What is a distributor?

1, the distributor

2. Body

by a gasoline engine ignition system periodically cylinder firing order to spread the high voltage spark plug of each cylinder member (see Figure). In battery ignition systems, the distributor and typically do breaker on the same axis, by a valve driven by the camshaft. It also has adjusting means and the ignition timing capacitor. Off breaker contact arm spring piece using closed off cam with the contacts open, opening a gap of about 0.30 to 0.45 mm. The number of cam projections off the same number of cylinders. When the contacts open, the distributor arm is precisely aligned with a respective distributor-side electrode, a high voltage induced by the secondary coil through the distributor arm-side electrode, the high pressure transmitted to the respective cylinder spark plug lead. When different octane gasoline can be adjusted manually First set ignition advance angle. When the engine speed increases, the centrifugal ignition timing of the ignition advance angle adjusting means, and vice versa after the ignition delay. When the engine load decreases, the degree of vacuum in the intake manifold to increase, through a connecting pipe to a vacuum being ignition advance angle adjusting means, the ignition advance. Such adjustment ensures the engine operation at the appropriate ignition timing. In the magneto ignition system, like breakers typically done in the magneto form a whole.

3, with FIG.

distributor

4, the video

5 common faults and maintenance

OftenNext, pull out the central high-voltage, high-pressure distributor will no flashover from occurring at the cylinder 5 ~ 7mm.
[Faulty]
① low-voltage circuit breaker.
② capacitors or short-circuit breaker contact fault.
③ ignition coil is burnt.
④ central high-voltage circuit, high voltage receptacle center or excessive drain receptacle within the oxide.
[Troubleshooting]
① ignition is turned on, the engine is started, the ammeter swings between 3 ~ 5A, but no fire engine signs, the central high-voltage is the high voltage coil or the ignition coil of an electrical fault, capacitor leakage or failure, if no current or a current meter no change, the table is called the low-voltage circuit breaker.
② electrical ignition switch is turned on, the movable contact breaker lap joint column with the test light (at this time should distributor cap is removed, so that the breaker contacts open), if the lights, electrical contact is broken open fault point, should crank crank observed distributor shaft cam edges can open the breaker contacts at the top. If the breaker contacts can not open the top, the gap adjustment described improper circuit breaker; such as to open the top, continue to check the contact condition and the breaker contact gap face.
③ If the light is not on, check whether the capacitor is short-circuit breakdown. If the capacitor is normal, with continued lap test lamp ignition coil primary coil of the next column. If the lights, it is checked whether there is an open failure of the primary coil; if it is a bright line between the positive power to the ignition switch or open circuit fault has.

extending through

Function distributor of low voltage current is switched on and off, and the high-voltage current of the ignition coil to a spark plug distributions to each cylinder. A breaker distributor, distributor, ignition advance accommodating electrical devices and other components.
and used to adjust the distributor are:
(1) a pair of circuit breaker contacts and the cam composition. Cam and integrally distributor shaft, the cam rotates, the cam lobe contacts a top opening, the low-pressure circuit is broken, the cam lobe is rotated, the contact under the action of the spring, low pressure circuit has been turned on, the number of cam lobes to be the same as the number of cylinders of the engine. Two revolutions of the crankshaft revolutions, a turn cam distributor, ignition time for each cylinder.
(2) with a predetermined electrical firing order assigned to each cylinder of the high-voltage ignition. It consists of cap and distributor rotor distributor.
the distributor rotor shaft driven by the distributor, high voltage throughAttempting to excessive conductive cover electrode, the spark plug was transferred to a high pressure conductor.
(3) receiving electrical spark action is weakened separate breaker contacts and enhance secondary voltage.
(4) The distributor assembly of various components distributor assembly should be cleaned.
1) housing sleeve lubrication, along with the pellet distributor shaft assembly and spacer inserted into the housing, the shaft and the bushing clearance is generally 0.02-0.07mm. Lubrication of the cam and the base plate aperture and mounted on the shaft, the adjustment of the distributor shaft longitudinal gap, the gap is generally 0.08-0.25mm.
The locking ring and the spring mat attached to the distributor shaft center concave holes, and add a few drops of oil.
2) mounted breaker and the fixed plate assembly, the cam arm against the contact dielectric block. Adjusting breaker contact gap, the gap is generally 0.35-0.45mm.
The method of adjusting the fixed contact breaker is rotatable eccentric screw bracket, and the two contacts of the coaxial error should be less than 0.1mm.
3) distributor shaft should not have a radial gap, the method checks the rotating cam and the shaft, the contact in a closed state, and then pushes the cam axis in the direction of the insulating block the arms off, if the contact is open, i.e., It represents a radial clearance.
4) mounted trailing end of the distributor shaft gear (or coupling), and secured with pins or screws.
receiving electrical installation, the distributor rotor shaft mounted in the distributor, and the breaker in the open position. Check whether the distributor rotor electrode collector electrode cap aligned points. Installation vacuum regulator.

6, repair

Step 1, to check whether the low-voltage circuit is faulty. The specific method is: when the ignition switch is turned on, 25V DC with a multimeter range measuring ignition coil “+” is the voltage and the column voltage firing pin 4, an electronic component, which is a normal 12V; electrical signal and then disconnect the wiring harness points, multimeter with positive and negative bars were connected to both ends of two joints, where the normal voltage is 10.5V; ignition voltage is then measured between the electronic component 5 and the No. 2 pin pin, which is normal 10.5V, without this voltage value, the electronic ignition assembly might be describedmalfunction.

Step 2, to check whether the high-voltage ignition coil and a central normal. The specific method is: first with a multimeter 10Ω range measuring resistance primary winding of the ignition coil, which is normal for 0.6-0.7Ω; 10kΩ range measuring multimeter then a secondary winding of the ignition coil resistance, which is a normal value 2.5-3.5kΩ; and then measuring the center high-voltage resistance, which is a normal value 0-2.8kΩ. If no such normal resistance, then there may be an internal DUT failure repair is to be noted as appropriate.

Step 3. If after the above measurement were normal, indicating means and said internal power supply line is normal, as it can be re-installed after the inspection is normal ignition electronics assembly. At this time, the first switch off the ignition, with a multimeter (allocated to 25V DC gear) connected to the ignition coil bar table n “+” is a column, then the ignition coil negative gauge bar “-” next column, and then disconnect the electrical wiring harness sub signal , then turn the ignition switch, then a change should pay close attention meter pointer. Normal, indicating voltage meter pointer to about 10.5V, and then quickly dropped to 0. May be when the ignition switch is turned on, the signal points unplug electrical harness, in which a wire connected indirectly at the head, immediately after this grounding wire quickly released the electronic component to an analog to fire an ignition signal, At this meter pointer should also have the above-described reaction. If the above reaction, prove that the ignition electronics assembly without failure. Then if the car is still launch vain, then the fault in the ignition signal generator. Only replace the spark ignition signal generator and electronic components fail, no repair.

check ignition electronic component and an ignition signal generator, it may be practiced without multimeter measurement, the central high-voltage method after the plug of a spark plug Ground test fire. If the spark-over can be seen in the momentary ignition switch is turned ON or the case where the ignition switch rapidly to ground and the signal line can be seen immediately upon release of the spark, the ignition electronics assembly described and were normal ignition signal generator, otherwise ignition electronic ignition components or signal generator is faulty.