12 14 521 Replacing Crankshaft Pulse Generator (N51, N52, N52K, N53)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.

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 AIR INTAKE MANIFOLD (N52K) .

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.

Installation:

Replace sealing ring.

Fig 1: Locating Plug From Crankshaft Pulse Generator

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE:

Check stored fault messages.

Now clear the fault memory.