12 41 020 Removing And Installing/Replacing Starter (N51, N52, N52K, 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.

Aluminum screws/bolts are permitted with and without color coding (blue).

For reliable identification:

Aluminum screws/bolts are not magnetic .

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

Necessary preliminary tasks:

Switch off ignition
Clamp off battery negative lead . See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD (CONVERTIBLE) or 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD (COUPE) .
Remove intake air manifold . See 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (N51) .

Unlock plug (1) and remove.

Unfasten nut.

Tightening torque, see 12 41 3AZ in 12 41 STARTER MOTOR WITH MOUNTING .

Remove battery positive lead (2).

Fig 1: Removing Battery Positive Lead

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1).

Installation:

Replace aluminum screws .

Tightening torque, see 12 41 1AZ in 12 41 STARTER MOTOR WITH MOUNTING .

Release screws (2).

Installation:

Replace aluminum screws .

Tightening torque, see 12 41 2AZ in 12 41 STARTER MOTOR WITH MOUNTING .

Remove starter motor (3).

Fig 2: Identifying Starter Motor Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Check starter pinion and ring gear for damage. Replace starter if necessary.

N53 only: In the case of a separate term. 50 lead (with disconnector socket), the term. 50 lead is laid parallel to knock sensor 2 behind the fuel line.