Features of removal and installation of the ignition distributor sensor (BMW 5 Series E12)

Removal

Don't forget to disconnect the wire between the proximity sensor and the connector that connects the ignition distributor sensor to the switch.

Make sure that the spring latches are not attracted by the permanent magnet.

Installation

Turn the ignition distributor rotor counterclockwise so as to maintain dimension "A" 3.5 cm to the mark on the distributor sensor body (see photo).





Insert the distributor into the bracket.

Set the ignition timing.

Replacing the contactless ignition distributor sensor

Remove the rotor and dust shield.

Remove the vacuum advance regulator.

Remove the mounting bracket 1 and carefully pull out the carrier disk in a straight line.

Turn the rotor so that its teeth coincide with the stator teeth and measure the gap "A" (see photo), which should be equal to 0.35-0.70 mm.



Remove retaining ring 2.

Remove spacer ring 3.

Carefully remove rotor 4 using two screwdrivers inserted from opposite sides, after first removing key 5.



Remove thrust washer 7.

Remove the three screws securing the proximity sensor bracket (shown by arrows in the photo).



Remove retaining ring 6.

Press the fastening brackets and remove the bracket with the contactless sensor.

Remove the proximity sensor from the bracket.

The installation of a new contactless sensor is carried out in the reverse order of removal, taking into account the following:

• direct the sensor petal leads towards the cutout on the carrier disk;
• when installing the rotor, align the cutout of its sleeve with the groove of the shaft;
• when installing the vacuum regulator, turn the stator to the left.

Checking the ignition distributor sensor

Check the resistance of the distributor rotor (see photo). The resistance of the rotor with the interference suppression resistor should be 5000 Ohms.



Check that the speed limiter is activated when the ignition current is shorted to ground 2 by regulator weight 1.