Carburetor repair on VAZ 2108, VAZ 2109, VAZ 21099 cars

The majority of VAZ cars of the Samara family, and in particular the VAZ-2109, came off the assembly line with a carburetor power system, and only later a small series received injectors. The carburetor system has a simple design and is quite reliable, but its main component, the carburetor, requires periodic adjustment. The VAZ-2109 and other models of the family were equipped with Solex carburetors, characterized by a relatively simple adjustment technology that every car enthusiast can perform.

There are two main carburetor settings - the fuel level in the float chambers and the engine speed at idle (idle). These adjustments are carried out when the engine is unstable at idle and when certain symptoms of improper operation of the power system appear:

These problems indicate that the fuel level in the chamber is not normal.

Disassembling carburetor 2108, 21081, 21083 Solex:

Thank you very much for such a detailed and thorough answer! There seem to be no problems with acceleration and failure. There is a moment when you stand at idle for a long time, the engine warms up well, the fan turns on several times, or, say, in the summer, when the engine temperature rises above normal (turned off the engine, went to run errands, returned, started it), then there are several dull moments at start and during driving time, but after a minute everything is smooth. There were different thoughts, but I decided to try moving the distributor to +. So far no dull spots have appeared.

The second chamber transition system is necessary to force the supply of fuel when the second chamber throttle begins to open, in order to enrich the mixture and prevent “failure”. Approximately, this is a transition from medium loads to power loads, for example, acceleration when moving at average speed. If the fuel intake tube is cracked above the fuel level in the float chamber, then the vacuum (by which the fuel is “sucked out”) in the transition system will decrease, little gasoline will flow under the throttle valve and a “failure” will occur. If the tube is cracked on the part that is immersed in gasoline, then in principle there is nothing terrible. In most cases, the operation of the second chamber transition system is invisible and insignificant. Therefore, if there is no pronounced “failure” in the operation of the engine when accelerating the car in motion, then you can not pay much attention to this problem.

Thanks for the answer! It seems to be doing its job - it is blowing, but I can’t figure out where the impact is, is the tube intact or not... and if not... then what effect can this have? It is flattened near the entrance of the tube into the body.

These tubes did not have to be changed. I changed the tube in the CXX channel. There you need to insert a 2 mm drill inside, wrap the tube with a piece of sandpaper, grab it with pliers and pull the tube out of the socket. The effort when pulling out the tube is not very large. The new tube was simply inserted into the hole and lightly tapped on top with a hammer. Of course, a drill cannot be inserted into the tubes of the econostat and the transition system, so there is a risk of damaging them. But if the tube is already damaged, then it is quite possible to pull it out and replace it with another one. If possible, it is of course better to look for a different carburetor cap.

Colleagues, please tell me how the tubes of the econostat and the transition system of the second chamber are mounted? Someone flattened the tube of the transition system of the second chamber for me. I haven’t yet understood why exactly this was done. Apparently... to save fuel. But for some reason I don’t really like her look. The blow was apparently a screwdriver. So I’m thinking... is it possible to replace it?

How did you check this? If the return to the tank

I took it apart, washed it, cleaned it, and took a used 83 Solex. Economizer of power modes, I did this: I turned off the jet, removed the spring from the diaphragm. I installed a few jets in 1kam.tzh-85 and distributed a few; vzh-168; in the second tzh-95; vzh-125; Returning directly to the tank is a must. Result: I drove 1 liter for 15.5 km. But I haven’t corrected everything yet. But the car is a classic, not inferior to almost anyone.

VAZ carburetor models are a classic of the domestic automobile industry that cannot be avoided. Despite all the shortcomings of such cars, they have one advantage that makes them popular among drivers - low price. Many people buy a VAZ 21083 with a carburetor as their first car.

Solex design

The carburetor mechanism of all modifications on the VAZ 2108/2109 is emulsion and consists of two internal combustion chambers. At the top of the carburetor there is a cover that prevents dirt from entering the cavity of the device, and fittings - fuel lines are supplied to them. The middle part is the body itself, into which diffusers and cameras are mounted. At the bottom of the carburetor are the float chamber and throttle valves.

The key elements of the system are:

• accelerator pump;
• float;
• throttle thrust;
• forced idle economizer;
• main dosing system;
• trigger mechanism;
• econostat;
• vehicle idle system.

