exhaust turbocharger.

Check the gaskets on the clean air pipe. replacing if necessary.

Fig 2: Identifying Clean-Air Pipe, Hoses And Screw

G06178877

Courtesy of BMW OF NORTH AMERICA, INC.

Disengage all the lines and connectors (1) from the alternator holder and put them to the side.

Fig 3: Identifying Lines And Connectors

G09875420

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock and pull off connector (1) from alternator.

Release nut at bottom of cover (2).

Tightening torque 12 41 1AZ .

Remove positive battery cable from alternator and place to one side.

Installation note:

Reinstall cover (2) without fail risk of short circuiting!

Fig 4: Identifying Alternator Connector And Cover

G09875421

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1) on turbocharger coolant pump (2).

Place the turbocharger coolant pump to the side. Do not remove the turbocharger coolant pump!

Fig 5: Identifying Turbocharger Coolant Pump And Screws

G06178880

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque 12 31 1AZ .

Feed out and remove the alternator together with the holder in the direction of travel.

Fig 6: Identifying Screws Of Alternator

G09875423

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check stored fault message.
Reassemble the vehicle.
Delete fault memory.