12 41 020 Removing and installing/replacing starter motor (N52, N52K, N51, N53, N54)

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IMPORTANT: Aluminium-magnesium materials.

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

A magnesium crankcase requires aluminium screws/bolts exclusively.

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

The end faces of aluminium 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
Remove Intake Air Manifold

Unlock plug (1) and remove.

Unfasten nut.

For tightening torque refer to 3AZ in 12 41 STARTER MOTOR WITH MOUNTING .

Remove battery positive lead (2).

Fig 1: Identifying Battery Positive Lead, Nut And Plug

Courtesy of BMW OF NORTH AMERICA, INC.

Release bolt (1).

Installation:

Replace aluminium screws.

For tightening torque refer to 1AZ in 12 41 STARTER MOTOR WITH MOUNTING .

Release screws (2).

Installation:

Replace aluminium screws.

For tightening torque refer to 2AZ in 12 41 STARTER MOTOR WITH MOUNTING .

Remove starter motor (3).

Fig 2: Identifying Starter Motor, Bolt And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

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