The principle of operation of the Solex carburetor is that gasoline is supplied through the inlet valve in the fitting. The fuel is directed directly into the float chamber. The fuel level in the cavity must always be at a certain level to avoid dips and jerks in engine operation. Level control is carried out through the movements of a needle valve mechanism.

After the chamber, gasoline is sent to emulsion wells, where it is supplied in strictly limited quantities through fuel nozzles. It is in the wells that air flows break up large drops of gasoline, forming a single air-fuel mixture with it.

The mixture is supplied to diffusers, and through them to the power unit device. Thus, the main task of the carburetor is to form the air-fuel mixture in the desired consistency and direct it to the engine.

The interaction of many elements ensures smooth operation of the motor

This is interesting: Soldering a car radiator - fixing the leak yourself!

History and design - what is remarkable about the VAZ 21083?

At the end of the 80s, when the first VAZ 21083 rolled off the assembly line, the carburetor type of engine had a monopoly - they had not even dreamed of VAZ injectors then. From the first days, this model received high ratings from drivers as one of the best in the VAZ series. However, then little thought was given to the price of gasoline, which cannot be said now.

The VAZ 21083 car has 2 doors, a very good streamlined shape, which is important when driving, and also handles well on the road. The main characteristics of this model are a 1.3 liter four-cylinder engine. Some models were produced with a capacity of 1.1 liters, but they did not perform very well. The production of such cars was more of a test nature, and only a few cars were produced.

VAZ 21083 has about 70 l/s in its engine and is capable of reaching speeds of up to 160 km/h. Due to its Solex carburetor, this car model is quite economical. Average consumption reaches 5.5–6 liters per 100 km. The carburetor is very technically well thought out and is not picky about fuel quality.

Solex carburetors were first used in France, where they got their name. At factories on the domestic market, this type of device was redesigned and some changes and improvements were made. Solex-type carburetors began to be installed on cars almost immediately with the first releases of this VAZ model.

The most noticeable change in the engine design was the installation of the carburetor not along, as in previous VAZ models, but across. It was necessary to change the design of the engine under the hood because it was necessary to improve and make the operation of the engine in the car more stable during large ascents and sharp descents. Later, this type of carburetor began to be used and installed on all VAZ cars.

Models of carburetors for VAZ 2108/2109

Carburetor mechanisms of the Solex series are produced at the Dimitrovgrad Automotive Accessory Plant. The designs are intended for use with front-wheel drive VAZ vehicles, in which the engine unit is located transverse to the body.

The standard model for equipping the VAZ 2108/2109 is the DAAZ 2108–1107–10 carburetor. It is paired with a 1.3-liter engine. Carburetors 21083–1107010 are installed on 1.5 liter engines.

The DAAZ carburetor is used to equip all cars of the eighth and ninth models

Modern equipment of the VAZ 2108/2109 is provided by carburetors of more advanced models, since they are equipped with a starting device in automatic mode:

• modification 21083–1107010–31 has one stage of automatic control and start in a given mode;
• modification 21083–1107010–35 is equipped with two stages of air damper control, which ensures more stable operation of the power unit;
• modification 21083–1107010–62 is similar to the previous version of the carburetor mechanism, but has the addition of an electrical air-fuel mixture mixing system.

This is interesting: Replacing the fuel filter - we will protect the engine from debris!

Carburetor design - what is responsible for what?

The Solex carburetor in a car serves to supply the fuel mixture to the engine, where it is further ignited. It mixes the required amount of fuel with air, the ratio of which varies depending on the speed of movement. The VAZ 21083 carburetor consists of two chambers. It is in them that fuel is supplied and mixed for further work. The entire main process takes place in the second chamber.

The main mechanism in the operation of the device is the econostat; it is located in the second chamber of the carburetor. Due to its operation, when driving at high speed, the fuel mixture is enriched with oxygen. The fuel in the carburetor rises through the pipes. The carburetor jets are responsible for the correct and uniform supply of fuel. Therefore, it is very important that they are configured correctly.

The air supply to the carburetor occurs through special channels in the chamber and is controlled by the throttle valve. In the first chamber, the throttle valve is adjusted using the accelerator. In the second chamber, it opens and closes automatically.

