Adjusting the idle speed gas 53. Features of K126 carburetors

Adjusting the GAZ-53 carburetor

The GAZ 53 carburetor has a two-chamber system, each of which operates on 4 cylinders. The throttle valve is equipped with a drive for both chambers at once, so fuel is dosed synchronously to all cylinders. To ensure rational fuel consumption at different engine modes, the carburetor is equipped with several systems for regulating the composition of the fuel mixture (FM).

This is what the carburetor installed on a GAZ 53 looks like

The GAZ-53 is equipped with a K-135 carburetor. The carburetor has a balanced float chamber. It is capable of simultaneously opening the throttle valves.

The carburetor was originally brand K126B, and its subsequent modification was K135 (K135M). Fundamentally, the models are almost no different, only the control circuit of the device has changed, and in the latest releases it was removed from float chamber convenient viewing window. Now it has become impossible to see the gasoline level.

Device

K-135 is emulsified, with two chambers and a falling flow.

The two chambers are independent of each other; through them, the combustible mixture is supplied to the cylinders through the intake pipe. One chamber serves cylinders 1 to 4, and the other serves all the others.

The air damper is located inside the float chamber and is equipped with two automatic valves. The main systems used in the carburetor operate on the principle of air braking of gasoline, except for the economizer.

In addition, each camera has its own system idle move, main dosing system and sprayers. The two carburetor chambers have in common only a cold engine starting system, an accelerator pump, partly an economizer, which has one valve for two chambers, and a drive mechanism. The jets located in the nozzle block and related to the economizer are installed separately on them.

Each idle system includes fuel and air jets, and two holes in the mixing chamber. A screw with a rubber ring is installed on the bottom hole. The screw is designed to regulate the composition of the combustible mixture. And the rubber seal prevents air from penetrating through the screw hole.

The air jet, in turn, plays the role of emulsifying gasoline.

The idle system cannot provide the required fuel consumption in all engine operating modes, so in addition to it, a main metering system is installed on the carburetor, which consists of diffusers: large and small, fuel and air jets and an emulsified tube.

Main dosing system

The basis of the carburetor is the main metering system (abbreviated as GDS). It ensures a constant composition of the vehicle and does not allow it to become lean or rich at medium engine speeds internal combustion(ICE). Each chamber in the system is equipped with one fuel and one air jet.

Idle system

The idle system is designed to ensure stable engine operation at idle speed ICE. The carburetor throttle valve should always be slightly open, and the gasoline mixture at idle speed (idle) enters the intake tract, bypassing the GDS. The position of the throttle axis is set by the quantity screw, and the quality screws (one for each chamber) allow you to enrich or lean the mixture at idle. The fuel consumption of the vehicle largely depends on the adjustment.

Float chamber

The float chamber is located in the main body and maintains the level of gasoline in the carburetor necessary for the normal operation of the engine power system. The main elements in it are a float and a locking mechanism, consisting of a needle with a membrane and a valve seat.

Economizer

The economizer system enriches the vehicle at high engine speeds with increasing load. The economizer has a valve that, when opened at maximum throttle valves releases a portion of additional fuel through channels bypassing the GDS.

Acceleration pump

In the K126 (K135) carburetor, the accelerator is a piston with a cuff that operates in a cylindrical channel. At the moment of sharp pressing of the accelerator (gas) pedal, the throttle valve drive, mechanically connected to the accelerator system, causes the piston to quickly move along the channel.

Diagram of the K126 carburetor with the names of all elements

Fuel is injected from the channel into the carburetor diffusers through a special sprayer, and the vehicle is enriched. The accelerator pump allows you to smoothly transition from idle to high speeds and allow the vehicle to move without jerks or dips.

Speed limiter

The system does not allow exceeding a certain number of revolutions crankshaft due to incomplete opening of the throttle valve. The operation is based on pneumatics; due to the vacuum, the diaphragm in the pneumatic valve of the device moves, turning the throttle valve axis mechanically connected to the limiter assembly.

Starting system

The starting system ensures stable operation of a cold engine. The system consists of pneumatic valves located in the air damper and a system of levers that connect the throttle and air damper. When the choke cable is pulled, the air damper closes, the rods pull the throttle along with them and open it slightly.

When starting a cold engine, the valves in the air damper open under the influence of vacuum and add air to the carburetor, preventing the engine from stalling with a mixture that is too rich.

Carburetor malfunctions

There can be many different malfunctions in the carburetor of a GAZ 53 car, but all of them are associated with increased fuel consumption, regardless of whether the mixture enters the cylinders rich or lean. Besides increased consumption fuel the following symptoms of malfunctions are characteristic:

It's coming black smoke from the exhaust pipe. It is especially noticeable with a sharp increase in engine speed. In this case, shots may be fired into the silencer;
The engine is unstable at idle and may also stall at idle;
The engine does not develop speed, chokes, there are popping sounds. intake manifold;
At sharp acceleration V internal combustion engine operation failure occurs;
Sluggish acceleration of the car, but at high speeds the car drives normally;
Lack of power, engine does not develop speed;
Jerks when moving, especially noticeable when accelerating.

Carburetor repair for GAZ 53 truck

Any of the carburetor systems can be faulty, but most often the following occurs:

Repairing a carburetor first of all involves flushing and purging all systems. To do this, the carburetor is removed and disassembled to clean all the jets.

Adjustment

The K126B carburetor (also the K135 carburetor) has several adjustments:

idle move;
gasoline level in the float chamber;
piston stroke of the accelerator pump;
moment when the economizer system is turned on.

Only one adjustment is made without disassembling the carburetor itself - this is idling the engine. This procedure is performed most often; any driver can perform it. It is better to entrust the remaining adjustments to specialists, but there are often craftsmen who make any adjustments with their own hands.
For proper adjustment, the XX engine must be technically sound, all cylinders must work without interruption.

Idle speed adjustment:

with the engine turned off, tighten the quality screws of both chambers until the end, then unscrew each approximately 3 turns;
start the engine and warm it up to operating condition;
use the quantity screw to set the number of revolutions XX to approximately 600. There is no tachometer in the GAZ 53 car, so the revolutions are set by ear - they should not be too low or high;
we tighten one of the screws for quality and torque until interruptions in the operation of the internal combustion engine appear, then we move the screw back approximately one-eighth of a turn (until stable operation of the engine);
We do the same with the second camera;
use the quantity screw to set the required speed;
If necessary, use the quality screw to increase the speed if the engine stalls when you release the gas pedal.

