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Fig. 11: 1. Carburetor heating unit. 2. First chamber throttle valve. 3. Crankcase ventilation pipe. 4. Accelerator pump drive lever. 5. Accelerator pump drive cam.. 6. Accelerator pump diaphragm. 7. Power mode economizer fuel jet. 8. Carburetor body. 9. Power mode economizer diaphragm. 10. Solenoid shut-off valve. 11. Idle fuel jet. 12. Carburetor cover. 13. Fuel supply pipe. 14. First chamber main air jet. 15. Air damper. 16. Accelerator pump nozzles with fuel supply valve. 17. Starter diaphragm. 18. Starter adjusting screw. 19. Idle mixture quantity adjusting screw. 20. Second chamber locking lever. 21. Pipe connected to vacuum regulator of ignition distributor. 22. Idle mixture quality adjusting screw. 23. Throttle drive lever. 24. First chamber throttle opening adjusting screw. 25. Air damper control lever. 26. Starter rod. 27. Electric wire of forced idle economizer limit switch. 28. Air damper lever. 29. Second chamber main air jet. 30. Second chamber emulsion tube. 31. Second chamber main metering system small diffuser. 32. Fuel filter. 33. Float chamber needle valve. 34. Second chamber throttle valve. 35. Second chamber throttle valve lever. 36. Second chamber main fuel jet. 37. Second chamber throttle valve drive lever. 38. Float.
On VAZ-2105 and VAZ-2104 cars from 1985-87, carburetors of model 21051-1107010 are installed. The calibration data of the carburetor are given in the table.
The carburetor has a balanced float chamber, a system for sucking crankcase gases behind the throttle valve, and a lock for the second chamber. The carburetor has two main metering systems of the first and second chambers, an idle system of the first chamber with a transition system, a transition system of the second chamber, an economizer of forced idle, an economizer of power modes, an economizer, a diaphragm accelerator pump with a mechanical drive, and a diaphragm starting device. Since 1988, the economizer has not been installed on carburetors 21051-1107010.
The carburetor consists of two body parts: the body 8 and the cover 12 of the carburetor. The cover is sealed with a gasket and fastened with screws to the body. The inlet necks of the first and second chambers, wells for supplying air to the main air jets, balancing holes connecting the float chamber with the cavity behind the filter element of the air filter are made in the carburetor cover. The air filter body is installed on four studs screwed into the cover 12. The air damper 15 of the starting device is installed in the inlet neck of the first chamber. Lever 28 with two pins is rigidly mounted on the axis of the air damper, one of which is fitted with a return spring. The second pin enters the shaped groove of lever 25 controlling the air damper. The lever 25 is mounted freely on the axis, screwed into the cover 12. A bushing is fixed on the lever 25, to which the air damper drive rod is attached with a screw. The adjusting screw 24 for opening the throttle valve of the first chamber and the pin of the lever 20 for locking the second chamber rest on the outer edge of the lever 25.
In the cover 12 of the carburetor, a needle shut-off valve 33 for fuel supply, a float 38, a fuel filter 32, a branch pipe 13 for supplying fuel to the float chamber are installed. The cover of the starting device with a diaphragm 17 assembled with a rod 26 is attached to the lug of the cover 12 with four screws. The channels of the economizer, the transition system of the second chamber, the idle system, and the starting device are made in the cover of the carburetor. The electromagnetic shut-off valve 10 with the idle fuel jet is screwed into the cover.
The required fuel level in the float chamber is ensured by the correct installation of serviceable elements of the shut-off device. The correct installation of float 38 is checked by a gauge, which is installed perpendicular to cover 12, which is held horizontally with the floats up. There should be a gap of no more than 1 mm between the floats and the gauge along the contour.
When adjusting the level, it is necessary to ensure that the mass of float 38 assembled with the lever is no more than 6.23 g, the float should not be damaged and should rotate freely on the axis.
Adjust by bending the tongue and float levers. The supporting surface of the tongue must be perpendicular to the axis of the needle valve 33 and have no dents or nicks.
Large diffusers are cast in the carburetor housing 8, small easily removable diffusers 31 are installed, cast together with the sprayers of the main metering systems. The housing contains the channels of the main metering systems, the idle system, the transition system of the second chamber, the economizer of power modes, the accelerator pump and the continuation of the channel of the starting device into the throttle space of the carburetor. In the housing 8, sprayers 16 of the accelerator pump with a ball valve, main air jets 14 and 29 with emulsion tubes 30 in emulsion wells, the intake tube of the transition system with a fuel jet are also installed. The main fuel jets 36 are screwed into the emulsion wells. The branch pipe 21 for feeding the vacuum ignition advance regulator hose and the branch pipe 3 for sucking crankcase gases, which is connected by channels and a calibrated hole with a diameter of 1.5 mm with the cavity behind the throttle valves, are pressed into the carburetor body. The calibrated hole does not have a noticeable effect on the depletion of the combustible mixture with closed throttle valves in idle mode. The adjusting screw for the completeness of throttle valve 34 of the second chamber closing, as well as the adjusting screw 19 for the amount of idle mixture with the electric drive 27 of the limit switch of the forced idle economizer are installed in the tides of the carburetor body. The adjusting screw 22 of the idle mixture quality is screwed into the housing; the screw secures the block 1 of the carburetor heater in the area of the throttle valve of the first chamber, through which the coolant of the engine cooling system passes.
The accelerator pump cover is attached to the lug of the housing 8, which forms the working cavity of the accelerator pump, with four screws, with the drive lever 4 assembled with the pump diaphragm 6. The cover of the power mode economizer with the working diaphragm 9 is also attached to the housing with screws. A spring acts on the diaphragm. The fuel jet 7 and the power mode economizer valve are installed in the carburetor housing under the diaphragm 9.
In the lower part of the housing 8, the throttle valves 2 and 34 of the first and second chambers are mounted on the axes. On the axis of the throttle valve of the first chamber, the following are mounted: the lever 23 of the throttle valve drive with the adjusting screw 24 for opening the throttle valve of the first chamber and with the lever 20 for locking the second chamber; lever 37 of the second chamber throttle valve drive; return spring and cam 5 of the accelerator pump. On the axis of the throttle valve of the second chamber, the lever 35 of the throttle valve is installed.
The second chamber lock prevents the second chamber throttle valve from opening in any engine operating mode unless the air damper is fully open. The lock prevents the second mixing chamber from operating when the engine is not warmed up. The lock lever 20 is pivotally mounted on the throttle valve drive lever 23.
The engine idle speed is adjusted by adjusting screws: screw 19 of the mixture quantity, which regulates the amount of opening of the first chamber throttle valve, and screw 22 of the mixture composition (quality). After adjustment, adjusting screw 22 is closed with a plastic plug.