Carburetor K-151: device control, features, design, and reviews

At the dawn of the release of the models of cars GAS and UAZ-31512 with power units were installed, the carburetors of the series To-126. Later, these engines were equipped with elements of the series K-151. These carburetors are manufactured JSC «Pekar”. In the process of their operation and private car owners and businesses were faced with difficulties for repair and maintenance. The fact that the design of the carburetor K-151 was significantly different from previous models. While information about the specifics of the design were very poor.

General data about the units 151-series

Structurally, the elements of the series K-151 are distinctly different from all other domestic carburetors, although their components and some systems are designed on the basis of typical schemes. Depending on the release time units in this series and had several design options. Below we consider the features of the carburetor K-151.

Device information

The Unit has two adjacent vertical channel. They are necessary for the intake of oxygen. At the bottom of each channel is the throttle. Each of them is the chamber of the carb. The actuator on the throttle is designed in such a way that as the pedal has been depressed initially open one valve and then another. The camera, the shutter which has previously called primary.

In the middle part of each of the channels for the passage of air, there is a special restriction in the shape of a cone. This diffusers. Why the need for these items? Due to them creating the effect of dilution on the basis of which the fuel from the float is drawn into the system. Need to carb the fuel level in the chamber is maintained by means of a special mechanism with a needle valve and float. We'll cover that in more detail.

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Float with the lower fuel feed

It Should be noted that the carburetor K-151 this mechanism is fundamentally different from the same in any other domestic units. In this regard, the owners having trouble with your service. On several occasions repeat reviews. By the way, I installed this object on the old engines from ZMZ.So, the system together with the float and needle valve accommodated in the housing of the device. Visual control over the operation of the mechanism is possible only after removing the cover. It will not be disturbed by the natural interaction of the float with the fuel level. This is a camera with a lower pitch.

Device

So, consider in more detail the carburetor K-151. Device carburetor repair features described below. The element is arranged in three parts. The top – Cabinet cover, equipped with a flange, and studs for mounting the air filter with a venting device float chamber and with the elements of the starting system. Last through seven screws attached to the case using a paper strip.

In the carb there is a middle part. This is directly the body of the device, which built a float mechanism, the chamber and the fuel feed fitting. Also included is a dosing system. The lower part of the device includes a housing for a throttle actuator together with the actuator, the device is idle, which is attached to the body via the gasket.

With Float mechanism

When the fuel chamber is less than the need, the float goes down, thereby freeing the needle. Due to this open section and is provided by the flow of gasoline. As the chamber will be filled, the needle valve closes.

Together with the change in the flow rate of fuel through the needle valve in automatic mode, it also changes the flow of gasoline from the pump. This prevents the increase in pressure of the fuel entering the Assembly.

The fuel Level is never saved-it varies depending on the operating mode of the engine. Thus, the maximum level will be at idle. When working at full power level is slightly reduced. This does not affect the efficiency of the device so as to be taken into account in the process of adjusting the proportioning system manufacturer.

Metering system

For the first chamber of the carburettor that for a second, the design of the dosing systems is the same. How is it arranged? Here are the main fuel nozzles, which are installed at the bottom of the float chamber and the main air jets. The latter are on the plane, in the upper part of the emulsion wells. Under the main air jets are also located in the emulsion tube. In the middle part of the emulsion wells there is a hole with a large cross-section. Latest special channels are connected with the output holes on the dispensers. They are located in small diffusers.

How to operate the metering system?

On the carburetor K-151 that operates as follows. Due to vacuum in the area of the spray holes of the fuel through the main fuel jet emulsion rises through the well and gets to the holes in the emulsion tubes. Then the gasoline is picked up by the air that passed through the Central tube. This creates a fuel mixture that goes through the side channels to the nozzles. Then all this will be mixed with the main air flow.

Additional devices in carburetor

In addition to these basic elements the carburetor also includes other mechanisms. So, the system idle is designed to maintain stable engine operation at speeds up to 1 thousand per minute. It consists of a bypass channel, adjustment screws, fuel and air nozzle valve of economizer.

The Accelerator pump allows the vehicle to move without failure and, if necessary, to sharply accelerate. The system consists of a valve main body, of a ball valve and membrane mechanism, and spray. In principle it resembles the work of the fuel pump.

Ekonostat – a device that allows you to enrich the fuel-air mixture at high engine speeds. Structurally, the element represents an additional channel through which due to vacuum during open throttle valves in the manifold gets fuel. The structure has the bridging system. They are needed for smooth growth of turnover in that moment, when the throttle valve of the second camera only started to open up. It is an air and fuel nozzle.

Faulty carb

During the operation process can see malfunction. So, a common problem – high fuel consumption, black smoke from the exhaust pipe with a sharp taps on the gas pedal, unstable idle, poor dynamic characteristics, jerks and failures. In this case the carburetor K-151 setup and repair.

Most Often among the reasons of breakdowns, you can select poor-quality fuel. Because of this, clogged nozzles, and air and fuel channels. In addition, because of the high temperature enclosure may be deformed. In use, the nozzles are subjected to natural wear and tear. Most of the masters, for which the structure and operation of the carburetor K-151 familiar, in the repair process try to change the nozzles. It is believed that due to their increasing fuel consumption, and the power unit may become unstable. But there is a caveat. If the nozzles wear out, it is quite rare.

Alignment

For those already familiar with the device similar units, it would be easy to service the carburetor K-151. Its elements, disassembly and setup in General are not much different from all the other carbs. To manually adjust the unit enough to understand the principle and follow the instructions. There are several settings for this device.

So, adjustment lend themselves to idle, the choke, the fuel level in the float chamber and the throttle position. To change the fuel level is only experienced masters but to set idle any car owner.

Step-by-Step adjustment of carburetor K-151 includes several stages. So, you need to warm up the engine to operating temperature, then allow it to run at idle when the air flap is open. Next, twist the screws of quality and quantity and allow the engine to achieve maximum revs. Then each screw gradually tightening as long as the engine is running, there will be no interruptions.

With the screw number Rev. Thus it is necessary to catch the position when the engine stabiliziruemost. It is desirable that the rotor was spun at maximum. Don't forget that this bolt affects the fuel consumption. Then rotate the screw quantity. These achieve stable engine operation at speeds in the range of 700-800 rpm. If the screw will be twisted excessively, then start failures at the sharp pressing on the gas. ...