12 41 020 Removing and Installing/Replacing Starter (N52, N52K, N51, N53, N54)

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IMPORTANT:

Aluminum-magnesium materials.

No steel screws/bolts may be used due to the threat of electrochemical corrosion.

A magnesium crankcase requires aluminum screws/bolts exclusively.

Aluminum screws/bolts must be replaced each time they are released .

The end faces of aluminum screws/bolts are painted blue for the purposes of reliable identification.

Jointing torque and angle of rotation must be observed without fail (risk of damage) .

Necessary preliminary tasks:

Switch off ignition
Disconnect battery negative lead (See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD and/or 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD )
Remove intake air manifold

Unlock plug (1) and remove.

Unfasten nut.

Tightening torque 12 41 3AZ, see ENGINE ELECTRICAL SYSTEM -- TORQUE SPECIFICATIONS -- TWIN TURBO .

Remove battery positive lead (2).

Fig 1: Locating Battery Positive Lead

Courtesy of BMW OF NORTH AMERICA, INC.

Release bolt (1).

Installation:

Replace aluminum screws.

Tightening torque 12 41 1AZ, see ENGINE ELECTRICAL SYSTEM -- TORQUE SPECIFICATIONS -- TWIN TURBO .

Release screws (2).

Installation:

Replace aluminum screws.

Tightening torque 12 41 2AZ, see ENGINE ELECTRICAL SYSTEM -- TORQUE SPECIFICATIONS -- TWIN TURBO .

Remove starter motor (3).

Fig 2: Identifying Starter Motor

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Check starter pinion and ring gear for damage, replace starter motor if necessary.