Installing contactless ignition on a UAZ 469. instructions for installing and setting up the ignition on a UAZ. review of SZ on famous UAZ

Ignition system UAZ 469

To start the engine of any vehicle, it is necessary that the combustible mixture ignites at the right moment in the combustion chamber. Effective operation of the piston system is achieved by correctly setting all parameters. The UAZ 469 ignition system allows you to operate the vehicle regardless of climate, temperature, humidity and other external factors.

The ignition of the UAZ 469 ensures that all elements are in good working order and flawlessly perform their assigned functions. For UAZ 469, the ignition circuit consists of the following components:

• ignition coil UAZ 469;
• distributor;
• tourniquets;
• switch;
• candles.

Each individual component of the electrical circuit must not allow breakdown to the car body and current leakage.

The ignition of a UAZ 469 car includes the following elements:

1. battery;
2. mass button;
3. voltage regulator relay;
4. generator;
5. ammeter;
6. ignition switch UAZ 469;
7. breaker-distributor contacts;
8. distributor;
9. capacitor;
10. ignition distributor-distributor cover;
11. slider;
12. spark plug;
13. high voltage wire;
14. additional resistance;
15. additional starter relay;
16. ignition coil;
17. starter.

The ignition order of the UAZ 469 is strictly regulated; the spark occurs exactly in the specified sequence. An important point is not only the timeliness of the spark supply, but also its size. If the slightest interruption occurs, the entire chain is reconfigured.

A car battery is not designed to produce sufficient current and voltage required to ignite a combustible mixture. The charging current is only capable of spinning the engine flywheel for a short time. For stable operation of the engine, the entire ignition system of the vehicle must begin to fully function.

This important component of the machine is designed to significantly increase the power characteristics of the battery. Proper ignition, together with the battery, sends the spark plugs the sufficient volume and current required to reliably ignite the fuel mixture.

Period from 1965 to 1984

hi-electric.com Hall sensor: how to connect, check or replace, where it is located, principle of operation, signs of malfunction, linear or analog, dual-circuit ignition. Electronic ignition with hall sensor During this period, the automaker equipped its products with electrical components available to the domestic industry. Some of them were known for a long time, others were experimental, as evidenced by videos from previous years, and which had to prove their suitability.

Connection diagram for headlights on UAZ 452 first editions

Lighting control

In particular, the controls and a number of main units migrated from its predecessor, the GAZ-69. Thanks to this, the price of the car remained the same.

On models of the first years of production, a foot light switch was installed, which had several operating modes:

1. The first position activated the circuit for switching the low beam headlights and side lights;
2. In the second position, the low and high beam headlight circuit was activated.

Foot switch for headlights and parking lights

The modernized light switch has a different operating algorithm:

1. The first position supplies power to the side lights only;
2. The second position is side lights and low (high) beam headlights.

The most correct option is to replace the old switch with a modern one, which uses only 3 contact groups.

Also, on older versions of the “452” there was no alarm, so in the electrical diagram:

1. An RS-57 breaker relay was installed (mounted in the wiring gap from the “+” terminal of the battery to the direction indicator switch);
2. The middle contact of the relay closed the indicator light on the instrument panel.

Ignition system

Ignition of UAZ 452 model 1968

Also on the “452” contact ignition was installed:

1. The “+” wire from the battery supplied power to the ignition coil;
2. From the coil, the high-voltage wire transmitted the impulse to the breaker (distributor) and further to the spark plugs.

Period from 1985 to 2013

In later modifications, with the advent of injection, some changes were made to the ignition:

1. An additional resistance was installed in the “battery-ignition coil” circuit;
2. A separate wire from the starter was laid to the coil wire connection terminal (past the additional resistance)
3. On later models, an additional starter relay was installed in the circuit.

Control devices UAZ 452

Conclusions: along with the car, the electrical circuit also changed. This factor should be taken into account when carrying out scheduled repair work in order to eliminate emergency situations.

