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VAZ-2121 (1977-1994) VAZ-21213 (1994-2006) VAZ-21214 (1994-2006)
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  • The structure and description of the carburetor

The structure and description of the carburetor (VAZ-2121)

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Carburetors 2106-1107010 were installed on VAZ-2121 cars up to 1980. The number of these carburetors is cast on the lower flange of the carburetor body. Since 1980, carburetors 2107-1107010-20 are installed on VAZ-2121 cars together with a type 30.3706-02 ignition distributor (2121-3706010-10), having a vacuum regulator. On some vehicles, a 2107-1107010-10 carburetor can also be installed together with a conventional ignition distributor (without vacuum regulator). The number for these carburetors is indicated on a plate attached to the carburetor cover.

Carburetor 2106-1107010 emulsion type, two-chamber, with a falling flow. Has a balanced float chamber and a system for sucking crankcase gases behind the throttle valve (see fig. 2-81). The idle system is equipped with a throttle valve zone heater and an idle jet electromagnetic valve in the primary chamber (see fig. 2-82). A system of levers provides sequential opening of the throttle valves, and the air valve has a diaphragm starting device for starting a cold engine (Fig. 2-83). The accelerator pump (Fig. 2-84) is a diaphragm type, with a mechanical drive, delivers fuel to the primary chamber.

Fig. 2-81. Schematic diagram of the main metering system of the carburetor and economizer (the…

Fig. 2-81. Schematic diagram of the main metering system of the carburetor and economizer (the economizer sprayer is located in the secondary chamber of the carburetor. In the diagram it is conventionally shown in the primary chamber): 1 - emulsion jet economizer*; 2 - emulsion channel of econostat*; 3 - economizer air jet*; 4 - economizer air jet*; 5 - fuel jet economizer*; 6-needle valve; 7 - float axis; 8 - ball of the locking needle; 9 - float; 10 - float chamber; 11 - main fuel jet; 12 - emulsion well; 13 - emulsion tube; 14 - primary chamber throttle valve axis; 15 - spool groove; 16 - spool; 17 - large diffuser; 18 - small diffuser; 19 - Sprayer
* There are none on the 2106-11070i0 carburetor




Fig. 2-82. Idle system diagram of the 2106-1107010 carburetor: 1 - air jet; 2 - shut-off valve; 3 -…

Fig. 2-82. Idle system diagram of the 2106-1107010 carburetor: 1 - air jet; 2 - shut-off valve; 3 - fuel channel, 4 - emulsion well; 5 - throttle body; 6 - primary chamber throttle valve; 7 - screw-adjustable hole, 8 - transition mode holes, 9 - throttle body heating channel; 10 - adjusting screw; 11 - emulsion channel; 12 - additional air adjustment screw; 13 - carburetor body cover


Fig. 2-83. Schematic diagram of the starting device and throttle valve drive of the 2106-11070010…

Fig. 2-83. Schematic diagram of the starting device and throttle valve drive of the 2106-11070010 carburetors: 1 - air damper control lever; 2 - air damper 3 - air pipe of the primary chamber of the carburetor; 4 - traction; 5 - starting device rod; 6 - diaphragm; 7 - adjusting screw; 8 - cavity communicating with the throttle space; 9 - telescopic rod; 10 - primary chamber throttle valve adjusting screw; 11 - throttle control lever; 12 - sector; 13 - primary chamber throttle valve axis; 14 - lever on the primary chamber throttle valve axis; 15 - secondary chamber throttle valve axis; 16 - secondary chamber throttle valve; 17 - lever; 18 - carburetor body; 19 - lever; 20 - traction



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Fig. 2-84. Accelerator pump diagram: 1 - ball valve for feeding; 2 - sprayer; 3 - fuel channel; 4 -…

Fig. 2-84. Accelerator pump diagram: 1 - ball valve for feeding; 2 - sprayer; 3 - fuel channel; 4 - bypass jet; 5 - float chamber; 6 - accelerator pump drive sector; 7 - drive lever; 8 - pump return spring; 9 - diaphragm cup, 10 - pump diaphragm; 11 - Inlet ball valve; 12 - gasoline vapor chamber


Carburetor 2107-1107010-10 has different calibration data (see table 2-6), enrichment device (econostat), pneumatic drive of the secondary chamber throttle valve (Fig. 2-85) and a modified idle system (Fig. 2-86). These carburetors do not have throttle body heating. Carburetor 2107-1107010-10 is completely interchangeable with carburetor 2106-1107010 and can be installed instead of it on cars manufactured before 1987.

