12 31 020 Removing and installing or replacing alternator (N63)

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Necessary preliminary tasks:

Switch off ignition.
Disconnect BATTERY NEGATIVE LEAD .
Remove ACOUSTIC COVER .
Remove left and right INTAKE FILTER HOUSINGS .
Remove alternator DRIVE BELT .
Remove intercooler EXPANSION TANK .
Remove FUEL FEED 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 gaskets on turbocharger, replacing if necessary.

Fig 1: Identifying Charge-Air Ducts And Clamps

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 turbocharger.

Check seals on clean-air pipe, replacing if necessary.

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

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Pull off cable duct (1) from cable holder (2) in upward direction.

Release cable (3) from holder.

Fig 3: Pulling Off Cable Duct From Cable Holder

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Pull off plug (1).

Detach cover (2) and release nut underneath.

Tightening torque 12 42 1AZ .

Installation:

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

Disconnect battery positive lead (3) from alternator.

Remove FUEL FEED LINE (4).

Fig 4: Identifying Plug, Cover, Battery Positive Lead And Fuel Feed Line

Courtesy of BMW OF NORTH AMERICA, INC.

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

Place turbocharger coolant pump to one side. Do not remove turbocharger coolant pump.

Fig 5: Identifying Turbocharger Coolant Pump And Screws

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

Release screws (1).

Tightening torque 12 31 1AZ .

Fig 6: Identifying Turbocharger Coolant Pump Screws (Left Side)

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Remove alternator (1) together with bracket (2) in direction of travel.

Fig 7: Removing Alternator And Bracket

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NOTE: Check stored fault message.

Add final details to vehicle.

Now clear the fault memory.