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

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.

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:

NOTE: Installation location of pulse generator for crankshaft is underneath starter motor.

Preparatory tasks:

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

Release screw.

Installation:

Replace aluminium screws.

For tightening torque refer to 12 14 2AZ in 12 14 ELECTRONIC SHIFT UNITS OR CONTROL UNITS .

Withdraw pulse generator (2) from crankcase.

Installation:

Replace sealing ring.

Fig 1: Identifying Plug, Screw And Crankshaft Pulse Generator

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check stored fault messages.

Now clear the fault memory.