In the cold season, it is much more difficult to start the VAZ 21083 engine than in the warm season, and therefore a more saturated fuel mixture is required. The starting device in the car is responsible for preparing such a mixture. The starting device performs the process of retracting the throttle spring, then the air damper opens under the air flow, resulting in uniform mixing of the fuel mixture.

The economizer is responsible for idling the car in the Solex carburetor. It consists of elements such as a switch, a control unit and a solenoid valve. When the engine is idling for a long time and forcibly, the speed can reach up to 2000 rpm. During normal operation, this value should not exceed 900-1000 rpm. During this, the economizer is activated, which, using the control unit and its valve, shuts off the fuel supply to the idle system. It also cuts off the fuel supply during sudden engine braking and during engine operation when driving downhill. This type of device also serves to prevent large emissions of carbon dioxide into the atmosphere.

What jets are on the VAZ 2109 carburetor

A jet is a device for precise dosing of fuel, air or their consistency (emulsion). Dosing occurs through a calibrated hole in the nozzle. On carburetors 2105, 2107 Ozone in various systems there are 13 jets. Let's look at their calibration data and placement on the carburetor. This information can be useful when checking the compliance of the jets with the nominal value, adjusting the carburetor for low fuel consumption, or, on the contrary, adjusting to increase the power characteristics of the engine by selecting jets.

READ What kind of engine oil for VAZ 2107 carburetor

What are the prices (sizes)

Characteristics and calibration data of DAAZ 2107-1107010 Ozone and 2107-1107010-20 Ozone carburetors

The diameter of the narrow part of a huge diffuser

The diameter of the main fuel jet GDS

The diameter of the main air jet GDS

Idle system and transition systems

Cross section of the idle fuel jet

Diameter of the idle air jet

The diameter of the fuel nozzle of the transition system of the 2nd chamber is 0.6 mm

The diameter of the air jet of the transition system of the 2nd chamber is 0.7 mm

Productivity per 10 presses – 7.0±1.75 cm3

Pneumatic drive of the 2nd carburetor chamber

Abstract: carburetor adjustment. Malfunction of the fuel pump, the material is available at the link. The oil gets into the air filter https://vz07-up.ru/pit/vozdushnyj-filtr.html#t3.

Replacement

The main problem that sometimes appears in the operation of the VAZ 2107 carburetor is that the jets become clogged, as a result of which their throughput decreases. During maintenance, it is recommended to blow or flush them using special liquids that are used to flush the carburetor. According to the instructions for the use of the indicated liquids, the jets can be processed superficially, without disassembling the carburetor. You can do blowing in the same way.

Often these measures are enough to restore the functionality of the VAZ 2107 fuel system. But if there is significant clogging, you will still need to disassemble the carburetor and alternately unscrew and wash the jets. It is better to do this on a flat surface, covered with newspaper or a clean rag, so that the large number of small parts that make up the carburetor do not get lost or mixed up.

After cleaning and assembly, adjustment at idle and under load is recommended. For this, special adjusting screws are used. First, the idle speed is adjusted, achieving stable engine operation at a speed of 800-1000 rpm. After this, the efficiency of the engine under load is checked, the absence of failures when transitioning from idle to maximum speed. When they appear, use the quality screw to increase the amount of fuel in the mixture, while simultaneously tightening the quantity screw to set the idle speed to the previously specified value.

Breakdowns and their elimination - we repair the carburetor

Quite often, car owners encounter problems with the Solex carburetor. This happens while the car is moving, as well as when the engine is idling. It is quite easy to identify problems with the carburetor.

• When you try to start the car, it may stall, the tachometer speed on the instrument panel floats.
• When idling, exhaust may appear from the car pipe.
• While driving and changing gears, there may be dips in the gas pedal.

What jets should be on an ozone carburetor?

— Fuel, air and emulsion jets of the Ozone carburetor econostat

Dynamic Solex carburetor from a conventional carburetor in one movement

Carburetors Ozone 1st chamber 2nd chamber

Repair stages - what to turn and where to adjust?

The carburetor in the VAZ 21083 is located under the air filter cover. To remove it, you need several keys. Before this, you need to open 4 latches. After this, loosen all the clamps that go to the carburetor. Next, disconnect the contact wire from the solenoid valve and unscrew the carburetor cap. You need to remove it in such a way as not to catch the walls of the floats in the chamber, because you can break them.

