The ignition system - battery, non-contact - consists of an ignition coil, a switch, an ignition distribution sensor, spark plugs, candle tips, low and high voltage wires. The scheme of the ignition system is shown in the diagram of the electrical equipment of cars
Ignition system specifications
Ignition order 1—2—4—3
Distribution sensor type.....19.3706
Alternation of sparks, deg.....After 90±1
The direction of rotation of the sensor-distributor roller (from the slider side).....Counterclockwise
Spark plugs..... А14ВР
The gap between the electrodes of the candles, mm.....0.8-0.95
Candle tip.....50.3707200 or 402.37707230
Resistor resistance in the tip 4-7 kOhm
The ignition coil is a transformer, on the iron core of which the secondary is wound, and on top of its primary winding. The core with windings is installed in a sealed steel case filled with oil and closed with a high-voltage plastic cover.
Ignition coil maintenance
To protect against possible breakdown of the plastic cover, the ignition coil must be cleaned of dirt, dust and oil, and the high and low voltage wires must be checked for reliability.
Checking the state of the coil
In the coil, malfunctions most often appear due to its overheating and operation with increased spark plug gaps.
Before removing the ignition coil for replacement, make sure that the wires are connected to the coil terminals in good condition and securely.
The coil should be checked on a special stand model K-295.
A serviceable coil must ensure uninterrupted sparking on a three-electrode needle-shaped spark gap with a spark gap of 7 mm at a frequency of 2500 min -1 of the sensor-distributor roller, at least.
If uninterrupted sparking is not ensured due to breakdown of the coil insulation, interturn short circuit, chips and cracks in the plastic cover, burnout of the cover, depressurization of the housing and oil leakage, the coil should be replaced.
Sensor-distributor of ignition
The sensor-distributor is a combination of a magnetoelectric sensor and a distributor of high voltage impulses.
The distributor shaft is driven by the oil pump drive gear.
The centrifugal ignition timing controller automatically changes the ignition timing depending on the speed of the distributor shaft.
Vacuum ignition timing adjuster automatically adjusts ignition timing based on engine load. The parameters of these regulators are shown in the table below.
Manual adjustment (when installing the ignition) is carried out by turning the distributor sensor in the drive housing. To turn it is necessary to release the bolt of the sensor-distributor.
Turning the distributor housing by one division of the scale corresponds to a change in the advance angle by 2° (according to the angle of rotation of the crankshaft).
Maintenance of the distribution sensor
Properly and timely preventive measures prevent the occurrence of malfunctions and increase the service life of the distribution sensor.
At each TO-2, it is necessary to remove the high-voltage cover and the distributor sensor slider and put 4-5 drops of engine oil on the filter (to lubricate the moving parts of the rotor).
It is necessary to monitor the fastening of the distribution sensor.
If the sensor-distributor turns by hand, then it should be fixed, having previously checked the correctness of the initial ignition angle; if necessary, set the starting angle.
The cover of the sensor-distributor must be thoroughly wiped outside and inside with a cloth soaked in clean gasoline.
Carefully check for cracks or traces of spark breakdown and significant burning or corrosion of the electrodes of the cover and the current-carrying plate of the slider in the cover and slider.
Burning of the end surfaces of the current-carrying plate of the slider and the electrodes of the cover indicates an excessively large radial gap between the current-carrying plate and the electrodes.
In this case, the cover or slider must be replaced.
If the cover or slider does not show signs of damage, carefully wipe the burnt places on the electrodes of the cover and the slider plate with a cloth slightly moistened with gasoline.
It is impossible to clean the indicated places with a file. This leads to an increase in the gaps between the current-carrying plate of the slider and the electrodes of the cover and, in the future, to breakdown of the cover or slider.
High voltage wires The connections must be firmly inserted into the terminals of the cover until they stop.
Burning and erosion on the inner surface of the sockets of the cover indicate that the wire is installed without fixation.