Operating principle of the ignition system

Ensuring and maintaining timely ignition of the air-fuel mixture for the efficient functioning of the internal combustion engine is the main task of ignition. This occurs in strict accordance with the established operating order of the engine cylinders. An ignition coil 16 is connected in series to the electrical circuit along with an additional resistance 14. It is automatically closed when the engine is started by the starter.

This significantly increases the breaking current of the primary circuit. Ignition coil 16 creates high-frequency pulses in the vehicle's on-board electrical system. High voltage flashes create a breakdown of the spark gap in the spark plugs 12, screwed into the top point of each cylinder, where the working fuel mixture is compressed.

The coil consists of primary and secondary windings. The primary winding is wound on top of the secondary. Inside the coil there is a core and a ring magnetic circuit. Both of these elements are made of special electrical steel. Reliable sealing of the coil is carried out by a carbonite cover in a casing with a rubber gasket.

Transformer oil is poured into the casing for cooling. This material significantly increases the insulation of the windings and effectively removes heat from the coil body. To avoid damage to the coil and its overheating, it is not recommended to leave the ignition on in a car when the engine is not running.

Distributor 8 distributes high voltage pulses to all cylinders of the internal combustion engine strictly in the established sequence. The distributor or breaker-distributor is installed in a standard place to the left of the engine cylinder block. The mechanism is driven by the oil pump roller. The roller rotates counterclockwise from the lid side.

Characteristics of the 417 UAZ engine

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The basis for the power plant of the UAZ 417 was the 414 engine, which was produced before. In comparison with its predecessor, the unit received a new cylinder head and an increased compression ratio. As for the gas distribution, a new camshaft and intake valves have appeared (the cross-section has become larger). The head of the core received a rounded profile of the outlet channels for the mixture formation mechanism with two chambers.

417 UAZ engine characteristics:

UAZ-469:

The power plant has some features that are not typical for engines of this type, features include:

• Sealing of the sleeves in the frame with rubber rather than copper rings;
• The first motors were produced without stiffeners, later 4 ribs appeared;
• Supply and intake of cooling fluid from the core head;
• Combined exhaust manifold;
• Dome-shaped combustion chamber.

How to set the ignition correctly

In order to set the ignition on the UAZ 469, you must adhere to the following recommendations:

• Remove the distributor cover with the rotor. Check the size of the gap between the contacts. It can be adjusted. Between the contacts, separated as much as possible, there should be a gap of 0.35 - 0.45 mm. Adjustment is best done with a set of feeler gauges. Too small a gap produces a weak spark. If the gap is large, there may be no spark at all. Having made a normal gap, the rotor can be installed in its normal place.
• Using a spark plug wrench, unscrew the spark plug of the first cylinder. Close the candle hole with your finger. Using the starting handle, turn the crankshaft until the pin is pushed out by compressed air. This moment is called the beginning of the compression stroke of the first cylinder.
• Continue turning the crank until the hole on the pulley and the pin on the timing gear cover align. The rotor should be located opposite the internal contact of the cover, connected to the high-voltage wire from the spark plug of the first cylinder.
• Rotate the octane corrector plate together with the distributor so that the mark coincides with the middle mark on the scale of the plate.
• Lightly turn the timing mechanism housing counterclockwise. Scroll until the contacts of the distributor close.
• Connect the control light with socket. Connect one contact to the low voltage terminal of the distributor, the second to the ground of the machine. You can connect the warning lamp to the car body.
• Turn on the ignition and carefully turn the distributor clockwise. Rotate until the indicator light comes on, then stop rotating. It may be that the lamp does not light up. Repeat all steps from the very beginning.
• Tighten the distributor mounting bolt. Place the cover with the central wire in place. Check the adjustment starting from the first cylinder. The check is carried out counterclockwise.

