12 14 521 Replacing Crankshaft Pulse Generator (N52, N52K, N51, N53)
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IMPORTANT:
Read and comply with notes on protection against electrostatic damage (ESD protection). See 61 35... NOTES ON ESD PROTECTION (ELECTRO STATIC DISCHARGE)
IMPORTANT:
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:
- 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. See 11 61 050 REMOVING AND INSTALLING AIR INTAKE MANIFOLD (N52K)
Detach plug (1) from crankshaft pulse generator (2).
Release screw.
Installation
Replace aluminum screws.
Tightening torque 12 14 2AZ. See 12 14 ELECTRONIC SHIFT UNITS OR CONTROL UNITS .
Withdraw pulse generator (2) from crankcase.
Installation:
Replace sealing ring.
NOTE:
Check stored fault messages. Now clear the fault memory.