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

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 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 12 41 STARTER MOTOR WITH MOUNTING

Remove battery positive lead (2).

Fig 1: Plug And Battery Positive Lead

Courtesy of BMW OF NORTH AMERICA, INC.

Release bolt (1).

Installation:

Replace aluminium screws.

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

Release screws (2).

Fig 2: Starter Motor

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace aluminium screws.

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

Remove starter motor (3).

Installation:

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