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Figure 14. Carburetor: 1. Carburetor heating unit. 2. First chamber throttle valve; 3. Crankcase gas suction pipe; 4 Accelerator pump drive lever; 5. Accelerator pump drive cam; 6. Accelerator pump diaphragm; 7. Fuel jet of the power mode economizer; 8. Pump body; 9. Diaphragm of the power mode economizer; 10. Shut-off electromagnetic valve; 11 Idle fuel jet; 12. Carburetor cover; 13. Main air jet of the first chamber; 14. Air damper; 15. Accelerator pump nozzles with fuel supply valve; 16. Diaphragm of the starting device; 17 Starter adjustment screw; 18. Idle mixture quantity adjusting screw; 19. Second camera lock lever; 20. Pipe for supplying vacuum to the vacuum regulator of the ignition distributor; 21. Idle mixture quality adjusting screw; 22. Throttle control sector; 23. Throttle actuator lever; 24. Adjusting screw for opening the throttle valve of the first chamber; 25. Air damper control lever; 26. Starter rod; 27. Electric wire of the forced idle economizer limit switch; 28. Choke lever; 29. Main air jet of the second chamber; 30. Emulsion tube; 31. Sprayer of the main dosing system of the second chamber; 32. Fuel supply pipe; 33. Fuel drain pipe into the tank; 34. Fuel filter; 35. Needle valve; 36. Second chamber throttle valve; 37. Second chamber throttle lever; 38. Main fuel jet of the second chamber; 39. Second chamber throttle actuator lever; 40. Float.
The carburetor is an emulsion type with a falling flow, two-chamber with sequential opening of the throttle valves. The carburetor has a balanced float chamber, heating of the throttle valve zone of the first chamber at the outlet of the fuel emulsion with air from the idle system, blocking of the second chamber when the air valve is not fully open.
The carburetor has two main metering systems, a transition system and an idle system with an electromagnetic shut-off valve of the first chamber, a transition system of the second chamber, an economizer, a power mode economizer, a diaphragm accelerator pump, a diaphragm starting device. In addition, the electromagnetic shut-off valve 10 and the limit switch of the adjusting screw 18 of the amount of idle mixture of the carburetor in a set with an electronic control unit and the electric wires connecting them make up the economizer of forced idle.
The carburetor is installed on the intake pipe using four studs and secured with nuts.
The second chamber lock has a lever 19 with a pin and a spring, mounted on the lever 23 of the throttle valve drive in a hinged manner. If the air valve 14 is not fully open, the lock does not allow the throttle valve 36 of the second chamber to open, excluding the possibility of the second chamber operating.
The throttle and air valve control drive is cable-operated. The throttle valves are opened by a pedal in the body interior. The upper end of the pedal lever is connected by a cable to sector 22 of the throttle valve control. The cable is placed in a sheath.
The article is taken from an online resource [www.vazbook.ru]
The air damper 14 of the carburetor is controlled by a handle located under the instrument panel in the passenger compartment. The handle is connected by a rod to the air damper control lever 25.
Note: The marking of the jets is determined by the flow rate, which is measured using micrometers. The micrometers are adjusted using reference jets.
Carburetor calibration data
* — the conditional fuel jet consumption is determined by reference jets using a special method. Not subject to control during operation.