The floats in the carburetor chamber must be parallel to each other. If there are any deviations or inaccuracies in the operation of the floats, the fuel will be distributed unevenly throughout the chambers. The chambers have red marks on the body that indicate the permissible fuel level.

The jets inject fuel into the engine. Normal working jets have three holes. With very long operation and low-quality fuel, they wear out, as a result of which fuel is supplied in the wrong quantity. Adjustment of the jets must be done gradually. When replacing, they must be tightened firmly without using significant force.

When using a car regularly, timely cleaning of the Solex carburetor is very important. It is strongly recommended to carry it out at least once every six months. This will significantly extend the life of your carburetor and provide a more comfortable ride for your car.

Adjusting the float of the "nine" carburetor

Setting up floats in Solex chambers is a simple procedure that does not require the use of specialized tools or special skills.

However, in the factory, this procedure is partially automated and is performed using a special template, which significantly simplifies the adjustment. But if you do the work yourself, you don’t need a template, but we will need the following tools and equipment:

• two screwdrivers, with a flat head and a Phillips head;
• a caliper or ruler (it is better not to use metal, wood or plastic);

• a piece of wire with a diameter of no more than 2 mm (you can use a thin drill or a similar round rod).

This set is sufficient to perform the entire range of adjustment procedures.

Classic method

In accordance with the recommended method, adjusting the fuel level of a Solex carburetor is carried out in stages in the following sequence:

• start the engine and let it run for a couple of minutes to fill the carburetor chambers with gasoline;
• Structurally, access to the carburetor is blocked by the air filter, so it must be removed along with the housing. This is done simply: unscrew the top nut, unfasten the side fasteners to remove the cover, remove the filter itself, and then dismantle the air filter housing by unscrewing the 4 fastening nuts;
• after lifting the case, it is necessary to disconnect the rubber pipes from it;
• now we perform the same operation with the fuel pipes connected to the carburetor; when removing them, there is a risk of spilling gasoline remaining in the system, this circumstance must be taken into account;
• now you need to disconnect the wire going to the solenoid valve of the XX system;
• the turn has come to disconnect the air damper drive (the cable coming from the choke handle);
• you can begin to remove the Solex cover, which is secured with five screws;

• After the carburetor cover is put aside, you can immediately measure the current fuel level in the PC using a caliper depth gauge or simply lowering the ruler down all the way. Normally, this distance should be within 2.5-2.6 cm; if this is the case, subsequent adjustment of the fuel level of the Solex carburetor is not required;
• if the gasoline level is less or more, you need to inspect the mechanism for attaching the floats, and if everything is normal, adjust them;
• to do this, place the previously removed cover on a horizontal surface, the floats will be at the top;
• We carefully examine the relative position of the elements. The outer sides of the floats must be strictly parallel to the imprints made on the gasket. If there are distortions, this may cause the floats to come into contact with adjacent surfaces and parts, which leads to a change in the fuel level. The problem is solved by bending the fastening levers so that after this the floats move freely and do not touch anything;

• if this is not the case, measure the distance between the gasket and the floats. This gap should be equal to two millimeters, for which we needed a wire of the appropriate diameter. If the distance does not correspond to the standard, bend the tongue through which the float pushes the valve (needle). After this, we measure the height of the floats (guideline - 3.4 cm). If it was not possible to achieve the specified distance, we repeat the procedure with bending the tongue until we achieve the goal;
• The final stage of the procedure is measuring the working chord of the floats. The principle is simple: we install a caliper near the float, measure the distance from the surface of the Solex cap to the lower edge of the float, and then lift the float with our hands until it stops. We fix where its lower corner is now located. Normally, the working stroke should be 1.5 cm, if it is more/less, we again turn to the procedure of bending the float tongue.

Setting up the float chamber

This type of work allows you to adjust the optimal amount of gasoline in the float chamber. An incorrect level causes a decrease in power, uneven engine operation, and excessive fuel consumption.

• set of wrenches;
• thin probe (diameter 1 mm);
• pliers.

1. Remove the air filter and unscrew the carburetor cover.

2. Carefully remove the float chamber cover.

3. Check the condition and position of the floats. They should be parallel to the imprints of the side walls of the float bath on the gasket.

