Checking and replacing the pulse generator of the ignition distributor sensor TSZi (BMW 3 Series E21)

Examination

Disconnect the wire connectors from the switch to the distributor sensor.

Connect a voltmeter with a division value of 0.1 V.

Start the engine with the starter: if the voltmeter shows at least 0.05 V, the pulse generator is working properly and the cause of the malfunction is the switch.

Replacement

Disconnect the pulse generator plug and remove the ignition distributor sensor.

Remove the vacuum regulator from the distributor sensor housing, having first unscrewed the mounting screws and moved the connecting rod downwards.

Remove the retaining ring and disc washer.

Insert two screwdrivers from opposite sides of the tabbed screen and carefully pry it out, being careful not to damage the mounting pin.

Remove the thrust washer, unscrew the three Allen head screws and remove the retaining ring.

Remove bracket 2 by unscrewing locking screw 1.

Disconnect shoe 3, then remove the carrier disk by unscrewing the locking screws.

Remove the pulse generator from the carrier disk.

Screw the new pulse generator onto the carrier disk, directing the generator's petal leads towards the cutout on the carrier disk.

Insert the carrier disk into the distributor sensor housing. Attach the shoe. Tighten the locking screw 1 of the bracket 2.

Install the retaining ring. Install the three Allen head cap screws. Install the thrust washer.

Install the screen with protrusions; in this case, the cutout on the screen should coincide with the groove on the drive shaft of the sensor-distributor.

Check the gap between the screen projections and the stator contacts of the pulse generator, which should be within 0.35-0.70 mm.





Install the disc washer and snap ring.

Install the vacuum regulator by connecting the connecting rod to the shaft of the distributor sensor, having previously lubricated it with engine oil.



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