Buying a K135 carburetor is not a problem - it is sold in many auto stores. True, the price for such a device is rather high - about 7000-8000 rubles. K126B can no longer be found in stores; it has long been discontinued. But they are often sold through advertisements, and you can buy a practically new carburetor (2500-3000 rubles). A repair kit for the K135 model costs on average 250-300 rubles.

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GAZ-53 engine power supply system

The GAZ-53 power system (Fig. 1) consists of fuel tank, fuel line, sump filter, filter fine cleaning fuel, fuel pump, carburetor, air filter, intake pipe and carburetor control system.

Fig.1. Fuel system (power system) GAZ-53

1, 18, 28 - fuel lines; 2 - fuel tank; 3 - pin; 4 - mesh filter; 5 - gasket; b - aluminum washer; 7 - screw; 8 - fuel intake pipe with flange; 9 - spring; 10 - filter cups; 11,14 - tubes; 12, 26 clamps; 20, 13-hoses; 15 - carburetor; 16 - fine fuel filter; 17 - tube; 19 - fuel pump; 21 - bracket; 22 - tube coupling; 23 - union nut; 24 - tube; 25- clamp screw; 27 - clamp nut The GAZ-53 fuel tank, stamped from two halves and welded along the flanges, is made of leaded steel sheet. Refill capacity fuel tank 90 l. The remaining fuel that is not produced does not exceed 0.5 liters. The drain plugs of the fuel tanks are equipped with a device that allows them to be sealed to ensure the safety of the fuel. The locking device of the plugs also has holes for installing seals.

The fuel tank of the GAZ-53 car is located under the cab floor and is attached to the car frame using brackets and clamps with gaskets. On the upper half of the tank there are flanges on which a flange with a fuel intake pipe 22 and a fuel level indicator sensor 4 are installed.

The lower half of the tank has drainer , which is closed by plug 21 with a conical thread. The filler neck 1 of the GAZ-53 fuel tank is attached to the cabin by means of a stepladder and a lining is connected to the tank nozzle with a rubber molded (oil- and petrol-resistant) hose 24. To ensure that the tank is filled with fuel, an air outlet tube is soldered into the filler neck, which is also connected to the air tube 19 with a rubber hose 29. Hose connections are tightened with clamps. The filler neck is closed with a plug, which is attached and pressed to the neck by means of three plate spring straps. The connection is sealed with a rubber (oil and petrol resistant) gasket. For normal operation of the fuel tank, the filler plug is equipped with inlet (air) and outlet (steam) valves. The exhaust valve opens at a pressure of 0.39 - 1.62 kPa, the intake valve - at a vacuum in the tank of 0.44 - 3.53 kPa. The GAZ-53 fuel line consists of a suction line and a discharge line. Fuel lines 1 and 28 (see Fig. 1) from fuel tank 2 to fuel pump 19 (suction line), as well as tube 24 included in pipeline 28, are made of brass tubes with an outer diameter of 10 mm. Fuel lines 18, 17 and tubes 11, 14 (discharge line) are made of brass tubes with an outer diameter of 8 mm. The thickness of the tube walls is 0.8-1.0 mm. An increase in the diameter of the GAZ-53 fuel line on the suction line to 10 mm is caused by improved operation of the power system under conditions of high (35 ° C or more) ambient temperatures. The connection points of the GAZ-53 fuel lines to the fittings of the sediment filter, fuel pump, fine fuel filter and carburetor are sealed using conical couplings 22 and union nuts 23. The fuel lines are attached to the car frame using brackets 21. In order to compensate for engine vibrations relative to the frame at the fuel line connection point An oil and petrol resistant rubber hose 20 with an internal braid is installed to the fuel pump, the connection of which to the brass tubes is sealed with clamps 26 with a screw 25 and a nut 27. The fuel intake pipe has a strainer 4 with a brass mesh No. 016 (1420 cells per 1 cm2). The flange of the fuel intake pipe, as well as the fuel level sensor, is sealed with oil- and petrol-resistant rubber gaskets 5 and secured with five screws 7 (for each), under the heads of which aluminum sealing washers are installed. Fuel filter-settler GAZ-53 (Fig. 2). The sediment filter is installed on the left side member of the vehicle. Filter with a plate filter element and a stamped steel housing (sump bowl).

Fig.2. Settlement filter GAZ-53

1 - cover gasket; 2-cover; 3- coupling bolt with gasket; 4 - fuel supply fitting; 5 - filter element gasket; 6 - filter element; 7 - racks (two); 8 - settling tank body; 9 - conical plug; 10 - outlet fitting; 11 - filter element plate; 12 - holes for fuel passage; 13 - protrusions on the plate; 14 - holes (two) for racks; 15-spring; 16 - element washer; 17 - upper plate of the filter cover 2 is made of cast iron. The filter housing with stand assembly is connected to the cover 2 by means of a bolt 3. A paronite gasket 1 is installed between the housing and the cover. Inside the housing of the GAZ-53 filter-settler, a filter element 6 is installed on a rod, consisting of 170 ring-shaped aluminum plates 11 with a thickness of 0.15 mm . The plates are assembled on two racks 7 and are clamped by a spring 15 between the washer 16 and the plate 17. At the same time, the spring presses the filter element 6 against the filter cover 2. A gasket 5 is placed between the plate and the lid. The plates 11 of the filter elements have holes 12, which coincide for all plates and thus form a series of vertical channels, as well as two rows of stamped protrusions 13 0.05 mm high, thanks to which gaps are formed between the plates , equal to the height of the protrusions. Thus, the filter element can trap particles larger than 0.05 mm. The GAZ-53 gasoline pump (Fig. 3), type B9D, diaphragm, mechanically driven by an eccentric mounted on the engine cam shaft, is attached with two bolts to the timing gear cover on the front right side of the engine. A paronite gasket 0.6 mm thick is installed between the flange of the GAZ-53 fuel pump and the mating area of the cover. The housing of the GAZ-53 (B9D) fuel pump contains: diaphragm 6 assembled with upper 7 and lower 5 cups, sealed to rod 16 with a copper washer; seal 3 with a steel holder and spring 15 located on it, pump drive lever with axle, bushing 20 and spring 18, manual drive lever 1 with roller assembly 17 and return spring. The axis of the lever 21 of the floating type is sealed in the housing on both sides with threaded plugs. The manual drive roller is sealed in the housing with an annular rubber seal. In the head 8 of the GAZ-53 gasoline pump, which has a suction and discharge cavities, two inlet 9 and one discharge 14 valves are installed by pressing the holder. The valve consists of a holder made of zinc alloy, a rubber valve and a brass plate, pressed by a spring (made of bronze wire) 3. The valve plate is designed to prevent valve distortion in the absence of fuel in the GAZ-53 fuel system. Above the inlet valves in head 8 (see Fig. 3) a mesh filter 10 is installed, made of brass mesh No. 016, rolled into a frame. The head cover 12 is attached to the head 8 with two screws 11. A petrol-resistant rubber sealing gasket 13 is installed between the cover and the head. To prevent hot oil and crankcase gases from entering the diaphragm from the engine, there is an oil- and petrol-resistant rubber seal 5 on the diaphragm rod 16. A steel ring is installed on top of the seal (holder), into which the lower end of the spring 15 rests. Two thrust washers 2 are installed under the forked end of the lever 19 on the diaphragm rod 16: the lower one is steel, and the upper one is textolite. The washers are installed before landing the end of the rod. To control fuel leakage when the diaphragm breaks or its seal is broken at the point of attachment to rod 16, there is a control hole in the GAZ-53 fuel pump housing with a strainer 4 installed in it. Working surface lever 19, made by stamping from a steel sheet, in contact with the eccentric of the engine cam shaft, is subjected to nitrocarburization and hardening to a hardness of 45-58. After long periods of parking, you should use a manual pumping device to fill the carburetor with fuel.