4. If they are displaced, we align them by bringing them together or spreading them apart.

5. Next, lay the lid horizontally with the floats up and use a feeler gauge to measure the distance from the bottom of the float to the gasket. It should be equal to 1 mm. If it is higher or lower, we continue further adjustment after installing the carburetor on the engine.

6. When fuel is pumped into the float chamber, its level should coincide with the red lines, as shown in the photo.

7. If the floats are set incorrectly, this level will be lower or higher. Simple adjustment is carried out by bending or bending the tongue of the floats, then closing the carburetor cover and pumping fuel.

For details on setting up the float chamber, see here

What carburetor should be installed on a VAZ 2106?

When thinking about which carburetor is best to install on a VAZ-2106, you need to take into account the engine size. For 1.3-liter units, the DAAZ-2018 option is perfect. For engines with a volume of 1.6 liters, the best choice is DAAZ-21083.

Adjustment

First, a detailed inspection should be carried out, then everything should be properly washed and cleaned of dirt and other defects.

Afterwards you need to clean the mesh filter and rinse the float chamber.

Next you need to clean the air jets.

And - adjustment of the float system (1), trigger mechanism (2) and idle speed (3).

Attention! This work does not require dismantling the carburetor.

Checking the strainer, which is located in front of the entrance to the float chamber, is done at least once every 60,000 mileage.

Setting up the launcher

• open-end wrench 7;
• open-end wrench 8;
• flat screwdriver;
• electronic tachometer or multimeter with its function.

1. Remove the air filter from the carburetor. Pull the “suction” towards you as far as it will go. Next, you will need an assistant to start the engine. At this time, you are watching the starter flap, which should open slightly after starting.

2. If this does not happen, it means that the starter is not adjusted.

3. We begin the adjustment. Warm up the engine, turn it off and connect the tachometer as follows.

4. Pull out the choke and start the engine. The suction valve must be completely closed.

5. Next, use a screwdriver to press on the edge of the damper, opening it 30 0 .

8. In this position, holding the bolt with a screwdriver, tighten the locknut.

The adjustment process can be seen in this video

Idle setting

• flat screwdriver;
• electronic tachometer.

1. Start the engine, warm it up to operating temperature, and then turn it off. We press the “choke” all the way, opening the flap of the starter device as much as possible. We connect the tachometer using the same principle.

2. Start the engine, turn on all the lights and the heater fan at full power.

4. If in this way it was not possible to achieve the required speed, unscrew the quality screw to the maximum number of revolutions. Next, turn the quantity screw, setting the motor to 900 rpm. After this, use the quality screw to reduce the speed to 800 rpm.

Details in the video

Design and operating principle

The carburetor supplies the engine with a fuel-air mixture in various modes. When starting from a “cold” state, the throttle valve is manually fully opened (the so-called “choke”), and the mixture entering the cylinders is completely enriched. After the engine warms up, the speed drops and the choke can be removed. Drivers remove it in different ways, but it is recommended to do it gradually.

The fuel in the carburetor is transferred to the float chambers from the diaphragm pump, and the needle valve controls the gasoline level. Through the chamber, the fuel passes into the channels of the body, where it enters the nozzles, and through them it goes into the first chamber. A fuel-air mixture is formed, which is supplied directly to the cylinders by the gas pedal. The second camera turns on only during sharp acceleration and operation at high speeds.

At idle, the IACV (idle speed solenoid valve) is turned on, while the engine runs stably and the car consumes much less fuel. However, on some devices it can be disabled; if it breaks down, the speed and consumption will only increase slightly, but the car will drive.

Removing and installing the carburetor

Installation and dismantling is done in case of repair of this unit, its complete replacement, also for thorough washing and cleaning. The AHU can become clogged if the car is driven on dusty roads, also as a result of untimely replacement of the air filter element.

