12 41 020 Removing and installing/replacing starter

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.

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

For reliable identification:

Aluminium 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
Disconnect BATTERY NEGATIVE LEAD
Remove INTAKE AIR MANIFOLD

Unlock plug (1) and remove.

Unfasten nut.

Tightening torque 12 41 3AZ .

Remove battery positive lead (2).

Fig 1: Identifying Plug And Battery Positive Lead With Nut

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Release screw (1).

Installation:

Replace aluminium screws.

Tightening torque 12 41 1AZ .

Release screws (2).

Fig 2: Identifying Starter Motor And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace aluminium screws.

Tightening torque 12 41 2AZ .

Remove starter motor (3).

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.