Fig.3. Gasoline pump GAZ-53

The GAZ-53 fine fuel filter (Fig. 4) is attached to a bracket installed on the engine in front of the carburetor.

Fig.4. Fine fuel filter GAZ-53

1 - body; 2 - gasket; 3 - filter element; 4 - spring; 5 - settling glass; 6 - rocker arms; 7-wing nut; 8 - glass holder; 9 - frame of the filter element; 10 - filter element mesh; 11 - mesh presser spring The filter element is of a collapsible design, including: an aluminum frame of element 9 with ring grooves machined into its walls, inside of which holes are drilled for the passage of fuel, a brass filter mesh 10 (1400 cells per 1 cm), which is in two layers wrapped around the frame, and a spring 11, pressing the mesh to the frame. Housing 1 of the GAZ-53 filter is injection molded from zinc alloy. The plastic settling cup is made of phenolic plastic. The filter element 3 is pressed against the housing 1 by a spring 4, resting against the settling bowl 5. Between the filter housing, the settling bowl and the filter element, a combined gasket 2 molded from oil and petrol resistant rubber is installed. On some cars, a fine fuel filter with a ceramic filter element was installed instead of a mesh one. . Unlike a mesh filter, this filter, in addition to the filter element, is distinguished by the use of two separate gaskets between the housing and the settling glass, as well as the housing and the filter element, instead of one (combined) for the mesh filter. The GAZ-53 air filter (Fig. 5) is an inertia-oil type designed to clean the air entering the engine.

Fig.5. Air filter GAZ-53

1 - filter element with cover assembly; 2 - screw securing the filter to the carburetor; 3 - gasket (rubber); 4 - washer; 5 - carburetor; 6 - air guide pipe; 7 - gasket; 8 - crankcase gas outlet hole; 9 - gasket; 10 - pipe for crankcase gas drain pan; 11- filter housing; 12 - packing of the filter element The GAZ-53 air filter consists of two main non-separable units: filter housing 11 with a specially stamped oil bath and a pan with a pipe for the ventilation system, and filter element 1 with a cover assembly. Intensively twisted and heat-fixed nylon threads with a diameter of 0.23 - 0.3 mm are used as packing 12 of the filter element. The activity of the oil bath lies in the fact that when the engine load increases, the high-speed air flow captures and delivers oil from the oil bath to the packing, which, splashed throughout its entire volume, actively participates in cleaning the air from dust. The filter is attached to the carburetor 5 with screw 2 and an additional bracket to prevent carburetor breakdowns. Intake pipe of a GAZ-53 car (Fig. 6). The single-tier pipe (with the inlet channels arranged in one row) is cast from aluminum alloy. In addition to its main purpose - supplying the combustible mixture from the carburetor to the engine cylinders - it simultaneously serves as a cover for the cavity of the pushers, as well as a housing for the full-flow oil filter.

Fig.6. Intake pipe GAZ-53

1, 34, - exhaust manifolds; 2 - fitting to the water pump, 3 - hose; 4, 5, 6 - hose clamp; 7 - bypass fitting; 8 - inlet pipe; 9 - thermostat; 10 - nut; 11 - boss; 12 - cockpit heater; 13 - plug; 14 - gasket; 15 - outlet pipe; 16, 17, 18 - parts for fastening the pipe; 19 - pipe mounting studs; 20 - washer; 21 - coolant and engine temperature indicator sensor; 22, 23 - studs for fastening the intake pipe; 24 - stud for fastening the cargo nut: 25 - washer; 26 - special cargo nut; 27, 29. 36 - intake pipe gaskets; 28 - gasket exhaust manifolds; 30, 31, 32, 33 - studs with nuts and washers for fastening the exhaust manifolds; 35 - generator heat-protective casing. The pipe inlet channels are divided into right and left rows. The right row is fed from the right chamber of the GAZ-53 carburetor and connects it to the 1st, 2nd, 3rd and 4th cylinders of the engine; the left one connects the left chamber of the carburetor to the 5,6, 7 and 8 cylinders of the engine. To ensure a more uniform distribution of vacuum in the channels of the left and right rows, the jumper separating the rows has three connecting balancing holes: one in the area under the carburetor and the other two in the front and rear parts. To heat the combustible mixture, the intake pipe has a cavity connected to the engine water jacket. The coolant flows through the connecting channels from the engine heads, washes the inlet pipes and, through the outlet pipe in which the thermostat is installed, enters the radiator or, when the thermostat is closed, into the water pump. At the tide of the pipe in the area where the coolant exits into the outlet pipe there is a boss with a conical threaded hole into which a fitting 7 is screwed, connecting the water cavity of the pipe with the GAZ-53 water pump to ensure the bypass of coolant when the thermostat valve is closed. Between the pipe and the heads, as well as the pipe and the engine block, there are four rubber gaskets: two side, front and rear.

Carburetor K-135

The K-135 carburetor (Fig. 7) is an emulsion, two-chamber with a falling flow, with simultaneous opening of the throttle valves and a balanced float chamber. The K135 carburetor of the GAZ-53 engine differs from the K-126 carburetor in its adjustment parameters. Installed with the simultaneous introduction of cylinder heads with screw inlet ports onto the engine. Without changing the adjustment parameters, the use of the K-135 carburetor on engines with conventional, previously produced cylinder heads is unacceptable.