Coil device

Underwater ignition on a jeep

The UAZ 469 ignition coil has a complex design:

• screw-in terminal with high voltage;
• voltage output;
• lid;
• contact spring;
• low voltage clamp;
• gasket for sealing;
• fastening bracket;
• magnetic circuits;
• contact plate;
• primary and secondary winding;
• insulation gaskets;
• frame;
• insulator;
• iron core;
• insulating mass;
• additional resistor and its insulator;
• screw and plate for fastening the resistor.

The distributor performs the function of distributing and interrupting the ignition of the UAZ 469. It has vacuum and centrifugal regulators. The centrifugal changes the ignition angle of the UAZ depending on the frequency with which the crankshaft or camshaft rotates.

BSZ spark plugs are a very important element. With their help, the working mixture in the combustion chamber in the cylinders ignites and gives a good spark so that the car starts quickly. Most often they use A12BS spark plugs, which cannot be disassembled, so in case of a malfunction you need to have new ones in stock that can be quickly and easily replaced.

Wires for high voltage are made from PVL-1 wire. They connect the coil to the distributor, and the distributor to the spark plugs. The spark plugs are attached to the central electrode using special tips with resistors.

Why turn on the ignition?

With the ignition set correctly:

• The engine operates efficiently, steadily and stably in all modes. Otherwise, the engine functions intermittently, knocking, and popping. Unstable engine operation causes many problems and reduces vehicle dynamics and speed characteristics.
• After correct ignition adjustment, starting a cold power unit is significantly improved.
• When the ignition is misregulated, fuel consumption increases. After adjustment it decreases significantly.
• Engine power also increases noticeably in a car after proper ignition adjustment.

Specifications

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The ZMZ 409 Euro 3 engine has increased technical characteristics compared to its older brother. Thus, the power unit, due to the fact that it was designed on the basis of the 406, received high technical characteristics and endurance. Let's consider the main technical characteristics of the motor:

In addition to the Euro 3 standard, there are a number of modifications that are worth considering:

1. ZMZ 409.10 is the main motor, meets the Euro-2 environmental standard. Power 143 hp
2. ZMZ 40904.10 - analogue of 409.10 with a new CPG, new gaskets, DBP, complies with the Euro-3 environmental standard. Power 128 hp Installed on Patriot, Hunter, Pickup, Cargo.
3. ZMZ 40905.10 - analogue of 40904.10, compliance with the Euro-4 environmental standard. Power 128 hp Installed on Patriot, Hunter, Pickup, Cargo.
4. ZMZ 4091.10 - derated low-end version of ZMZ 40904.10, another receiver, camshafts (lift 8, phase 240), firmware, complies with Euro-3 environmental standard. Used on UAZ loaves. Power 112 hp
5. ZMZ 40911.10 is an analogue of ZMZ 4091.10, DBP, meets the Euro-4 environmental standard. Used on UAZ loaves. Power 112 hp
6. ZMZ 4092.10 is a non-serial motor. Power 160 hp Used on the Volga.

What are the ignition systems on the UAZ 469

Contact ignition on UAZ 469

. Now it is recognized as obsolete. However, domestic manufacturers continue to use it. The system launches a pulse of a certain power. This impulse comes from the ignition distributor. The contact ignition circuit of the UAZ 469 is simple and uncomplicated. This is its advantage. The driver can fix any malfunction and make adjustments with his own hands. The prices of components are low.

Transistor or contactless ignition of UAZ 469

. Contactless ignition systems are installed on many types of vehicles. It has a number of advantages over the contact design. The spark produced by such a device is much more powerful. This occurs due to an increased level of electrical voltage in the secondary winding of the ignition coil. The transistor ignition system is equipped with an electromagnetic mechanism. It ensures stable, constant operation of the entire system, uninterruptedly transferring energy to components, parts, and mechanisms. Correctly configured ignition with an efficient internal combustion engine guarantees high power and significant fuel savings. Long-term reliable performance is ensured by compliance with the frequency of maintenance of the distributor drive. It must be lubricated and adjusted every 10,000 km. The difficulty of repair is a disadvantage of the contactless ignition system. It cannot be repaired independently, since this requires special diagnostic equipment, available only in service centers and service stations.

