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 Clamps And Charge-Air Ducts

G09875411

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 Hoses, Screw And Clean Air Pipe

G09875412

Courtesy of BMW OF NORTH AMERICA, INC.

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

Release cable (3) from holder.

Fig 3: Pulling Off Cable Duct

G09875413

Courtesy of BMW OF NORTH AMERICA, INC.

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, And Battery Positive Lead

G09875414

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 Screws On Turbocharger Coolant Pump

G09875415

Courtesy of BMW OF NORTH AMERICA, INC.

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

Release screws (1).

Tightening torque 12 31 1AZ .

Fig 6: Identifying Screws

G09875416

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 7: Removing Alternator

G09875417

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check stored fault message.
Add final details to vehicle.
Now clear the fault memory.