Device and adjustment of the carburetor K126G

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:41

The era of carburetor technology is long gone. Today, fuel enters the car's engine under electronic control. However, cars that have carburetors in their fuel system still remain. In addition to vintage cars, there are still quite working "horses" - UAZs, as well as classics from the Togliatti Automobile Plant. And that means that the ability to understand the device, carry out maintenance, repair the carburetor remains in price.

This article will focus on the K126G carburetor. Adjusting the K126G carburetor is a delicate undertaking that requires certain skills and a good knowledge of its composition and principles of operation. But first, let's remember a little about what a carburetor is in general.

About carburetor systems

So, what is a carburetor? Translated from French carburation - "mixing". From here, the purpose of the device becomes clear - to create a mixture of air and fuel. After all, it is the fuel-air mixture that is ignited by the spark of a car candle. Due to their simple design, carburetors are now used on low-power lawnmower and chainsaw engines.

There are several varieties of carburetors, but everywhere the main components will be a float chamber and one or more mixing chambers. The principle of the float chamber is similar to the valve mechanism of the toilet bowl. That is, the liquid enters to a certain level, after which the locking device is activated (for a carburetor, this is a needle). The fuel enters the mixing chamber through the atomizer along with air.

Carburetor is a fairly subtle device to set up. Adjustment of the K126G carburetor should be made at every maintenance and any problem. A correctly tuned air-fuel mixture supply unit ensures even engine operation.

K126G carburetor device

Carburetor K126G is a typical representative of the two-chamber version. That is, the K126G contains a float and two mixing chambers. And if the first works constantly, then the second starts to work only in dynamic modes with sufficient load.

The K126G carburetor, the device, adjustment and repair of which is described in this article, is quite popular for UAZ vehicles. The device is very unpretentious in operation and resistant to debris.

In the float chamber K126G there is a viewing window by which you can determine the fuel level. The carburetor incorporates several subsystems:

• idling;
• cold start;
• accelerator pump;
• economizer.

The first three work only in the primary chamber, and for the economizer system there is a separate atomizer, which is output to the air channel of the second chamber of the carburetor. The overall control of the device is carried out using the "choke" system and the accelerator pedal.

Applicability K126G

The carburetor marked "K126G" was installed and is still being serviced on Gaz-24 "Volga" and UAZ vehicles, with mainly UMZ-417 engines. UAZ car owners especially love this model for its unpretentiousness and ability to work even with clogged fuel.

With minor modification (drilling a hole), K126G is installed on UMZ-421 engines. And it can be both UAZ and Gazelle. K126G can be considered the predecessor of K151, and the next model is K126GM.

K126G carburetor adjustment is the most popular question among carburetors. But first, let's look at the various problems that can happen with K126G.

Possible malfunctions

All malfunctions of the described system are either visually visible or easy to check. One of the main problems isunstable operation of the engine at idle, or none at all. The K126G carburetor, whose fuel consumption adjustment is normal, allows the engine to idle without any problems.

The second point, which shows that the device is faulty and requires adjustment, is an increase in fuel consumption. There can be several reasons, so adjusting and adjusting the carburetor does not always help.

Solve the problem can be scheduled regular cleaning of all constituent elements. Incomplete cleaning is also possible with the carburetor not removed from the car, but it is undesirable. K126G, like any mechanical device, prefers good care.

K126G carburetor adjustment

The need to adjust the carburetor may arise for various reasons. This may be scheduled maintenance or troubleshooting issues. Moreover, a simple adjustment according to the instructions is quite simple to perform. The downside is that it does not always help in the decision. Experienced mechanics with extensive experience in carburetor repair do not take on the job without adjusting the valves.

In order for the air-fuel mixing device to function without interruption and it does not need to be constantly adjusted, timely maintenance is necessary. It is enough to make an elementary inspection for leakage and tightness and flush the carburetor at least partially. Sometimes it is necessary to check the fuel level in the float chamber, as well as the throughput of the jets, both fuel andair.

If we approach the issue systematically, then it is necessary to highlight the following types of carburetor settings:

• idling;
• fuel level in the float chamber;
• economizer valve.

Adjusting the K126G carburetor on a UAZ most often involves adjusting a specific idle speed. So, let's consider the sequence of actions to restore auto stability at idle.

Instructions for adjusting idle speed K126G

Adjusting the stability of the engine is carried out by two screws. One determines the amount of the fuel-air mixture, and the second determines the quality of its enrichment in K126G. Carburetor adjustment, the instructions of which are given below, is carried out in stages:

1. With the vehicle turned off, tighten the mixture enrichment screw until it stops, and then unscrew it by 2.5 turns.
2. Start the car engine and warm it up.
3. First screw to make the engine run smoothly and steadily at about 600 rpm.
4. With the second screw (enrichment of the mixture), gradually deplete its composition so that the engine continues to work stably.
5. With the first screw we increase the number of revolutions by 100, and with the second we decrease them by the same amount.

The correctness of the adjustment is checked by increasing the speed to 1500 and then closing the throttle. At the same time, the revolutions should not fall below the permissible values.

Adjustmentfuel level in float chamber

Over time, it may happen that the level of gasoline in the float chamber changes. Normally, it should fluctuate within 18-20 mm from the bottom surface of the connector, which is determined through the viewing window of the carburetor. If visually this is not the case, then it is necessary to make adjustments.

Changing the fuel level in the K126G chamber is carried out by bending the tongue of the float lever. This is done very carefully, trying not to damage the seal washer made of special gasoline-resistant rubber.

Variety of producers

Among the manufacturers of the K126G carburetor there were:

• Solex;
• "Weber";
• "Pekar".

Today, Pekar has won the greatest popularity. Users note in the reviews more stable operation, as well as high dynamic qualities with economical fuel consumption in the region of 10 liters per 100 km. It is worth noting that the Pekar K126G carburetor is adjusted in the same way as above.

Advantages and disadvantages of K126G

K126G carburetor is quite popular among UAZ owners. It is valued for a number of advantages that more modern models lack:

• steady operation in the presence of clogging;
• unpretentiousness to fuel quality;
• sufficient economy.

The K126G carburetor, whose mixture quality is regularly adjusted, will work without any problems. Simplicity of design -guarantor of reliability. In this case, it will, but subject to scheduled maintenance.

K126G has one unpleasant drawback. In case of overheating, the body of the device may be deformed. This occurs when the carburetor threaded connections are overtightened.

Conclusion

As experience shows, adjusting the K126G carburetor is not such a difficult question. And timely maintenance of the device will significantly extend its life. All this, together with the unpretentiousness of the K126G, attracts owners of carbureted cars.