Electronic ignition on UAZ 469

. This type of ignition is the most technologically advanced, but at the same time expensive. Modern car models are equipped with similar devices. It has complex technology that provides not only high torque, but also a number of other engine indicators. Advantages: simple adjustment of the advance angle, no mandatory check of contacts for oxidation. In engines equipped with electronic spark protection, the fuel mixture burns 100%. Repairs must be carried out only at a service station.

Underwater ignition on UAZ 469

. This is a sealed ignition system, in which there is no fear of flooding with water, falling into deep holes, or driving in open areas during snow and rain. When the ignition is normal - contact or non-contact, 50% of the spark power is actually lost inside the distributor, between the cover and the runner. Let's find out why this happens.

There is a small gap between the electrical contacts, which are the distributor cap and the slider. To pass electrical energy through this space, most of the additional current is expended. With contact ignition, for these purposes, another part of the energy is spent on the functioning of the cam.

The underwater ignition is designed in such a way that the spark from the coil directly hits the spark plug. Carrying out this process, it does not lose its main power, except for the resistance of high-voltage wires. Here the loss of power is quite insignificant, so it can be ignored.

It is worth noting that on most foreign-made cars, a coil is placed separately on each cylinder, which is located immediately on the spark plug, and the loss is accordingly quite insignificant.

Source

Operating principle of the ignition system

Ensuring that the fuel-air mixture ignites at the correct time for efficient operation of an internal combustion engine is the primary task of ignition. This occurs in strict accordance with the predetermined operating sequence of the engine cylinders. The ignition coil 16 is connected in series with an additional resistor 14 in an electrical circuit. It closes automatically when the engine is started by the starter.

This leads to a significant increase in the breakdown current of the primary circuit. Ignition coil 16 generates high-frequency pulses in the vehicle's on-board electrical system. Flashes of high voltage interrupt the spark on the spark plugs 12, screwed into the top of each cylinder, where the working fuel mixture is compressed.

The coil consists of a primary winding and a secondary winding. The primary winding is wound onto the secondary. This is how the UAZ 469 ignition system works. Inside the coil there is a core and a ring magnetic circuit. Both of these components are made of special electrical steel. The reel is closed with a carbonite cover in a housing with a rubber seal.

Transformer oil is poured into the cover for cooling. This material significantly increases the winding insulation and effectively removes heat from the coil body. To avoid damage to the coil and overheating, it is not recommended to leave the ignition on when the engine is off.

Distributor 8 distributes high-voltage pulses to all cylinders of the internal combustion engine strictly sequentially. The distributor or breaker-distributor is installed in a standard location on the left side of the engine cylinder block. This mechanism is driven by the oil pump shaft. From the cover side, the shaft rotates counterclockwise.

What kind of ignition system is there for UAZ 469?

Contact ignition on the UAZ 469, which is now considered obsolete. However, domestic manufacturers still use it. The system delivers a pulse of a certain power. This pulse appears in the ignition distributor. The contact ignition circuit of the UAZ 469 is simple and straightforward. This is its advantage. The driver can fix any malfunction and make adjustments with his own hands. Prices for components are low.

Transistor or contactless ignition system in the UAZ 469. The contactless ignition system is installed on many types of cars. It has a number of advantages compared to the contact design. The spark created by such a device is much stronger. This occurs due to an increased level of electrical voltage in the secondary winding of the ignition coil. The transistor ignition system is equipped with an electromagnetic mechanism. It ensures stable, continuous operation of the entire system, smoothly transferring energy to components, parts and mechanisms. Correctly adjusted ignition with a working internal combustion engine guarantees high power and significant fuel savings. Long-lasting and reliable operation is ensured by following the drum motor's maintenance intervals. It should be lubricated and adjusted every 10,000 km. The disadvantage of a contactless ignition system is the difficulty of repair. It cannot be repaired yourself, since this requires specialized diagnostic equipment, available only at service centers and stations.

