12 41 020 Removing and installing/replacing starter motor (N52, N52K, N51, N53)
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 lead61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD
- Remove 61 INTAKE MANIFOLD
Unlock plug (1) and remove.
Unfasten nut.
For tightening torque refer to 12 41 3AZ in 12 41 STARTER MOTOR WITH MOUNTING .
Remove battery positive lead (2).
Release screw (1).
Installation:
Replace aluminium screws.
For tightening torque refer to 12 41 1AZ in 12 41 STARTER MOTOR WITH MOUNTING .
Release screws (2).
Installation:
Replace aluminium screws.
For tightening torque refer to 12 41 2AZ in 12 41 STARTER MOTOR WITH MOUNTING .
Remove starter motor (3).
Installation:
Check starter pinion and ring gear for damage, replace starter motor if necessary.