Removing and installing a VAZ- 2109 is painfully simple; even with the initial abilities of a car mechanic, almost any driver (car enthusiast) can do such work with his own hands. We perform the dismantling operation as follows:

• turn off the ignition, open the hood, remove the top cover, the filter element, then unscrew the four nuts securing the air filter housing (AFC);
• loosening the clamps, disconnect the fuel hoses, unscrew the two fastenings of the choke cable, move the cable to the side, disconnect the wire chips of the electric valve and the throttle valve closure sensor;
• We also disconnect the throttle cable, having previously removed the return spring, the ignition angle advance hose, and unscrew the nuts securing the carburetor itself (also 4 pieces);
• in order not to lose antifreeze and not to disconnect the coolant pipes, it is easier to unscrew the screw securing the heating unit, but it is located at the back of the case, not in the most accessible place;
• in this case, lift the unscrewed carburetor , move it forward, find a position in which it would be comfortable to remove this fastener;
• Now nothing prevents you from removing the assembly completely.

If the KU is thoroughly stuck to the studs and does not pull off, you can gently tap it at the base with a small hammer and shake it with your hands from side to side. Usually, after several attempts, the device gives in; after removing it, you can begin the upcoming planned operations; installation of the unit is done in reverse order.

Car models 2108-09 are truly famous developments of the Volzhsky Automobile Plant; it was with them that the creation of front-wheel drive passenger cars began in the USSR. VAZ- 2109 Solex carburetor was created and put into production

The carburetor unit (CU) is quite simple to set up, has a generally lightweight design compared to other similar devices, but it has its own characteristics and corresponding “diseases”. Here we will look at the structure of the carburetor, its dismantling and installation, the specifics of adjustment, adjusting the gasoline level, and debugging the starting mechanism.

Signs of a carburetor malfunction

It is a well-known fact: the quality of fuel in our country leaves much to be desired. As a result, the carburetor may become clogged with oils, solid particles, etc.

In this case, one or more signs may be observed:

• significantly increased fuel consumption;
• the engine does not start “cold”;
• loss of dynamics;
• "triple" of the engine.

You can restore functionality yourself. If unsuccessful, you can remove it and take it to a mechanic, who, with an experienced eye, will immediately identify the errors and adjust it “by eye,” after which the car will at least start.

First, you can try adjusting the carburetor without removing it from the car.

Setup and adjustment

First of all, the engine warms up until the fan turns on. Next, adjust the speed by ear using the quantity screws. The operation should be smooth, with a sharp press on the gas pedal there should be no dips, and the speed should increase quickly and smoothly. The quality screw regulates the amount of exhaust gases. Ideally, no escaping gases should be visible from the exhaust pipe in the dry season (they will be, but not visible to the eye, if everything works correctly). Everything can also be done by looking at the tachometer readings. Unfortunately, many models of Soviet cars do not have it at all, so most often the adjustment will have to be done by ear.

For complete adjustment, cleaning and tuning, the carburetor is removed from the car. Procedure for removing the device from the car:

• the air filter and its housing are removed;

• all tubes and cables are disconnected;

If you are not sure that you will be able to put everything back, you can photograph all fastenings before disconnecting, for example, with a mobile phone camera.

Take care of the place where the work will be performed. It should be ventilated, free from various suspensions, the table should be wiped and covered with a cloth or old newspapers. It is better to have a carburetor diagram before your eyes. It is advisable to place small parts in various jars and boxes strictly in order. Prepare a container for solvent brand “646”. Buy a repair kit for your carburetor, it costs mere pennies.

• look at the floats. They must be parallel to each other. If there is any mechanical damage, replace it with new ones without hesitation. The needle valve should move freely in the seat, and the ball should not linger anywhere;

Lada 2106. › Logbook › Solex carburetor 083 (Pekar) a lot of literature. And Photos of works.

The figure shows a VAZ Solex 21083 carburetor.

The design of the carburetor VAZ Solex 21083.