Fig.7. Diagram of the K-135 carburetor of the GAZ-53 engine and the speed limiter sensor

1 - accelerator pump; 2 - float chamber cover; 3-air jet of the main system; 4 - small diffuser; 5 - idle fuel jet; 6 - air damper; 7 - accelerator pump nozzle; 8 - calibrated economizer sprayer; 9-discharge valve; 10-air idle jet; 11- fuel supply valve; 12 - mesh filter; 13 - float; 14 - sensor valve; 15 - spring; 16 - sensor rotor; 17 - adjusting screw; 18 - viewing window; 19 - plug; 20 - diaphragm; 21 - limiter spring; 22 - throttle valve axis; 23 - limiter vacuum jet; 24 - gasket; 25 - restrictor air jet; 26 - cuff; 27 - main jet; 28 - emulsion tube; 29 - throttle valve; 30 - idle speed adjustment screw; 31 - mixing chamber housing; 32 - bearings; 33 - throttle valve drive lever; 34 - accelerator pump check valve; 35 - float chamber body; 36 - economizer valve From each chamber of the GAZ-53 carburetor, the combustible mixture is supplied independently of the other through the inlet pipe to its own bank of cylinders: the left chamber of the carburetor (along the car) supplies the combustible mixture to cylinders 5, 6, 7 and 8, the right one to 1 ,2,3 and 4 cylinders. In the cover of the float chamber of the K135 (GAZ-53) carburetor there is an air damper 6 with two automatic valves. The air damper drive is connected to the throttle valve axis by a system of levers and rods, which ensure that, when starting a cold engine, the valves are opened to the angle necessary to maintain the starting speed of the engine crankshaft. This system consists of lever 5 (Fig. 8) of the air damper drive, which with one arm acts on the lever of the air damper axis 6, and with the other on the lever of the accelerator pump drive, connected to the throttle valve lever by rod 2.

Fig.8. Adjusting the K-135 (GAZ-53) carburetor for the opening angle of the throttle valves with the air damper closed (cold engine start)

1 - throttle lever; 2 - traction; 3 - adjustment bar; 4 - accelerator pump drive lever; 5 - air damper drive lever, 6 - air damper axis The main systems of the K135 carburetor operate on the principle of pneumatic (air) braking of gasoline. The economizer system works without braking like a simple carburetor. An idle system and a main metering system are located in each carburetor chamber. The accelerator pump and cold engine starting system are common to both carburetor chambers. The economizer has a common economizer valve for both chambers and separate nozzles connected to each chamber. The idle system of each chamber of the K135 carburetor consists of a fuel jet 5 (see Fig. 7), an air jet 10 and two holes in the mixing chamber: upper and lower. The lower hole is equipped with a screw 30 to regulate the composition of the combustible mixture. The idle screw is sealed with a rubber ring to prevent air leaks. There is a knurling on the screw head to allow installation of a screw rotation limiter, ensuring the consistency of the adjusted qualitative composition of the mixture. Emulsification of gasoline is ensured by an air jet 10. The main dosing system consists of a large and small 4 diffusers, an emulsion tube 28, a main fuel jet 27 and an air jet 3. The idle system and the main metering system ensure the required gasoline consumption in all main engine operating modes. The K135 carburetor economizer includes parts both common to both chambers and separate to each chamber. The first includes the drive mechanism and the economizer valve 36 with a nozzle, and the second includes the nozzles located in the nozzle block (one for each chamber). Acceleration pump 1 with a mechanical drive consists of a piston, a drive mechanism, 34 return and 9 discharge valves and 7 nozzles in the block. The nozzles are located in each carburetor chamber and combined with jets and economizer nozzles in separate block. The accelerator pump and economizer are driven jointly. It is carried out from the axis of 22 throttle valves. The cold start system of the GAZ-53 engine consists of an air damper 6 with two automatic valves and a system of levers connecting the air and throttle dampers. Operation of the GAZ-53 carburetor when starting a cold engine. When starting a cold engine, the fuel mixture must be enriched. This is achieved by covering the air damper 6 (see Fig. 7) of the carburetor, which creates a significant vacuum at the nozzles of the main metering systems in small diffusers and at the outlet openings of the idle system in the mixing chamber. Under the influence of vacuum, gasoline from the float chamber of the K135 carburetor (GAZ-53) through the main fuel jets 27 flows to the emulsion tube 28 and idle jets 5. Through the air jets 3 of the main dosing system and the holes in the emulsion tubes 28, as well as through the air jets 10 of the idle system, air enters the channels, which, when mixed with gasoline, forms an emulsion. The emulsion, through the nozzles of small diffusers 4 and the outlets of the idle systems, enters the mixing chambers of the carburetor and then into the engine intake pipe. Over-enrichment of the combustible mixture after starting the engine with the air damper 6 closed is prevented by automatic air valves of the K-135 (GAZ-53) carburetor, which, when opening, let in additional air and lean the mixture to the required limits. Further leaning of the mixture is achieved by opening the air damper 6 from the driver's seat. When the air damper 6 is completely closed, the throttle valves 29 automatically open slightly at an angle of 12°. Operation of the GAZ-53 carburetor at low crankshaft speed during engine idle mode. At low frequency rotation of the engine crankshaft in idle mode, the throttle valves 29 (see Fig. 7) are slightly open at an angle of 1-2°, and the air damper 6 is fully open. The vacuum behind the throttle valves reaches 61.5-64.1 kPa. This vacuum is transmitted through the holes covered by the adjusting screws 30 of the idle system through channels to the fuel jets 5 of the idle system. Under the influence of vacuum, gasoline from the float chamber of the K-135 (GAZ-53) carburetor, passing the main jets 27, enters the mixing chamber through the fuel jets 5 of the idle system, along the way mixing with air entering through the air jets 10 of the idle system. At low engine speeds, air also enters through the upper transition holes of the idle system. Coming out of the idle holes, the emulsion is additionally sprayed into the mixing chamber by air passing at high speed through a narrow gap formed by the wall of the mixing chamber and the throttle valves 29. The combustible mixture thus obtained enters the engine intake pipe. In this mode, the vacuum at the nozzles of the main dosing system in small diffusers 4 is insignificant, so the main dosing systems do not work. Operation of the K-135 (GAZ-53) carburetor at partial loads. At low loads, the required mixture composition is provided only by the idle system, and at partial loads - by the joint operation of the main metering systems and the idle system. Operation of the K-135 (GAZ-53) carburetor at full engine load. To obtain maximum engine power, the throttle valves 29 (see Fig. 7) of the carburetor must be opened completely. 5 - 7° before the throttle valves are fully opened, the economizer valve 36 opens and the additional amount of gasoline entering through the system enriches the fuel mixture to the limits that ensure maximum power. The economizer system operates on the principle of a basic carburetor. During operation, gasoline flows from the float chamber to the power nozzle located in the economizer valve body 36, and then to a separately located nozzle block having nozzles in addition to the nozzle of the main dosing system. A separate output of the economizer of the GAZ-53 carburetor allows for timely (at approximately 1500 min-1 of the engine crankshaft with the throttle valves fully open) entry into operation of this system, which is necessary for the correct flow of external speed characteristics engine. The main dosing system also continues to operate at this time. Through the idle system in mode full loads The engine receives a very small amount of gasoline. When accelerating a car, the operation of the K-135 (GAZ-53) carburetor is ensured by injecting an additional portion of gasoline into the air flow. Injection is carried out by an accelerator pump through nozzles 7 (see Fig. 7). When the throttle valves 29 are sharply opened, the piston of the accelerator pump 1 moves down. Under gasoline pressure, check valve 34 closes, and the discharge valve opens and an additional amount of gasoline is injected into the air flow through nozzles 7. When the throttle valves of the GAZ-53 carburetor are slowly opened, gasoline has time to flow from the sub-piston cavity into the float chamber through the gap between the piston and the walls of the accelerator pump cylinder. Only a small part of the gasoline, when opening the injection valve 9, enters the air flow. Valve 9 and air passing through the holes to relieve vacuum from the nozzle prevent gasoline from suction through the accelerator pump system when the engine is running at a high engine speed in a constant mode. The remaining systems of the K-135 (GAZ-53) carburetor operate as usual. The GAZ-53 carburetor (Fig. 9) is controlled by a pedal 8 with a rubber pad 1, the bracket 5 of which is fixed to the cabin floor, and by the drive lever traction system. Additionally, there is a rod 31 for manual control of the throttle valves and a rod 16 for manual control of the air damper.