If the wire is weakly held in the socket, you must first slightly part the petals of the spring tip of the wire and insert it into the socket until it stops.
The occurrence of an additional spark gap in the high voltage circuit due to the installation of high voltage wires in the terminals of the cover without fixing usually leads to burning out of the plastic of the cover and its subsequent failure.
If necessary, the distribution sensor can be checked on a special stand model K295 or K297.
If a stand is not available, check the centrifugal governor for binding. This can be done most simply by checking whether the slider easily returns to its original position if it is turned by hand relative to the stationary roller, and then released.
The sensor-distributor with a faulty centrifugal regulator must be repaired or replaced.
The regulator is adjusted by changing the tension of the springs of the weights by bending the racks on which they are fixed.
The small spring of the centrifugal governor (weaker) must have a preload in the initial state, which is ensured by the position of the spring rack.
Table: Variation of ignition timing by centrifugal and air regulators
Changing the ignition timing
centrifugal and air regulators
Roller lead angle
Vacuum, mm Hg Art.
Roller lead angle
distribution sensor, deg
Distributor sensor repair
Repair of the distributor sensor consists in replacing worn or defective parts with a mandatory after that adjustment
Disassembly of the sensor-distributor
Remove the distributor cap
1. We unscrew the three screws.
2. We extend the insulator from the groove of the housing
3. We take out the stator.
4. After unscrewing the two screws, remove the vacuum regulator.
5. We unscrew the two screws of the stator support.
6. We mark the relative position of the rotor and the clutch on the roller.
Removing the filter
7. Holding the roller by the drive clutch from turning, unscrew the screw.
8. Remove the rotor from the roller
9. Remove the stator support assembly with the bearing.
10. Prying with a screwdriver, remove the spring ring.
11. With a beard we push the pin out of the roller hole
12. Having removed the clutch with washers, we take out the roller assembly with the centrifugal regulator
Before assembling the distributor sensor, lubricate the roller and its bearings with CIATIM-201 or No. 158 grease, apply 1–2 drops of engine oil to the filter.
We assemble the sensor in the following order: install the roller and the stator support into the sensor housing.
We put the vacuum regulator rod on the support pin. We install the stator and, making sure that the regulator rod has not come off the pin,
we wrap two screws securing the stator. Further assembly is carried out in the reverse order of disassembly. Check that the marks on the rotor and the coupling match, if necessary, turn the coupling on the roller by 180°.
Checking the status of parts
The lid and slider must be thoroughly wiped periodically. Especially carefully wipe the sockets of the terminals of the high-voltage wires of the cover.
The terminals inside the cover and the current carrying plate must be wiped without the use of any tool, as this may increase the gap in the high-voltage circuit, which is unacceptable.
The cover and slider with cracks and burnouts must be replaced.
Check whether the central contact of the cover moves freely. The slider should fit tightly on the rotor.
Check for a flat spring in the slider seat.
Inspect the inside of the stator.
On the poles of the magnetic circuit there should be no traces of touching the poles of the rotor.
Check the resistance of the stator winding, which should be 400-450 Ohm, as well as the integrity of the wire connecting the stator output to the sensor output.
Inspect the outer surface of the rotor magnetic circuit. In the poles of the magnetic circuit there should be no traces of touching the stator.
Check the radial play of the rotor on the roller, which should be no more than 0.2 mm.
If there is wear on the roller or rotor, replace it.
Check the bearings for lack of eating. If there is play in the bearing, it must be replaced.
If necessary, rinse the bearing and fill 2/3 of the volume with CIATIM-221 grease. Check the condition of the conductor connecting the support to the body.
Check for wear on the coupling pin. If worn, the clutch must be replaced. Check axle weights for binding.
If there is a radial play of the roller above 0.2 mm, it is necessary to replace the bronze-graphite bushings.
The diameters of the roller should be between 12.70.2 and 8.5 mm, and their runout relative to each other should not exceed 0.01 mm.
If wear exceeds the specified tolerances, the roller should be replaced.
