The non-contact ignition system (Fig. 1) includes devices:
- – distribution sensor;
- – transistor switch;
- – additional resistance;
- – emergency vibrator;
- – spark plugs.
Fig. 1. Scheme of a contactless ignition system
The device of the sensor-distributor is shown in fig. 2.
The distribution sensor has a housing, a cover, a roller, a sinusoidal voltage sensor, centrifugal and vacuum regulators, as well as an octane corrector.
The centrifugal governor automatically changes the ignition timing depending on the speed.
The voltage sensor consists of a rotor and a stator.
The rotor is an annular permanent magnet with four-pole clips tightly pressed to it from above and below, rigidly fixed to the sleeve.
In the upper part of the rotor, a slider is installed on the bushing.
The stator of the sensor is a winding enclosed in four-pole plates.
The stator has an insulated stranded lead connected to the sensor lead.
The second output of the winding is electrically connected to the housing in the assembled sensor-distributor.
There is a mark on the rotor, an arrow on the stator, which serve to set the initial moment of sparking.
Ignition coil (fig. 3)
Resistance of windings at a temperature of (25±10) °С, Ohm:
- secondary.....13 000–13 400
Developed secondary voltage maximum, V.....30 000
The coil has a high voltage output and two low voltage outputs:
- – terminal K – for connection with terminal K of additional resistance;
- - unmarked output - with switch output K3.
Additional resistance (Fig. 3)
The value of active resistance between the terminals "+" and "C" (0.71 ± 0.05) Ohm, between the terminals "C" and "K" - (0.52 ± 0.05) Ohm.
Transistor switch (Fig. 3, 4)
Fig. 4. Electrical circuit diagram of a transistor switch
The switch consists of a case and a board with radio elements.
The switch outputs are intended for:
- - output D - for connection with the low-voltage output of the distribution sensor;
- - short circuit output - for connection with the output of the ignition coil;
- – output "+" - for connection with the output "+" of additional resistance or fuse box.
Emergency vibrator (Fig. 1)
It consists of a body and a board on which all the vibrator nodes are mounted. Has one output.
Turning it into operation is allowed only in case of failure of the transistor switch or the sensor stator coil.
After 8,000 km
Check the tightness of the nuts of the low-voltage connector of the distribution sensor, the fastening of the connecting wires.
After 16,000 km
Check the ignition distributor: inspect the slider, the distributor cap and, if they are dirty, wipe them with a cotton cloth soaked in clean gasoline.
Lubricate the rotor hub with a dropper (4-5 drops) (previously remove the slider and the felt under it).
After 50,000 km
Thoroughly rinse the ball bearing of the stator support with clean gasoline, put Litol-24 grease into it no more than 2/3 of the free volume of the bearing (preliminarily remove the cover, slider, rotor and stator support).
To prevent surface overlap and burnout of the cover of the sensor-distributor, make sure that high-voltage wires with lugs are sent into the sockets of the cover until they stop.
You can not turn on the ignition and the presence of moisture on the lid. Keep plastic parts clean (cover, slider, low voltage terminal, etc.).
Ignition timing setting procedure
- 1. Set the piston of the first cylinder at the top dead center of the compression stroke in the first cylinder until the M3 hole (5 ° to TDC) on the crankshaft pulley coincides with the pin on the timing gear cover.
- 2. Remove the plastic cover from the sensor-distributor.
Make sure that the runner electrode is installed against the terminal on the cover of the distribution sensor marked with the number "1" (terminal for the ignition wire of the spark plug of the first cylinder of the engine).
- 3. Tighten the octane-corrector plate of the distributor sensor with a bolt with a pointer inserted into it to the drive housing so that the pointer coincides with the average division of the octane-corrector scale.
- 4. Loosen the bolt securing the octane corrector plate to the distributor sensor housing.
- 5. Holding the slider with your finger against its rotation (to eliminate gaps in the drive), carefully turn the housing until the red mark on the rotor and the tip of the petal on the stator are aligned in one line.
Fix the octane corrector plate with a bolt on the distributor sensor housing.
- 6. Install the cover of the distributor sensor, check the correct installation of the ignition wires to the candles in accordance with the order of operation of the engine cylinders 1-2-4-3, counting counterclockwise.
After each ignition setting, check the accuracy of the ignition timing by listening to the operation of the engine while driving.
To do this, warm up the engine to a temperature of 80 ° C and, moving in direct gear on a flat road at a speed of 40 km / h, let the car accelerate by sharply pressing the throttle pedal.
If at the same time a slight short-term detonation is observed up to a speed of 55-60 km / h, then the ignition timing is set correctly.
In case of strong detonation, turn the distributor sensor housing (Fig. 5) on the octane corrector scale by 0.5–1.0 divisions counterclockwise.
Each division of the scale corresponds to a change in ignition timing of 4 °, counting along the crankshaft.
In the complete absence of detonation, it is necessary to increase the ignition timing by turning the distributor sensor housing clockwise.