Fig.9. Control of the GAZ-53 carburetor on the GAZ-53 engine

1 - pedal pad; 2 - pedal lever axis; 3 - bolt (two) securing the pedal bracket; 4 - plastic bushings; 5 - pedal bracket; 6 - gasket; 7 - rubber bushing; 8 - pedal; 9, 10, 11 - rods with articulated ends; 12 - spring; 13 - tension spring bracket; 14 - adjusting screw; 15 - cracker; 16 - air damper rod; 17 - screw; 18 - seal insert, 19 - rod seal; 20 - tip; 21 - ball pin; 22 - compensator rod; 23 - nut; 24 - compensator spring; 25 - compensator body; 26 - compensator rod lever; 27, 37 - bolts; 28 - rod clamp screw; 29 - bracket for clamping the shell of the manual control rod of the carburetor; 30 - shell clamp; 31 - carburetor manual control rod; 32 - rod clamp screw; 33 - finger; 34 - carburetor manual control lever; 35 - in the roller boom; 36- drive roller bracket; 38 - drive shaft Adjustment of the GAZ-53 carburetor for a minimum stable rotation speed at idle is carried out by sharply opening the throttle valve and releasing gas. The engine should not stall. If the engine stalls, you need to slightly increase the rotation speed by screwing in the stop screw, and then check again for correct adjustment. The K-135 carburetor is adjusted for the moment the economizer is turned on with the float chamber cover and gasket removed. By pressing your finger, bar 1 (Fig. 10) is set so that the distance between it and the plane of the float chamber is in the range of 14.8 - 15.2 mm. In this case, using the adjusting rod nut 2, the gap between the end of the nut 2 and the bar 1 is set within the range of 2.8 - 3.2 mm. After adjustment, the nut should be tightened. It is necessary to ensure that the throttle and air dampers turn completely freely and tightly cover their channels without any jamming. Allowed gaps between housings and dampers are no more than 0.06 mm for throttle dampers and 0.2 mm for air dampers. Permissible gaps are checked with feeler gauges. To check the operation of the accelerator pump, measure its performance, which should be at least 12 cm3 per 10 full piston strokes. The rolling rate should be 20 full swings/min. The accelerator pump should operate smoothly and without jamming. In this case, pay attention to the sensitivity of the accelerator pump. This means that the supply of fuel through the accelerator pump nozzle must begin simultaneously with the start of the throttle valves. The permissible delay is no more than 5°. If the delay is greater, you should select a new piston for the accelerator pump well or replace the rubber seal of the piston due to their wear. If the pump performance is less than the specified value, this means that the valves (return or discharge) are not tight or the sprayer is clogged. This damage can be eliminated by washing and purging the nozzle and valve seats, as well as wiping them (if necessary).

Fig. 10. Adjusting the GAZ-53 carburetor for the moment when the economizer valve is turned on

When adjusting the K-135 carburetor to the required opening angle of the throttle valves with the air damper completely closed, proceed as follows (see Fig. 8). Having loosened the fastening of the movable bar 3, located on the lever 4 of the accelerator pump drive, use the lever 5 to completely close the carburetor air damper. Next, use lever 1 to open the throttle valves slightly so that the gap between the wall of the mixing chamber and the edge of the valve is 1.2 mm (this gap corresponds to the opening angle of the valves equal to 12°), and move the movable bar 3 until it rests against the protrusion lever, after which it is secured. Having opened and closed the air damper again, check the correct adjustment of the K-135 carburetor by measuring the above gap. The low crankshaft rotation speed during engine idle mode in the K-135 carburetor is regulated using two mixture quality screws 2 (one for each chamber) and one thrust screw 1 of the throttle valves (mixture quantity screw).

Moreover, when tightening each screw 2, the mixture becomes leaner, and when unscrewing, it becomes richer. The mixture quantity adjusting screw regulates the minimum throttle opening at which the engine runs stably without load.

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Carburetor repair and adjustment

Hello dear friends! Today we will talk to you about the K-135 carburetor, which is installed on Gas trucks, with gasoline engine ZmZ-511 and modifications. The carburetor - as practice shows, is an extremely important part of the entire fuel system in engines that use gasoline as fuel. It is the carburetor that creates the fuel mixture that enters directly into the combustion chambers.