Press out worn bushings and press in new ones. After pressing, expand them to a diameter of 12.7 mm.
The distribution sensor is assembled in the reverse order of disassembly. Before assembly, it is necessary to lubricate all working surfaces of parts (roller, bearing, etc.) with CIATIM-221 grease.
When assembling, it is necessary to adjust the longitudinal play of the roller and rotor within 0.05-0.2 mm using shims.
Afterwards, the sensor must be checked on the stand K295 or similar.
The vacuum regulator is not adjustable. The centrifugal regulator is adjusted by bending the spring legs.
With the engine not running, the ignition timing at the end of compression in the first cylinder should be 5° before TDC.
To install the ignition you need:
- remove the cover of the sensor-distributor;
- unscrew the spark plug of the first cylinder;
- close the hole for the candle of the first cylinder with your finger;
- turn the crankshaft of the engine until the air starts to escape from under the finger. This will happen at the beginning of the compression stroke;
- making sure that the compression has begun, carefully turning the engine shaft, set the ignition timing to 5 °. Moreover, the second mark on the damper part of the crankshaft pulley should be opposite the indicator rib of the timing gear cover.
- loosen the bolt securing the octane corrector to the drive and turn the distributor sensor housing to set the octane corrector pointer to the middle position of the scale and tighten the bolt;
- loosen the bolt securing the octane corrector to the housing of the sensor-distributor;
- press the slider with your finger against its rotation (to eliminate gaps in the drive) and slowly turn the body until the red mark on the rotor aligns with the arrow on the stator of the distributor sensor;
- tighten the bolt securing the octane corrector plate to the distributor sensor housing and install the distributor sensor cover in place;
The procedure for connecting wires to the spark plugs from the ignition distributor sensor: A - in front of the car - install high-voltage wires in the distributor sensor cover in accordance with the operating order of cylinders 1-2-4-3 (Fig. 15)
After installing the ignition, check the accuracy of the ignition setting by listening to the engine while driving.
To do this, warm up the engine to 60-90 ° C, moving in direct gear on a flat road at a speed of 30-40 km / h, give the car acceleration, sharply, to failure, by pressing the throttle pedal. If at the same time a slight and short-term detonation is heard, the ignition timing is set correctly.
In case of strong detonation, turn the housing of the distribution sensor by one division of the octane corrector scale counterclockwise (each division of the scale corresponds to a rotation of the crankshaft by an angle of 4 °).
In the absence of detonation, turn the distributor sensor housing one division clockwise, after adjusting the ignition timing, check its correctness by listening to the engine while the car is moving.
Adjust the ignition so that only slight detonation is heard when the engine is under heavy load.
Early ignition, when strong detonation is heard, the head gasket can be pierced and burn out the valves and pistons.
When ignition is delayed, fuel consumption rises sharply and the engine overheats. Use a stroboscope to set the ignition more accurately.
For this you need:
- connect the strobe sensor-distributor to the high voltage wire of the spark plug of the first cylinder;
- start and warm up the engine;
- check the engine and, if necessary, adjust the idle speed within 550-650 rpm;
- turn on the stroboscope and direct it to the pointer rib on the timing gear cover, while the pointer rib and three fixed marks on the crankshaft damper pulley should be visible.
When the ignition is correctly installed, there should be a zone between the The first and second marks of the damper pulley.
If the position of the pointer rib and marks does not correspond to the specified one, it is necessary to loosen the bolt securing the distributor sensor to the drive housing and, with the engine running and the strobe turned on, turn the distributor sensor housing to the optimal position of the pointer rib and marks. Tighten the bolt.
It is strictly forbidden to leave high-voltage wires with lugs not sent to the sockets of the sensor-distributor cover to the stop, as this will lead to burnout of the cover.
The switch is designed to amplify the signals of the distribution sensor and control the current of the ignition coil in the primary circuit.
The functionality of the switch can be checked on the bench model K295 or K297. In the absence of a stand, you can check the switch on the car.