How to remove and repair a carburetor on a VAZ 2106/2107

What models are installed on VAZ 2106/2107 cars

All types of carburetor mechanisms equipped with the VAZ 2106/2107 are aimed at reducing fuel consumption and giving the car maximum dynamism. In addition, an important role is played by such an indicator as environmental friendliness. For a decade, AvtoVAZ engineers gave preference to the most environmentally friendly types of carburetors.

Carburetors of three different models were installed on modern VAZ 2106/2107, as well as on cars produced in previous years:

1. Manufacturer: Dimitrovgrad Automobile Assembly Plant (or DAAZ). It should be noted that the company produced carburetors under license from Weber. Structurally, these devices were as simple as possible both in operation and in further maintenance. In addition, their main advantage was to provide excellent speed performance for cars of the sixth and seventh VAZ models. At the same time, DAAZ carburetors consume a very large amount of gasoline - from 10 to 14 liters per 100 kilometers.
2. Manufacturer: DAAZ, modification “Ozone”. This is a more advanced version of the first type of DAAZ, which has high environmental performance. The device provides good acceleration characteristics and consumes less than 10 liters of fuel per 100 kilometers. However, the disadvantage of this model is that it comes with a second camera. In its operation, a pneumatic valve plays an important role, which, in case of contamination or poor-quality adjustment, can stop the carburetor from working.
3. Manufacturer: DAAZ, modification 21053, which is produced under license from Solex. One of the most modern types of carburetors for equipping the VAZ 2106/2107. Maximum environmentally friendly and productive. It has a more complex design; the first in the DAAZ line is equipped with a reverse fuel supply system, which makes it as economical as possible. However, Solexes are demanding on the quality of gasoline - otherwise the fuel nozzles become clogged very quickly.

Modern VAZ 2107 models are equipped with this unit.

Common features in the design of carburetors for the VAZ Six and VAZ Seven

The carburetor mechanisms that are equipped with all VAZ 2106/2107 models throughout the entire production period of the car are two-chamber, that is, they have two internal combustion chambers . Structurally, all carburetors have three indivisible parts:

• at the top there is a cover of the device, which protects the mechanism from dirt, and fuel fittings;
• the middle part is a housing, inside which the chambers and diffusers themselves are located, transfers the air-fuel mixture to the engine;
• The float compartment and throttle valves are located in the lower part.

In the operation of DAAZ carburetors, small parts are of great importance - gaskets, jets, float, economizer or dampers. All elements of the system are interconnected and failures in one part will inevitably lead to failure of the entire device.

The DAAZ carburetor on the VAZ 2106/2107 works according to the following principle:

1. Gasoline enters the float chamber through the inlet valve.
2. The required fuel level is regulated by the needle of the forced idle economizer or power stroke economizer - in any case, fuel enters the chamber in a strictly defined proportion.
3. Next, the fuel is sent to emulsion chamber No. 1 through nozzles.
4. In the chamber (or VBC), gasoline is crushed into small parts and mixed with air.
5. When the torque increases during acceleration, internal combustion chamber No. 2 may also be activated.
6. After the formation of the air-fuel mixture, the pump directs it to the diffusers, and through them to the engine.

That is, the main task of the carburetor is to form the air-fuel mixture in a strictly adjusted proportion to ensure smooth operation of the engine.

The presence of many small elements ensures reliable operation

What is a carburetor

The carburetor is an indispensable part of the VAZ 2107 car. It helps it start the engine by mixing gasoline and air, controlling their quantity. Thus, there is control over the fuel content in this mixture, which is called air-fuel.

The main elements of the carburetor are:

• fuel container or float chamber;
• float with a special needle shut-off valve;
• spray;
• main body part (mixing chamber);
• narrowing of the carburetor air neck - diffuser;
• air and throttle valves;
• fuel and air channels with jet holes.

How to repair a carburetor yourself

Repair work on the VAZ 2106/2107 carburetor involves removing and disassembling the mechanism. In this case, the repair includes all two stages:

1. Washing (cleaning, blowing) elements from carbon deposits and adhering dirt.
2. Replacement of worn or failed parts.

Before carrying out any actions with the unit, you must firmly make sure that the carburetor is faulty. Often, incorrect operation of other systems can affect the performance of the carburetor mechanism.

For the smooth operation of an internal combustion engine, high-quality cooling is necessary. One of the elements of this system is a water pump, which circulates the antifreeze. You can read more about repairing your pump yourself here:

The carburetor is located under the hood, above the engine.

Troubleshooting

DAAZ carburetors of any modification are designed to operate stably regardless of operating modes. However, it is precisely the change of modes (for example, starting “cold” or accelerating when overtaking) that can show the first problems in the operation of the device. The carburetor is clearly faulty if:

• at idle there are failures in engine operation;
• while driving, a time interval is noticed between pressing the gas pedal and accelerating the car;
• jerks in engine operation at high speeds;
• a series of jerks when overtaking;
• Gasoline consumption has increased significantly;
• Difficulty starting the engine after long periods of parking.