1. Carburetor heating unit 2. Throttle valve of the first chamber 3. Pipe for suction of crankcase gases 4. Accelerator pump drive lever 5. Accelerator pump drive cam 6. Accelerator pump diaphragm 7. Power mode economizer fuel nozzle 8. Pump housing 9. Economizer diaphragm power modes 10. Shut-off solenoid valve 11. Idle fuel jet 12. Carburetor cover 13. Main air jet of the first chamber 14. Air damper 15. Accelerator pump nozzles with fuel supply valve 16. Starter diaphragm 17. Starter adjustment screw 18. Adjusting screw for the amount of idle mixture 19. Locking lever of the second chamber 20. Pipe for supplying vacuum to the vacuum regulator of the ignition distributor 21. Adjusting screw for the quality of the idle mixture 22. Throttle valve control sector 23. Throttle valve drive lever 24. Adjusting screw for opening the throttle damper of the first chamber 25. Air damper control lever 26. Starter rod 27. Electrical wire of the limit switch of the forced idle economizer 28. Air damper lever 29. Main air jet of the second chamber 30. Emulsion tube 31. Sprayer of the main dosing system of the second chamber 32. Fuel supply pipe 33. Fuel drain pipe into the tank 34. Fuel filter 35. Needle valve 36. Second chamber throttle valve 37. Second chamber throttle lever 38. Second chamber main fuel jet 39. Second chamber throttle drive lever 40. Float

Features of the functioning of other Solex units

To shut off the supply of gasoline to the first chamber (more precisely, to its transition device) and to the XX device, a valve called an electromagnetic valve is used. Its standard state (when no voltage is applied) is closed. Opening of this element is possible in two cases: when the crankshaft speed is less than 1900 per minute; when you press the gas. When the ignition is turned off, and also when the car picks up speed above 2100, the solenoid valve returns to its normal (closed) state.

Of great importance for the adequate operation of the G8 carburetor is an accelerator pump of a diaphragm design, equipped with a mechanical drive. It has two valves in its design. One of them is in the sprayer. Under the load of injected fuel, it opens, and when gasoline is no longer supplied, the valve closes under the pressure of its own mass. Thanks to this valve, there is no air leakage, and gasoline does not escape from the channels.

Another valve (check valve) is placed directly in the channel that connects the pump cavity and the float device. If the driver releases the gas, the chamber is filled with fuel and the check valve opens. Its closure occurs at the moment when fuel begins to be pumped.

The cam, which is part of the pump we are considering, presses on the lever when the throttle valve opens. This lever is connected by a diaphragm. Due to this, a portion of fuel is supplied to the carburetor chambers, which allows the fuel mixture to be qualitatively enriched when accelerating the vehicle.

When the throttle valves are opened significantly, another important mechanism begins to operate - the economizer. The essence of its work is this: through a valve (it has a ball design) gasoline is taken from the float device. The valve is held closed while vacuum holds the diaphragm in the manifold. When the dampers are opened, a decrease in vacuum is observed. It is important that the fuel for enrichment flows into the emulsion compartment through the economizer, bypassing the main jet.

Let us briefly describe several more systems of the carburetor we are interested in:

• Intake manifold (IMC). This mechanism is attached to the motor using heat-resistant gaskets and pins. The manifold is made from an aluminum-based alloy by casting. The task of the VK is to transfer the combustible mixture formed in the carburetor to the cylinders of the car engine.
• Econostat. The mechanism is necessary for additional supply of gasoline to the second chamber from the float device (fuel is supplied through an intricate system of tubes and econostat jets). The econostat turns on when it is necessary to further enrich the fuel mixture (for example, when driving at maximum power).
• Idle speed economizer (forced). This device includes in its design a shut-off solenoid valve, a screw sensor, and a control unit.

Solex 21083 carburetor design

1 – driving lever, second drive chamber; 2 – screw adjusting the amount of mixture supplied for idle speed; 3 – sector for heating the carburetor; 4 – engine crankcase ventilation pipe; 5 – drive lever for the accelerator pump; 6 – solenoid shut-off valve; 7 – air damper lever; 8 – carburetor cover; 9 – special screw for fastening the liquid chamber; 10 – liquid chamber body; 11 – carburetor body; 12 – throttle valve lever of the second chamber; 13 – control lever block directly for the throttle valves; A - special marks for precise installation of the bimetallic spring of the starting device.

1 – axis for the float; 2 – needle valve; 3 – float; 4 – special gasket for the carburetor cover; 5 – starter cover; 6 – screw; 7 – trigger device diaphragm; 8 – special gasket; 9 – air damper lever; 10 – idle fuel jet; 11 – solenoid shut-off valve; 12 – pipe for supplying a combustible mixture; 13 – carburetor cover; 14 – fuel filter; 15 – housing assembly with drive levers of a semi-automatic starting device; 16 – screws for adjusting the air damper of the starting gap and slightly opening the first throttle chamber; 17 – special clamp for securing the bimetallic spring housing; 18 – liquid chamber; 19 – assembled housing with a bimetallic spring; 20 – bimetallic spring screen.