Electronic ignition system of the UAZ 469. This type of ignition is the most technologically advanced, but at the same time it is not cheap. Modern car models are equipped with such devices. It has advanced technology that provides not only high torque, but also a number of other engine parameters. Advantages: easy adjustment of the advance angle, no need to check contacts for oxidation. In engines equipped with electronic power take-off, the fuel mixture burns up to 100%. Repairs may only be carried out at a service station.

Underwater ignition on the UAZ 469 This is a sealed ignition system that is not afraid of being flooded with water, falling into deep holes, or driving in the open air during snow and rain. With normal ignition - contact or non-contact - 50% of the spark power is lost inside the barrel, between the cap and the guide. Let's find out why this happens.

There is a small space between the electrical contacts, which are the distributor cap and the guide. The flow of electricity in this space absorbs most of the additional current. In the case of contact ignition, an additional part of the energy is spent for this purpose due to the operation of the cam.

The underwater ignition is designed in such a way that the spark from the coil goes directly to the spark plug. During this process, it does not lose its main power, except for the resistance of the high-voltage wires. The power losses here are very small, so they can be neglected.

It is worth noting that in most foreign-made cars, a coil is installed separately for each cylinder, which is located directly on the spark plug, and the losses, accordingly, are quite insignificant.

FakeHeader

Comments 17

The wiring diagram does not correctly indicate the wires from the switch to the ignition coil. Additional resistance is installed if you use a 13.3734 commutator, otherwise the ignition coil or the commutator itself will heat up.

which wire should I remove?

there is 1 wire +, the second one comes from the capacitor, and you remove the third one!

Tell me, what is the additional resistance for? but it's not in your diagram

resistance is installed to make the engine start more logically, but I didn’t install it, and it starts just fine. As they say, half a kick. And they put it on the lawn (53), but I didn’t feel the difference.

I also installed the motor from the Volga, but the old commutator remained, the UAZ one removed the resistance and hooked it up according to your diagram, but for some reason the coil gets very hot

resistance is installed to make the engine start more logically, but I didn’t install it, and it starts just fine. As they say, half a kick. And they put it on the lawn (53), but I didn’t feel the difference.

I drove for about 15 minutes, the coil got very hot and after 10 minutes it didn’t start anymore, in the end I installed the original switch that was on the Volga, it started right away, but I didn’t have time to check the coil and whether it was heating up or not. couple, just whether the coil should heat up so much, what’s the matter, I can’t understand, I thought it might be due to resistance

Many UAZ owners know about the vagaries of classic ignition, which sometimes presents unpleasant moments. And often craftsmen find ways to modernize a problematic unit or an entire system. And one such method of improving the launch system with your own hands will be discussed in this publication.

In the photo, UAZ 31514 is a reliable all-terrain vehicle for many purposes.

Why turn on the ignition?

Connection diagram for ignition system components

In order to properly configure and adjust the engine cylinders on a UAZ-469 vehicle, you must have certain skills. We will talk about them later, but first we invite you to find out for what purposes it is necessary to correctly adjust contactless ignition and what this may entail. After connecting the key to the ignition switch, numerous components and mechanisms are activated, without which the operation of the engine is impossible.

So why set this parameter:

1. The engine will operate optimally and stably in all modes. Otherwise, its operation will be unstable and cause inconvenience to drivers.
2. Cold engine starting will be significantly improved. Of course, if you want trouble-free starting of the engine in thirty-degree frost, you must also fill the engine with the correct oil and check the suitability of the spark plugs.
3. Fuel consumption is normalized, otherwise it may be increased.
4. The drive power will be optimal, as indicated in the service book (the author of the video is the Smotri Vidik channel).