Each of these signs, as well as their combination, indicates that there is a problem with the carburetor and repairs or adjustments are necessary.

Overflows

One of the most common problems with carburetor engines is the so-called overflow. An excessive amount of fuel is supplied inside the device, and for some reason the check valve is not able to drain excess gasoline back into the tank. Therefore, under the carburetor and on it itself, the driver may notice drops of fuel.

In this case, it is recommended to clean all the fuel supply and exhaust channels, as well as the jets - most likely, the holes are clogged with debris. Diagnostics of the accelerator pump will not be superfluous.

Shoots

This concept is inextricably linked with transfusion. If the carburetor begins to shoot (or sneeze) - that is, jerk sharply while driving and even ignite - there is a fuel leak. The mechanism needs to be flushed.

Gasoline is not supplied

The problem may lie either in the carburetor itself (the jets are seriously clogged or the pump is broken) or in the supply hoses. It is recommended to blow out the fuel supply pipe and test the operation of the fuel pump. If they function normally, you will have to remove the carburetor and wash it.

The secondary internal combustion chamber does not work

Failure to operate PIC No. 2 will immediately affect the vehicle’s dynamism: it loses almost 50% of its original speed characteristics. The problem is that the throttle valve is sticking, which regulates the flow of fuel into the chamber cavity. You will have to disassemble the mechanism and replace the damper with a new one.

Video: how to repair a carburetor on a VAZ 2106

Cases when it is necessary to replace cylinder head gaskets

Replacing the cylinder head gasket of the VAZ-2107 is mandatory in a number of cases:

1. If there is damage near the combustion chambers, engine overheating leads to this unpleasant situation. When the cooling system malfunctions, and the driver prefers not to pay attention to the malfunction and puts off repairs, the condition of the cylinder block and its head leaves much to be desired.
2. A leak of antifreeze or coolant is noticed - a breakdown is often accompanied by incorrect operation of the ventilation device, thermostat, or a banal leak of substance from the hoses.
3. There is an engine oil leak. If traces of oil leakage are noticed on the outside, it means the gasket is not fitting well. Tighten the head bolts, if this does not help, then you will have to replace the cylinder head gasket yourself.

How to remove the unit

Indeed, this question may take an inexperienced owner of a “six” or “seven” by surprise. But the dismantling procedure itself is not considered difficult. The main thing is to remember or write down the connection points of different hoses, since the reverse installation may cause difficulties during the first experience.

It is recommended to dismantle the DAAZ carburetor on a cold engine, since the device is located directly on the intake manifold.

It is important to disconnect the fuel lines and wires in sequence

The preparatory stage includes removing the air filter box, since the filter will prevent free access to the carburetor . Further work takes no more than 10 minutes:

1. First, two thin wires are disconnected from the carburetor body - the first ensures the operation of the air damper, and the second is connected to the throttle.
2. The return spring and its retainer are immediately disconnected.
3. The next step is to disconnect the forced idle economizer wire.
4. Loosen the clamp connection on the wide gasoline supply pipe and remove the hose itself. After this, you can remove the fuel return hose.
5. The ventilation and vacuum hoses can be disconnected from the fittings at the top of the housing.
6. Next, it is possible to dismantle the carburetor block itself. To do this, you need to unscrew the four fastening nuts and carefully remove the carburetor along with the gasket from the studs.
7. During work, it is recommended to close the open hole in the manifold with soft cloths or a special plug, which can be purchased at a car dealership. This will ensure the cleanliness of the engine and prevent dirt from getting inside the power unit.

Washing DAAZ without disassembling

Flushing DAAZ carburetors is recommended by the manufacturer in cases where there are clearly any problems with its operation: increased gasoline consumption, jerks and jolts when driving, unstable idle speed, problems with starting.

The traditional method of washing carburetors is to completely disassemble them into individual components, which is not always possible for an inexperienced VAZ owner to do. To simplify the procedure, a technique was created for washing and cleaning the carburetor without disassembling it into components. This technique is based on the use of special aerosols in cans. The most affordable carburetor cleaners are considered to be aerosols produced by ABRO and Mannol - they can be bought at any auto store for 100–150 rubles.

The cans are equipped with a thin tube for access to all parts of the carburetor

These cleaners do an excellent job of cleaning carburetor mechanisms, and they are also very easy to use. To flush the carburetor, it is recommended to turn off the engine, let it cool and begin the procedure:

1. Remove the air filter box from the car and place it to the side.
2. Unscrew the solenoid valve from the carburetor body.
3. Place a special narrow nozzle on the aerosol can and treat the nozzle channels, first and second chambers, dampers and all visible elements of the carburetor assembly with liquid.
4. After this, spray the aerosol on the external parts of the mechanism.
5. Wait 5–8 minutes (depending on the aerosol manufacturer’s recommendations). During this time, the liquid will be able to corrode accumulations of soot and dirt.
6. Next, you can start the engine so that it removes all remaining dirt.
7. If during one procedure the carburetor did not have time to be properly cleaned, then you can treat it again with the same aerosol.

