12 41 020 Removing and Installing/Replacing Starter Motor (N52, N52K, N51, N53, N54)
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.
The end faces of aluminum 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. See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD
- Remove intake air manifold. See 11 61 050 REMOVING AND INSTALLING AIR INTAKE MANIFOLD (N52)
Unlock plug (1) and remove.
Unfasten nut.
Tightening torque 12 14 3AZ. See 12 41 STARTER MOTOR WITH MOUNTING
Remove battery positive lead (2).
Release screws (1).
Installation:
Replace aluminum screws.
Tightening torque 12 14 1AZ. See 12 14 ELECTRONIC SHIFT UNITS OR CONTROL UNITS
Release screws (2).
Replace aluminum 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.
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.