Solex 21083 carburetor diagram

1 – screw adjusting the amount of feed mixture for idle speed; 2 – electric wire of the limit switch economizer for forced idling; 3 – carburetor heating unit; 4 – diaphragm for the accelerator pump; 5 – accelerator pump cover; 6 – drive lever of the accelerator pump; 7 – accelerator pump drive cam; 8 – economizer cover for power modes; 9 – diaphragm for economizer of power modes; 10 – fuel jet for power mode economizer; 11 – power mode economizer valve; 12 – nozzles with a fuel mixture supply valve for the accelerator pump; 13 – sprayers of the main dosing systems; 14 – air main jets with emulsion tubes; 15 – fuel main jets; 16 – carburetor body; 17 – adjusting screw for the throttle valve; 18 – stopper for the adjusting screw; 19 – stopper cap; 20 – throttle valve of the second chamber; 21 – throttle valve axis of the second chamber; 22 – throttle valve rod for opening the first chamber; 23 – block with throttle valve control lever; 24 – return spring of the throttle valve of the first chamber; 25 – driven lever, drive of the throttle valve of the second chamber; 26 – driving lever, driving the throttle valve of the second chamber; 27 – spring of the throttle valve drive levers of the second chamber; 28 – throttle valve of the first chamber; 29 – return spring of the throttle valve of the second chamber; 30 – plug for the screw adjusting (composition) the quality of the idle mixture; 31 – axis of the throttle valve of the first chamber; 32 – screw adjusting the quality of the supplied idle mixture

The carburetor is equipped with two main metering systems, the second and first chambers, an idle system with a transition system of the first chamber. A transition system of the second chamber, an econostat, an economizer of power modes, a semi-automatic starting device and an accelerating diaphragm pump.

The Solex 21083 carburetor, the price of which is about 4,500 rubles ($150) and remains acceptable for motorists, has earned its recognition due to its excellent technical characteristics and efficiency. In addition, malfunctions of the Solex 21083 carburetor, which occur quite rarely, are easily fixable if you follow the instructions for eliminating them.

Some car enthusiasts prefer to modify the factory Solex 21083 carburetor to suit their preferences, increasing its power, and thereby the throttle response of their car. There are several options for properly tuning the Solex 21083 carburetor, so, if you wish, you can seriously improve the overall performance of your car.

Removing and installing Solex

In order to repair or purge (flush) the carburetor, it must be removed. Removing the unit is quite simple; almost any motorist can do it independently. We remove the device as follows:

• turn off the ignition, first of all we remove the air filter housing;
• remove the return spring from the throttle valve actuator;
• disconnect the throttle cable;
• unscrew the fastenings of the choke cable;
• unscrew the four nuts on which the carburetor body itself is attached; dismantle the assembly.

Installation is carried out in reverse order.

There are malfunctions that are most typical for Solex carburetors:

• clogging of the fuel jet of the GDS;
• the entry of debris into the idle system; XX jet
• deformation of the lower surface of the main body due to overheating;
• failure of the accelerator pump diaphragm;
• solenoid valve defect;
• loose fit of diffusers in the housing.

If the body is deformed, air is sucked between the carburetor and the intake manifold, and the engine begins to operate intermittently, as the air-fuel mixture becomes leaner. The idle speed is difficult to adjust, and to correct the defect it is necessary to grind the surface on an emery wheel. If the surface warping is significant, grinding will no longer help; the housing must be replaced.

Over time, the accelerator pump diaphragm can crack, lose elasticity, and ruptures appear in it.

Checking the condition of the diaphragm is quite simple; it does not require removing the carburetor. To get to the diaphragm, you need to unscrew the 4 screws of the accelerator pump cover and remove the part. The condition of the diaphragm is checked by external inspection.

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Sources:

https://555-shop.ru/obsluzhivanie/kakie-zhiklery-stoyat-na-karbyuratore-vaz-2101.html https://vz07-up.ru/pit/zhiklery-karbyuratora.html https://avtomobil- vaz.ru/kakie-zhiklery-stoyat-karbyuratore-soleks/