After such cleaning, the VAZ 2108/2109 will significantly increase its dynamic characteristics, since the accumulation of dirt will not interfere with the normal operation of all parts of the carburetor.

How to change the gasket

Over the years, gaskets made from a wide variety of materials were installed on DAAZ: heat-resistant cardboard, paronite, metal. The main function of the gasket is to create the most reliable and tight connection between the carburetor body and the surface of the engine intake manifold. This is the only way to ensure normal operation of the power unit.

After dismantling the carburetor, it is necessary to inspect the gasket for deformations, tears or severe dents. The manufacturer recommends changing the seal after each carburetor removal.

On the left - new, in the center - when dismantling the carburetor for the first time, on the right - after 3 years of operation of the car

The gasket is selected according to the type of the old one. You cannot install a gasket made of a different material or with a change in shape - it will not be able to provide an adequate joint between the parts of the mechanisms.

The gasket replacement procedure is not difficult:

1. A new gasket is placed on the carburetor mounting studs.
2. Before this, you need to clean the planting site from soot and dirt.
3. It is necessary to install the gasket in the same position as the old one.
4. Then install the carburetor on it and tighten the fixing nuts until they stop.

DIY adjustment

Each car owner of a “six” or “seven” has the ability to adjust the carburetor independently. Adjustment work can enhance the dynamic qualities of the car, as well as reduce gasoline consumption. Undoubtedly, these are important indicators for any car owner, so you should be responsible when adjusting the carburetor.

Preparatory stage

Before you start work, you need to prepare thoroughly. This stage is necessary to ensure that nothing distracts the driver during setup and configuration.

First, it is recommended to prepare your work area. The carburetor must be installed on a flat and hard surface; it is better to stock up on rags in advance, as gasoline leaks are possible. In addition, it is necessary to ensure that the room in which the adjustment is planned is well ventilated and has high-quality lighting.

The second point of preparation is the set of necessary tools. You will need to prepare in advance a set of wrenches and two screwdrivers - a Phillips and a flathead with a narrow blade.

Next, find the service book for your car. It is there that the operating parameters are indicated, which will need to be checked during adjustment.

Attention! Adjustment work is carried out only after the carburetor has been washed, worn elements have been replaced and the device has been installed on the engine.

How to enrich or lean the mixture

Enriching or depleting the air-fuel mixture must be done at engine idle speed:

1. Start the engine and wait until it warms up to its operating temperature.
2. Tighten the fuel quality and quantity screws until they stop.
3. Next, unscrew each screw 3 turns back.
4. Referring to the idle speed data given in the VAZ service book, set the required number of revolutions by adjusting the screws in one direction or another.
5. That is, the principle of adjusting the mixture is to set the idle speed recommended by the manufacturer by reducing or increasing the enrichment of the mixture (quality screw) and reducing/increasing the amount of mixture (quantity screw).

At the bottom of the tube there is a quality screw, and a little to the right in a tube of smaller diameter there is a quantity screw

How to reduce gasoline consumption

The main element in a carburetor is the float. After you have adjusted the enrichment/leanness of the mixture, the float will invariably return to its axis. However, it may be slightly higher than normal - in this case, fuel consumption will increase. In addition, adjusting the float is also necessary in order to reduce the toxicity of gas emissions, since due to poor-quality sealing of VAZ cars, some gases can enter the cabin.

Adjustment of the float mechanism is carried out on a completely cooled motor. In order to get to it, you will need to remove the air filter box and unscrew the carburetor cap:

1. The float tongue needs to be adjusted.
2. The float stroke should correspond to the recommended value of 8 mm. If on a VAZ 2106/2107 this value is greater, fuel consumption increases; if it is lower, losses in dynamics appear.
3. Adjusting the clamps and axle fastenings allows you to set the desired stroke.
4. Then you need to install the cover on the carburetor and screw the filter box into place.

The following article will help you adjust the carburetor on a NIVA car:

Adjustment of the float tongue is ensured by screws and clamps

Carburetor VAZ 2107 operating principle

To carry out maintenance work you will need:

• A set of standard keys;
• Screwdrivers;
• Pliers;
• Rags;
• Carburetor cleaner (“Carb Cleaner” or equivalent);

You will also need a repair kit for the carburetor. Various types of repair kits are available, some of which include only gaskets, while others include all parts (jets, screws, emulsion tubes, etc.). It is better to purchase a complete set.

Since the carburetor consists of many small parts, disassembling it into its component parts, washing and troubleshooting and tuning is carried out in stages so as not to lose sight of anything.

The principle of operation of the carburetor is simple. Its task is based on creating an air-fuel mixture, mixing air and fuel in the required proportions, after which this mixture enters the combustion chamber, where it is ignited. The “Seven” carburetor includes the following devices that ensure distribution of the fuel mixture:

1. XX engine support.
2. Acceleration pump.
3. Maintain a stable fuel level.
4. Econostat system.
5. Support for starting and warming up the internal combustion engine.
6. The main metering chamber, where there are air and fuel jets, a diffuser, a well, a VTS sprayer, and an emulsion tube.