How to set the ignition correctly

To install the ignition in a UAZ 469 car, you must follow the following recommendations:

• Remove the drum cover with the rotor. Check the gap between the contacts. It can be adjusted. There should be a gap of 0.35 - 0.45 mm between the contacts at maximum expansion. It is best to make adjustments using a set of measuring sensors. Too small a gap produces a weak spark. If the gap is too large, there may be no spark at all. If the clearance is normal, the rotor can be installed in its normal position.
• Using a spark plug wrench, remove the spark plug of the first cylinder. Cover the spark plug hole with your finger. Use the crank to turn the crankshaft until compressed air pushes the pin out. This moment is called the beginning of the compression stroke of the first cylinder.
• Continue turning the crank until the hole on the pulley and the pin on the camshaft cover line up. The rotor should be located against the internal contact on the cover, connected to the high voltage wire from the spark plug of the first cylinder.
• Rotate the octane corrector plate together with the drum so that the mark coincides with the center mark on the scale of the plate.
• Turn the distributor body slightly counterclockwise. Turn until the drum contacts close.
• Connect the indicator light to the connector. Connect one terminal to the low voltage terminal of the tram circuit breaker and the other terminal to the machine ground. The indicator light can be connected to the car body.
• Turn on the ignition and carefully turn the drum clockwise. Turn until the indicator lights up, then stop turning. It may happen that the light bulb does not light up. Repeat all steps from the beginning.
• Tighten the distributor mounting screw. Place the cover in place, focusing on the center line. Check the adjustment starting with the first cylinder. The check is performed counterclockwise.

Malfunctions and repairs

Common problems:

1. Lack of battery charging occurs when the drive belt slips due to wear or low tension. Repair consists of installing a new part and adjusting the tension. Another reason may be wear on the brush assembly, which needs to be cleaned of dirt and carbon deposits. At the same time, it is recommended to inspect and clean the collector; if there is severe wear, the surface is worn away.
2. Constant overcharging of the battery occurs due to a breakdown of the voltage regulator or damage to the power circuit of the integrated unit. The burnt part is replaced with a new one.
3. Low generator power occurs when the belt slips or the regulator is damaged. It is also possible that there is an interturn short circuit inside the stator windings, which will have to be replaced. It is recommended to check the functionality of the diode bridge.
4. Accelerated wear of the brushes occurs when the commutator beats or the surface of the unit becomes oily. Repair consists of grinding the surface and degreasing it with gasoline.

How to check

Testing the generator is carried out using a test device that is connected to the positive terminal and the housing. The voltage should be in the range of 13.5-14.6 V.

The voltage regulator is tested using a lamp and applying increased voltage. You can thoroughly check the generator in a workshop using a special stand.

Replacing the alternator belt

The type and size of the belt depends on the engine model. For example, the ZMZ-409 injection unit uses a poly-wedge part with a length of 1220 mm. To remove the element, you need to loosen the tensioner pulley and then unscrew the generator mount. After this, the belt is removed from the pulleys and a new part is mounted.

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To replace the V-belt used on carburetor engines, you need to loosen the generator. After installing the new part, tension is ensured by moving the housing along the guide bracket

It is important to align the generator and crankshaft pulleys in the same plane, which prolongs the life of the belt and reduces operating noise

electrical circuit in its simplest form

The good old UAZ-469 is one of the simplest cars. It looks like it was put together from a children's construction kit, there are no frills or decorations here. Instead of air conditioning, there is the ability to remove the soft roof, and instead of power packages, there is a complete absence of anything that could be controlled using the package. However, this car does have an electrical system. Although the same circuit diagram of the UAZ-469 ignition circuit is implemented in the simplest way.

Coil device

Underwater ignition in a jeep

The ignition coil in the UAZ 469 car has a complex design:

• high voltage screw output;
• output voltage;
• cover;
• contact spring;
• low voltage terminal;
• gasket for sealing;
• mounting bracket;
• magnetic cores;
• contact plate;
• primary winding and secondary winding;
• insulation gaskets;
• Body;
• insulator;
• iron core;
• insulating mass;
• resistor and its insulator;
• Screw and plate for fastening the resistor.

