The ignition system is contactless. It consists of a distributor sensor, a switchboard, an ignition coil, spark plugs, additional resistance, an emergency vibrator, high and low voltage wires

Design feature of the ignition system UAZ-3151, -31512, -31514, -31519

The ignition distributor sensor (type 3706) is contactless, with a control pulse generator and built-in vacuum and centrifugal ignition advance regulators.

The distributor sensor performs two functions: sets the moment of sparking depending on the speed of rotation of the crankshaft, the load on the engine and distributes high voltage pulses through the spark plugs in accordance with the order of operation of the cylinders.

This is done by a slider mounted on the shaft of the distributor sensor.

There is an interference-suppressing resistor in the slider.

The switchboard (13.3734) opens the power supply circuit of the primary winding of the ignition coil, converting the control pulses of the sensor into current pulses in the ignition coil (B116).

Technical characteristics of the ignition system

The order of operation of cylinders 1-2-4-3

The direction against rotation of the rotor of the clock sensor-distributor of the arrow

Ignition advance angle, deg:

centrifugal regulator 15-18

vacuum regulator 8-10

Spark plugs A11 or A14M

Spark gap between candle electrodes, mm 0.85-1.0

Resistance of the slider, kOm 5-8

Tip resistance, kOm 4-7

Resistance of the central contact of the lid*, kOm 8-13

Resistance of the stator winding, kOm 0.4-0.45

* A carbon contact is installed on a part of the distributor sensors instead of a resistor.

The ignition coil is a high-voltage transformer. Primary winding — low voltage, secondary — high.

The windings are placed in a sealed metal housing filled with oil.

The emergency vibrator allows you to get to the repair site with a faulty switchboard or a damaged stator winding of the ignition distributor sensor.

To turn on the emergency vibrator, we connect the tip of the wire connected to the "short circuit" terminal of the switch to the contact terminal of the vibrator.

Switching the ignition system to emergency operation

To switch the ignition system to work with an emergency vibrator, turn off the ignition

Switching the ignition system to emergency operationSwitching the ignition system to emergency operation

Under the instrument panel on the right side with a flat screwdriver, unscrew the screw fixing the tip of the wire to the terminal "short circuit" of the switch

We attach the tip of the wire to the output of the vibrator and fasten it with a screw

Switching the ignition system to emergency operationSwitching the ignition system to emergency operation

In the engine compartment, we remove the hose from the valve fitting of the forced idle economizer

We remove the hose from the central fitting of the electromagnetic valve of the EPXX system

Switching the ignition system to emergency operation

We put this hose on the economizer valve fitting

Now the ignition system will work in emergency mode

The service life of the emergency vibrator is limited to 30 hours of operation

Therefore, as soon as possible, it is necessary to eliminate the malfunction of the ignition system: replace the switchboard or stator of the distributor sensor and put the system into operation.

To do this, connect the wire to the "short circuit" terminal of the switch and return the hoses of the EPXX system to their former places

After prolonged operation of the ignition system on the emergency vibrator, it is necessary to replace the vibrator with a new one

To replace the switch:

Disconnect the negative battery terminal

Marking the order of connecting the wires to the switch terminals

Design feature of the ignition system UAZ-3151, -31512, -31514, -31519

Unscrew with a screwdriver the three screws securing the wire tips to the switch terminals and disconnect the wires

UAZ-3151, -31512, -31514, -31519 Ignition system design featureUAZ-3151, -31512, -31514, -31519 Ignition system design feature

With a phillips screwdriver, unscrew the two mounting screws and remove the switch

Installing the switch in reverse order

Emergency vibrator replacement

If the vibrator was included in the ignition system, turn it off

UAZ-3151, -31512, -31514, -31519 Ignition system design featureUAZ-3151, -31512, -31514, -31519 Ignition system design feature

With a phillips screwdriver, unscrew the two screws securing the vibrator to the body and replace the emergency vibrator