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

Idle adjustment: the last stage of carburetor tuning

After setting up the float chamber and debugging the starting device, you can safely move on to the final stage, which allows you to adjust the engine idle speed. For this purpose, the carburetor design includes so-called quantitative and qualitative screws.

As in the case of debugging the starting mechanism, it is necessary to warm up the engine well beforehand. After this we perform the following steps:

• Using a high-quality screw, we set the maximum engine rotation speed;
• Let's move on to the quantity screw. Using it, you need to reduce the speed by about 100 rpm. After this, we start the power unit and continue to turn the screw to achieve the optimal level of engine speed.

Correct adjustment of the idle speed makes it possible to achieve stable operation of the engine, as well as eliminate possible malfunctions and failures. If your goal is also to increase power, you can make a number of changes to the design of the standard carburetor or replace it with a Solex-type device that functions more efficiently.

To tune the carburetor, work is carried out such as removing the spring from the vacuum drive, installing more efficient air and fuel jets, as well as installing a new diffuser marked 4.5 (instead of the standard 3.5). Such a simple modification makes it possible to significantly improve the performance of both the device itself and the car engine.

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

Relevance of carburetor adjustment

Do-it-yourself adjustment of the VAZ-2107 carburetor may be necessary in the following situations:

• A warm or cold engine does not start;
• maintenance carried out twice a year - before the winter and before the summer season;
• twitching of the car when starting off or after acceleration;
• unstable engine operation;
• severe dips when activating the gas pedal or dull response.

Adjustment is a mandatory measure in all of the cases mentioned; the procedure can be carried out even without removing the carburetor, however, when dismantling the device, the work is much easier. The best option for adjusting the carburetor, if it is not dismantled, is to adjust the idle speed.

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.

Cleaning, troubleshooting, checking the VAZ 2107 carburetor

For full service, the unit must be removed from the car. This is done by dismantling the air filter housing, disconnecting the pipes, tubes, cables and solenoid valve wires from the assembly. Afterwards all that remains is to unscrew the 4 nuts securing the carburetor to the intake manifold and remove the assembly.

The Ozone carburetor includes three parts. It is better to work with each of them one by one: remove one - disassemble, clean, reassemble and move on to the next component.

Carburetor cover

Let's start with the lid. Maintenance includes the following steps:

1. Unscrew the screws securing the cover.
2. Disconnect the telescopic air damper control drive.
3. Remove the cover from the housing along with the trigger and float.
4. Unscrew the screws securing the starting device and disconnect the rod from the damper axis lever.
5. We remove the float axis and remove the float along with the locking needle.
6. We unscrew the filter plug installed on the fuel supply fitting (if the plug does not unscrew, apply a few gentle blows to it with a wrench). Remove the filter element (mesh).
7. We remove the gasket.
8. We wash the lid from dirt. We blow out the channels in it using a cleaning agent (if you don’t have the product on hand, you can blow it with compressed air).
9. We wash and blow through the filter mesh. We put it in place and tighten the plug.
10. We examine the condition of the locking needle (the rubber cuff on it). We install the float with the needle in place.
11. Check the position of the float (affects the level in the float chamber). This is done like this: we turn the lid over vertically (so that the locking needle closes the feed channel) and measure the distance from the float in the surface of the lid. The distance is 6.5 mm, with this indicator the level corresponds to the norm. If it doesn’t fit, we adjust and adjust the position of the float by bending the tongue.
12. Check the tightness of the locking needle. To do this, turn the cap over with the float up and create a vacuum in the inlet fitting with your mouth (extract air from the fitting). If the locking needle “does not hold,” replace it.
13. Using vacuum, we check the integrity of the diaphragm of the starting device (when creating vacuum, the rod of the device must move). If necessary, we repair the starting device using a new membrane from the repair kit.
14. We install the starting device on the carburetor cover (replacing the sealing collar of the device), connect the rods and the telescopic drive.

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.

Preparing the carburetor for tuning

In order for carburetor adjustment to achieve maximum effect, we strongly recommend that you first perform the following steps:

• remove dirt from the outside of the device and rinse it well;
• perform troubleshooting of parts to ensure that there are no chips, cracks, deep scratches or other defects on their surface;
• clean the filter elements from dirt;
• thoroughly wash the float chamber and clean the air supply jets.

If you are completely confident in the serviceability of the carburetor and have thoroughly cleaned it of dirt, you can begin tuning, which is performed in several stages:

• setting the float mechanism;
• debugging a device designed to start an engine;
• idle speed adjustment.

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

Idle speed adjustment.

Idle speed is adjusted to ensure stable engine speed at idle with a minimum content of carbon monoxide (CO) and hydrocarbons (CH) in the exhaust gases. We recommend carrying out this operation at the “CO-CH” adjustment points.

Idle speed adjustment is carried out using a quantity screw, which reduces or increases the amount of fuel-air mixture entering the engine, and a quality screw, which regulates the air-fuel ratio.

We carry out the adjustment using a gas analyzer. The engine must be warmed up to operating temperature, the ignition and valves must be adjusted, and the choke must be fully open.

1. Using the quantity screw, we adjust the crankshaft rotation speed to 820–900 rpm;
2. Using the quality screw we achieve a CO concentration in the exhaust gases within 0.5–1.2%! at a given position of the quantity screw;
3. Again, use the quantity screw to adjust the crankshaft speed to 820–900 rpm;
4. If necessary, use the quality screw to adjust the CO concentration within 0.5–1.2%!