12 14 521 Replacing Crankshaft Pulse Generator (N51, N52, N52K, 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) (CONVERTIBLE) or 61 35... NOTES ON ESD PROTECTION (ELECTRO STATIC DISCHARGE) (COUPE) .

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 .

Aluminum screws/bolts are permitted with and without color coding (blue).

For reliable identification: Aluminum 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 . See 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (N51) .

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

Release screw.

Installation:

Replace aluminum screws .

Tightening torque, see 12 14 2AZ in 12 14 ELECTRONIC SHIFT UNITS OR CONTROL UNITS .

Withdraw pulse generator (2) from crankcase.

Fig 1: Detaching Plug From Crankshaft Pulse Generator

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace sealing ring.

NOTE:

Check stored fault messages.

Now clear the fault memory.