Therefore, if the carburetor has not been adjusted correctly, fuel entering the engine fuel mixture will cause significant damage to it and lead to excessive fuel consumption. Modern devices, for example, injectors, can automatically regulate the quality of the supplied fuel, however, adjusting the GAZ 3307 carburetor still remains a hot topic for most people.

Gas brand trucks are equipped with K-135 carburetors. All carburetors from the time the K-135 was created were created using a single system. The carburetor consists of two chambers and throttle valves connected to them, one per chamber. The chambers are complemented by screws; by turning them, you can adjust the quality of the fuel mixture formed in the carburetor. In carburetors, the fuel mixture is supplied in such a way that the engine is not subject to filling with gasoline, and it is easier to start it in difficult conditions, such as cold weather, for example, an accelerator system.

Adjusting the GAZ 3307 K-135 carburetor is a relatively simple process, but you can only start it if you have at least a basic understanding of the design and principles of carburetor adjustment. For example, there is no point in restricting the fuel supply to the carburetor without lowering the air supply level. Yes, in general there is no need to limit the supply of fuel and air, since, as practice shows, this does not lead to anything good. You may save some money, but this will lead to premature wear engine, resulting in expensive repairs, so there is no need to limit anything, the manufacturer has set the standard, let everything remain that way.

Carburetor adjustment.

Let's start cleaning and adjusting the K-135 carburetor. I repeat, if you do not have at least a basic understanding of the design and principles of carburetor adjustment, it is better not to bother, but if you are sure that you can handle it, then we will continue. Although if you follow the advice, then I think everything will work out for you.

First of all, of course, you need to remove the carburetor and completely disassemble it. When disassembling, it is easy to carry dirt inside the carburetor or break worn-in connections or seals. External washing done with a brush using any liquid that dissolves oily deposits. This can be gasoline, kerosene, diesel fuel, their analogues, or special washing liquids dissolved in water. After washing, you can blow air over the carburetor, or simply blot it lightly with a clean cloth to dry the surface. The need for this operation is small, and it is not necessary to wash surfaces just for the sake of shine. To flush the internal cavities of the carburetor, you will need to at least remove the float chamber cover.

Removing the float chamber cover must begin by disconnecting the economizer drive rod and accelerator pump. To do this, you need to unpin it and remove it from the hole in the lever. top end thrust 2 (see Fig. 1). Then you should unscrew the seven screws securing the float chamber cover and remove the cover without damaging the gasket. To make the cover easier to remove, press the air damper lever with your finger. Move the cover to the side and only then turn it over the table so that the seven screws fall out. Evaluate the quality of the gasket. There should be a clear imprint of the body on it. Under no circumstances should you place the carburetor cover on the table with the float down!

1 - throttle lever; 2 - traction; 3 - adjustment bar; 4 - accelerator pump drive lever; 5 - air damper drive lever; 6-axis air damper.

Cleaning the float chamber is carried out to remove sediment that forms at its bottom. With the cover removed, you need to remove the bar with the accelerator pump piston and economizer drive and remove the spring from the guide.

Next, clean the float chamber from sediment and rinse with gasoline. It is better not to scrape off dirt that has already become embedded and stuck to the walls; it does not pose a danger. The likelihood of clogging of channels or jets with improper cleaning is much greater than with normal use.

The source of debris in the float chamber is, of course, gasoline itself. The reason for the inclusion of debris with gasoline is clogged fuel filters. Check the condition of all filters, replace and clean if necessary. In addition to the fine filter, which is installed on the engine and has a mesh or paper filter element inside, there is another one on the carburetor itself. It is located under the plug near the gasoline supply fitting on the carburetor cover. Another one, a sediment filter, stands near the gas tank and is attached to the frame; it also needs to be washed and cleaned.

After you are done with cleaning, you will need to remove all the jets. It’s better to try not to confuse the jets, because instead of one jet you won’t be able to screw in another, but still put it back where you removed it.

Main fuel jets.
The main air jets, under them in the wells there are emulsion tubes.
Econostat valve.
Idle fuel jets.
Idle air jets. Unscrew by touch with a slotted screwdriver after the fuel has been removed.

The most important thing: after removing all the jets, do not forget to get the needle valve that is located in the channel of the accelerator pump, otherwise there is a high probability of losing it. (Some don't even know about its existence). To do this, carefully turn the carburetor over the table and the valve will fall out. It is made of the same material as the jets, that is, brass. In the photo, with a comment, you can see where it is installed.

After removing the jets, you need to flush all the channels. For this purpose, there are special cans of liquid for flushing the carburetor. They are sold in auto parts stores, so it is not difficult to buy. You need to spray the liquid into all carburetor channels with this can and leave it for a while (there are instructions on the can). After some time, you need to blow out all the carburetor channels with compressed air. You need to blow carefully so that any remaining liquid does not get into your eyes. After blowing everything needs to be wiped with a dry cloth and dried. Also, do not forget to clean and bleed all jets. Just do not clean the jets with metal wire under any circumstances.

Also check the condition of the accelerator pump, pay attention to the rubber seal on the piston and the installation of the piston in the housing. The cuff must, firstly, seal the injection cavity and, secondly, move easily along the walls. To do this, there should be no large marks (folds) on its working edge and it should not swell in gasoline. Otherwise, friction against the walls may become so difficult that the piston may not move at all. When you press the pedal, you act through the rod on the bar that carries the piston, the bar moves down, compressing the spring, and the piston remains in place. And fuel injection will not happen.

Now everything needs to be put back together in reverse order. After assembly, you will need to correctly set the fuel level in the float chamber. In old-style carburetors, it’s convenient to have a window; you set exactly half of the window and that’s it. The level is adjusted by bending or bending the special tendril of the float. But in the new model carburetors there is no window, you will have to use some tools. (see Fig. 2.) And once again I want to say, do not under any circumstances try to save money by reducing the fuel level in the float chamber, this will not lead to anything good. But expensive repairs will be inevitable.

Rice. 2. Scheme for checking the fuel level in the float chamber:

1 - fitting; 2 - rubber tube; 3 - glass tube.

Idle speed adjustment.

The minimum engine speed at which it operates most stably is adjusted using a screw that changes the composition of the combustible mixture, as well as a thrust screw that limits the extreme position of the damper. (See Fig. 3.) Idle speed is adjusted with the engine warmed up to operating temperature (80°C). In addition, all parts of the ignition system must be in good condition, and the clearances must comply with the passport data.