Fig. 2-85. Secondary chamber throttle valve drive diagram for carburetors 2107-1107010-10 and…

Fig. 2-85. Secondary chamber throttle valve drive diagram for carburetors 2107-1107010-10 and 2107-1107010-20: 1 - pneumatic drive jet located in the primary chamber diffuser; 2 - throttle valve drive lever; 3 - lever rigidly connected to the axis of the primary chamber throttle valve; 4 - lever limiting the opening of the secondary chamber throttle valve; 5 - pneumatic drive jet located in the secondary chamber diffuser; 6 - lever connected to lever 9 via a spring; 7 - secondary chamber throttle valve axis; 8 - pneumatic drive shield; 9 - secondary chamber throttle control lever; 10 - channel for supplying vacuum to the pneumatic drive; 11 - rod bushing; 12 - secondary chamber throttle valve pneumatic drive


Fig. 2-86. Idle system diagram for carburetors 2107-1107010-10 and 2107-1107010-20: 1 - throttle…

Fig. 2-86. Idle system diagram for carburetors 2107-1107010-10 and 2107-1107010-20: 1 - throttle body; 2 - primary chamber throttle valve; 3 - transient mode holes, 4 - screw adjustable hole; 5 - air supply channel; 6 - mixture quantity adjustment screw; 7 - mixture composition (quality) adjustment screw; 8 - emulsion channel of the idle system; 9 - additional air adjustment screw*; 10 - carburetor body cover; 11-idling system air jet; 12 - shut-off valve; 13 - idle system fuel channel; 14 - emulsion well.
* Mounted on carburetor parts


The 2107-1107010-20 carburetor differs from the 2107-1107010-10 carburetor by the modified diameters of some jets and the introduction of a branch pipe for supplying vacuum to the vacuum regulator of the ignition distributor. This carburetor can be installed instead of the 2106-1107010 carburetor on cars manufactured before 1980. But in this case, instead of the usual ignition distributor (without vacuum regulator) it is necessary to install an ignition distributor type 30.3706-02, which has a vacuum regulator.

The 2107-1107010-20 carburetor differs from the 2107-1107010-10 carburetor by the modified…


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The text was reviewed by the specialist: Grigory Vologodtsev

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Previous articles
VAZ-2121: Supply system
Next articles

Fuel tank — removal and installation
Installing a fuel pump on an engine
Checking the fuel pump
Fuel pump device
Air filter — removal and installation
Idle speed adjustment
Setting the fuel level in the float chamber
Adjusting the carburetor drive
Removal and installation a carburetor on a car
Disassembling the carburetor

More articles from other manuals on VAZ cars:
➠ The structure and operation of the carburetor VAZ-2109 (1984-1997)
➠ General structure and technical characteristics of the car VAZ-1111 (1988-1996)
➠ The structure of the Zhiguli cars VAZ-2101, VAZ-2102 and VAZ-2103 VAZ-2101 (1970-1983)
➠ The engine structure of VAZ-2104 and VAZ-2105 cars VAZ-2105 (1979-2010)
➠ The structure (layout) of VAZ-2106 and VAZ-2103 cars VAZ-2106 (1976-2006)
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VAZ-2121 (1977-1994) 
  • General information
  • Vehicle device
  • Car VAZ-21219
  • Power unit
  • Engine repair
  • Cooling system
  • Lubrication system
  • Supply system
  • Transmission
  • Clutch
  • Car gearbox
  • Transfer case
  • Cardan gear
  • Rear axle and gearbox
  • Front axle
  • Chassis
  • Front suspension
  • Rear suspension
  • Steering
  • Brake system
  • Body
  • Exterior
  • Interior
  • Doors and windows
  • Electrical equipment
  • Equipment and devices
  • Headlights and lighting
  • Engine electrics

 

VAZ-21213 (1994-2006) 
  • General information
  • Vehicle device
  • User manual
  • Power unit
  • Engine repair
  • Cooling and lubrication system
  • Supply system
  • Transmission
  • Clutch
  • Car gearbox
  • Transfer case
  • Cardan gear
  • Rear axle and shafts
  • Front axle and wheel drive
  • Chassis
  • Wheel suspension
  • Steering
  • Brake system
  • Body
  • Exterior
  • Interior
  • Electrical equipment
  • Engine electrics
  • Equipment and devices

 

VAZ-21214 (1994-2006) 
  • General information
  • Vehicle information
  • Troubleshooting
  • Power unit
  • Engine repair
  • Cooling system
  • Fuel system (carburetor)
  • Fuel system (injector)
  • Ignition system
  • Control system
  • Exhaust system
  • Transmission
  • Clutch
  • Car gearbox
  • Transfer case
  • Cardan gear
  • Front axle
  • Rear axle
  • Chassis
  • Front suspension
  • Rear suspension
  • Steering
  • Brake system
  • Body
  • Exterior
  • Interior
  • Doors, covers and windows
  • Ventilation and heating
  • Electrical equipment
  • Equipment and devices
  • Headlights and lighting
  • Engine electrics
  • Electrical circuits

 

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