Crankshaft Position Sensor: Service and Repair

12 14 521 - Replacing crankshaft pulse generator (N52, N52K, N51, N53)





Important!
Read and comply with notes on protection against electrostatic damage (ESD protection) 61 35 ... Notes on ESD Protection (Electro Static Discharge).





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 colour 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:
- Read out fault memory of DME control unit
- Switch off ignition

Note:
Installation location of pulse generator for crankshaft is underneath starter motor.
Preparatory tasks:

- Remove intake air manifold Service and Repair





Detach plug (1) from crankshaft pulse generator (2).
Release screw.

Installation Note:
Replace aluminium screws.
Tightening torque 12 14 2AZ [1][2]Specifications.

Withdraw pulse generator (2) from crankcase.

Installation Note:
Replace sealing ring.





Note:
Check stored fault messages.
Now clear the fault memory.