First, you need to tighten the two screws for adjusting the quality of the mixture completely, and then turn them out 2.5-3 turns. Start the engine and use the thrust screw to set the average crankshaft speed. After this, using quality screws, it is necessary to increase the rotation speed to 600 rpm. If the carburetor is adjusted correctly, then when the throttle is opened sharply, the engine should not stall, there should be no dips and should quickly pick up maximum speed.

1- quantity screw; 2- quality screws; 3- safety caps.

I think this is where I can end the article. If suddenly you haven’t found something, or you simply don’t have time to search, then I recommend reading the articles in the “GAS Repair” categories. I am sure you will find the answer to your question, and if not, write in the comments the question you are interested in, I will definitely answer.

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GAZ-53

» GAZ 53 engine » Carburetor K-126 and K-135 of the GAZ-53 car: device and diagram

The two-chamber, emulsion carburetor K-126 (K-135) of the GAZ-53 car with a balanced float chamber and simultaneous opening of the throttle valves serves to prepare a combustible mixture of both air and fuel. The K-135 model differs from the K-126 carburetor only in adjustment parameters and began to be installed on the car after the introduction of cylinder heads with screw inlet ports to the engine. It is not allowed to use the K-135 carburetor on early engines without changing the adjustment parameters.

From each chamber of the carburetor, the combustible mixture flows independently of each other through the inlet pipe to the corresponding bank of cylinders: the right chamber of the carburetor supplies the combustible mixture to cylinders 1, 2, 3 and 4, and the left chamber supplies the combustible mixture to cylinders 5, 6, 7 and 8.

GAZ-53 carburetor diagram: 1 - accelerator pump; 2 - float chamber cover; 3 - air jet of the main system; 4 - small diffuser; 5 - idle fuel jet; 6 - air damper; 7 - accelerator pump nozzle; 8 - calibrated economizer sprayer; 9 - discharge valve; 10 - idle air jet; 11 - fuel supply valve; 12 - mesh filter; 13 - float; 14 - sensor valve; 15 - spring; 16 - sensor rotor; 17 - adjusting screw; 18 - viewing window; 19 - plug; 20 - diaphragm; 21 - limiter spring; 22 - throttle valve axis; 23 - limiter vacuum jet; 24 - gasket; 25 - limiter air jet; 26 - cuff; 27 - main jet; 28 - emulsion tube; 29 - throttle valve; 30 - idle speed adjustment screw; 31 - mixing chamber housing; 32 - bearings; 33 - throttle valve drive lever; 34 - accelerator pump check valve; 35 - float chamber body; 36 - economizer valve.

Carburetor design

The float chamber cover contains an air damper equipped with two automatic valves. The air damper drive mechanism is connected to the throttle valve axis using systems of rods and levers, which, when starting a cold engine, open the dampers to the angle required to ensure the optimal starting speed of the engine crankshaft. This system consists of an air damper drive lever, which acts with one shoulder on the damper axis lever, and with the other shoulder on the accelerator pump drive lever, which is connected to the throttle valve lever using a rod.

The main components of the carburetor operate on the principle of air (pneumatic) braking of gasoline. The economizer works without braking as a simple carburetor. The main metering system and the idle system are present in each carburetor chamber.

The cold engine starting system and the accelerator pump are common to both chambers of the carburetor. The economizer has a common economizer valve for two chambers and different nozzles that have an outlet into each chamber.

The idle system of both chambers of the carburetor consists of fuel and air jets, and also has two holes in the mixing chamber: lower and upper. The lower hole is equipped with a screw designed to adjust the composition of the combustible mixture. To prevent air from being sucked into the idle screw, a rubber O-ring is used. The screw head is equipped with knurling to allow installation of a screw rotation limiter, which ensures regular quality of the combustible mixture composition. The air jet ensures emulsification of gasoline.

Adjusting the opening angle of the throttle valves with the air damper closed (starting a cold engine): 1 - throttle valve lever; 2 - traction; 3 - adjustment bar; 4 - accelerator pump drive lever; 5 - air damper drive lever; 6 - air damper axis.

The main dosing system consists of a small and large diffuser, main air and fuel jets and an emulsion tube. The main dosing system and the idle system provide the necessary fuel consumption for the GAZ-53 car in all main engine operating modes. The economizer includes parts both common to both chambers and individual to each. The first includes an economizer valve with a jet and a drive mechanism, and the second includes jets located in the nozzle block (one per chamber).

Carburetor accelerator pump K-126

The accelerator pump, equipped with a mechanical drive, consists of a drive mechanism, a piston, discharge and check valves and nozzles in a block. The nozzles are located in each carburetor chamber and are combined with the nozzles and economizer jets into a separate block. The accelerator pump and economizer have a joint drive, carried out from the axis of the throttle valves.

The cold starting system includes a choke with a lever system and two automatic valves connecting the throttle and choke.

Carburetor operation when starting a cold engine

When starting a cold engine, it is necessary that the combustible mixture be enriched and this is achieved by closing the carburetor air damper, which creates a serious vacuum at the nozzles of the main metering systems in small diffusers and at the outlets of the idle system in the mixing chamber. Under the influence of vacuum, gasoline from the float chamber is supplied through the main fuel jets to the emulsion tube and idle jets. Air enters the channels through holes in the emulsion tubes, air jets of the idle system and through the air jets of the main metering system, simultaneously mixing with air, thereby forming an emulsion. The emulsion is fed through the outlets of the idle systems and the sprays of small diffusers into the mixing chambers of the carburetor and then into the engine intake pipe.

To prevent over-enrichment of the combustible mixture after the engine starts, automatic air valves are used, which, when opened, supply additional air, thereby depleting the combustible mixture to the required level. Subsequent leaning of the mixture is carried out by opening the air damper from the driver's cabin. When the air damper is completely closed, the throttle valves are automatically opened at an angle of 12º.

GAZ-53 carburetor control diagram: 1 - pedal pad; 2 - pedal lever axis; 3 - bolt (two) securing the pedal bracket; 4 - plastic bushings; 5 - pedal bracket; 6 - gasket; 7 - rubber bushing; 8 - pedal; 9, 10, 11 - rods with articulated ends; 12 - spring; 13 - tension spring bracket; 14 - adjusting screw; 15 - cracker; 16 - air damper rod; 17 - screw; 18 - seal lining; 19 - rod seal; 20 - tip; 21 - ball pin; 22 - compensator rod; 23 - nut; 24 - compensator spring; 25 - compensator body; 26 - compensator rod lever; 27, 37 - bolts; 28 - manual throttle clamp screw; 29 - bracket for clamping the shell of the manual control rod of the carburetor; 30 - shell clamp; 31 - carburetor manual control rod; 32 - rod clamp screw; 33 - finger; 34 - growl manual control of the carburetor; 35 - roller bushing; 36 - drive shaft bracket; 38 - drive roller.