The distributor is designed to distribute and interrupt the ignition timing on a UAZ 469 vehicle. It has vacuum and centrifugal regulators. The centrifugal changes the ignition angle of the UAZ depending on the speed of rotation of the crankshaft or camshaft.

Spark plugs are a very important component. They are used to ignite the working mixture in the combustion chamber in the cylinders and provide a good spark to quickly start the car. The most common spark plugs are A12BS spark plugs, which cannot be disassembled, so in case of failure, you should have new ones in stock that can be quickly and easily replaced.

High-voltage wires are made of PVL-1 wire. They connect the coil to the distributor, and the distributor to the spark plugs. The plugs are attached to the central electrode using special terminals with resistors.

Differences between ignition systems

The main difference between the two systems is the timing of the spark:

• In classic ignition, this is done by a slider under the marker cover, which is in contact with the spark plug wire terminal. In this case, the high-voltage pulse is supplied as a rising pulse. It is, so to speak, lubricated, which reduces the spark strength at the spark plug electrodes.
• With contactless ignition, the switch generates a charge and releases it almost immediately after receiving a signal from the Hall sensor. This allows the spark plug to produce a stronger spark. Among domestic off-road vehicles, such a contactless ignition system is found on the Niva - see the VAZ 21213 wiring diagram.

What characteristics does the generator have?

The factory UAZ is a fairly low-power vehicle. On earlier releases, the output current of its generator was only 40A. Then the parameter increased to 60A. The design of the rectifier unit and voltage regulator has changed. What kind of standard generator did the UAZ “Bukhanka” have? Model 452 is a very unreliable unit. Fortunately, you can easily find out about its problems using the ammeter built into the dashboard. Another feature of the old generator is the voltage regulator, made in the form of a separate unit. If it malfunctioned, due to self-excitation of the winding, the engine refused to stall when the ignition was turned off.

New generators have a different design and, accordingly, a different connection diagram. Here the voltage regulator is built into the brush holder and is made as a single unit. The differences also apply to the drive belt. Old devices were driven by a narrow belt, new ones by a wider, poly-V belt. The UAZ Patriot generator is more powerful, with an output current of up to 120A, since this vehicle has many electrical consumers installed, which is not present in previous models.

Spark plug gap. What should it be and what does it affect?

Although spark plugs are simple, they must be handled and used correctly. They should be properly cleaned, selected and replaced. However, even new versions can sometimes cause problems - the car may run unevenly, sometimes there are jerks during acceleration, as well as slight detonation. Many people immediately begin to look for the cause in the ignition system - of course, the spark plugs are new! However, the gap between the electrodes may be the culprit, just fix it and the engine will just start singing...

First a little definition.

The spark plug gap is the distance between the top and bottom electrodes for optimal performance and ignition of the fuel mixture. If this clearance deviates from the recommended specifications, the engine will run rough and you may experience jerking or knocking similar to your engine.

Simply put, if the gap differs from the norm set by the factory or dealer, then you can even half the engine and still not find the reason. It is especially strong in carburetor systems. But first, I suggest you start with the device and operating principle.

Engine tuning options

Since the UMZ 417 carburetor engine has a heavy piston system, tuning is carried out according to the following scheme:

• boring of exhaust seats up to 39 mm and use of valves from 412 internal combustion engines;
• installation of a 51 mm exhaust pipe;
• Replacing the stock camshaft with a city camshaft to increase torque at low speeds.

Thus, the UMZ 417 motor was copied from the 402 power drive of the Zavolzhsky Motor Plant with minor changes. Even with existing shortcomings, the internal combustion engine serves regularly in UAZ all-wheel drive buses, trucks and SUVs, that is, in very difficult operating conditions.