Carburetor operation at low crankshaft speed during engine idle mode

At low crankshaft speeds in idle mode, the throttle valves are slightly open at an angle of 1-2º, while the air damper is completely open. The vacuum behind the throttle valves increases to 61.5-64.1 kPa. This vacuum, passing through the holes covered by the idle system and adjusting screws, is supplied through channels to the fuel jets of the idle system. Under the influence of vacuum, gasoline from the float chamber, bypassing the main jets, is supplied through the fuel jets of the idle system into the mixing chamber, simultaneously mixing with air, which enters through the air jets of the idle system. In low crankshaft speed mode, air is also supplied through the upper transition holes of the idle system.

Coming out of the idle holes, the emulsion is further atomized by air in the mixing chamber, which passes at high speed through a narrow gap created by the throttle valves and the wall of the mixing chamber. The combustible mixture created in this way is supplied to the engine intake pipe. In this mode, the vacuum at the nozzles of the main dosing system in small diffusers is not serious, so the main dosing systems do not function.

Carburetor operation at partial engine loads

At light loads on the engine, the composition of the combustible mixture is formed only with the help of the idle system, and at partial loads - by joint efforts with the idle system and the main metering systems.

Operation of the K-126 carburetor at full engine load

To obtain maximum engine power, the carburetor throttle valves must be fully open. 5-7º before the throttle valves are fully opened, the economizer valve opens and the combustible mixture is enriched with an additional amount of gasoline supplied through the system. The economizer works on the principle of a simple carburetor.

During operation, gasoline is supplied from the float chamber to the power nozzle located in the economizer valve body, and then to a separately located nozzle block with nozzles, bypassing the nozzle of the main dosing system.

A separate output of the economizer ensures timely entry into operation of this system, which is necessary for stable operation of the external speed characteristics of the engine. The main dosing system also continues to operate. At full load, a small amount of fuel is supplied to the engine through the idle system.

During acceleration of the GAZ-53, the carburetor operates by injecting additional fuel into the air flow. Injection is carried out by an accelerator pump using nozzles. When the throttle valves are opened sharply, the accelerator pump piston tends downwards. Check valve it closes under the pressure of gasoline, and the injection valve opens and an additional portion of gasoline is injected into the air flow through nozzles.

When the throttle valves open slowly, fuel has time to flow from the sub-piston cavity into the float chamber through the gap between the walls of the accelerator pump cylinder and the piston. Only a small part of the fuel, when opening the discharge valve, mixes with the air flow.

The valve and the air passing through the holes to relieve vacuum from the nozzle block the suction of gasoline through the accelerator pump system while the engine is running at high crankshaft speeds.

Carburetor control (gas pedal)

The carburetor is controlled by a pedal equipped with a rubber pad, the mount of which is installed on the cabin floor, as well as by a system of levers and drive levers. Additionally, a manual control rod for the throttle valves and a manual air damper control rod are provided.

In any car, every detail is important and fulfills its intended role. The carburetor also has such functions. Being a device for dosing fuel and preparing a combustible mixture, it prepares the fuel in the cylinders for more complete combustion. All preparation usually consists of spraying liquid fuel into small drops and evaporating, mixing with air.

In GAZ-53 cars ZMZ engines-53 carburetor K-126 and K-135 are installed. If you compare the same parts that were once equipped with the ZIL-130 and Moskvich-412, you can see that they are very similar. The difference here is obvious in the dimensions and possibilities of its adjustment. This is precisely what determines some of the features that carburetors for the GAZ-53 have.

Types of carburetors K-126

Each carburetor has systems that help it function properly under certain conditions. There are also additions that help them function properly (for example, these include solenoids designed to cut off the fuel supply or pressure surge absorbers). It is not recommended to remove such components, as this will have a noticeable effect on engine operation.

So, any carburetor for GAZ-53 will consist of the following parts:

Float chamber;
Air damper;
Idle system;
Acceleration pump;
Transition system;
Main carburetor metering system;
Economizer.

K-126 carburetor diagram

System operation sequences

The work of each of the above components is a guarantee of excellent performance and the carburetor itself. For example, a float system maintains a constant fuel level in the float chamber. The air damper allows a cold engine to start by enriching the air-fuel mixture. The idle speed system ensures that the engine is getting the fuel it needs to keep the engine running at low revs when the dosing system is not yet operating. But the accelerator pump is designed to inject additional fuel to prevent stalling and interruptions in the engine during acceleration of the car (usually this happens when the throttle is opened sharply).

Next, it’s up to the transitional system. It is needed to enable the transition mode between idle and operation of the main dosing system. But the latter precisely forms the necessary gas-air fog, that is, the supply of fuel to the engine while the car is moving at average speeds.

And finally, when the engine is running under load, a richer air-fuel mixture is required than in normal operation. It is the economizer system that will provide additional fuel.

Design features of the K-126 model

The carburetor of the K-126 model of the GAZ-53 is a two-chamber part with a descending flow of the combustible mixture. It also has a mechanically driven economizer with an accelerator pump.

Its body consists of an upper, middle and lower part, each of which is connected with screws, and fuel will flow into the float chamber through a strainer. As a starting device, the K-126 carburetor has an air damper - it has an air valve, which is designed to prevent the formation of an enriched mixture at the moment when the engine starts. And each of the two cameras has its own autonomous idle system.

GAZ-53 carburetor size

How can you check the fuel level?

The most important condition for stable operation of the carburetor float is its free movement on the axis, and at the same time the tightness of the housing is important. Please note that the valve needle must move absolutely freely, without any jamming. And in those cases when they occur, the problem turns out to be a violation of the integrity of the float body - in this case, adjusting the fuel level in the float chamber will be almost impossible.

How to check the tightness of the float? This can be done by opening the carburetor, pulling out the float and immersing it in hot water. If air bubbles appear on the surface, this will indicate damage. To eliminate the malfunction, a puncture is made in this place and simply remove the remaining water and fuel from the float. After this, all that remains is to dry and solder the hole. Such adjustment of the float operation is impossible without taking into account its weight, which should not exceed 14 g (if it turns out to be more, you need to remove excess solder).

Adjusting the GAZ-53 carburetor