Disassembly and assembly of carburetors models 21051-1107010 and 21053-1107010 (VAZ-2105)

Disassembly

Loosen the screws securing the carburetor cover and carefully remove it from the body so as not to damage the gasket, float and tube of the second chamber transition system.

Disassemble the cover (Fig. 52) of the carburetor in the following order:

using a 3x24.5 mm mandrel, carefully push out the axis 13 of the float 15 from the posts and, without damaging the float tongues, detach it from the cover;
remove gasket 16, unscrew seat 4 of the needle valve;
unscrew the fuel supply pipe 7 and remove the fuel filter 5;
unscrew the housing 2 with the idle fuel jet and the electromagnetic shut-off valve 1, remove the jet;
unscrew the axle 11, take out the ball 9 with the spring, remove the air damper control lever 10, disconnect the air damper lever spring;
if necessary, unscrew the air damper mounting screws 6, remove the damper and axle 8 with the lever.

Fig. 52. Details of the carburetor cover 21051-1107010 and 21053-1107010:
1 - electromagnetic shut-off valve; 2 - housing with idle fuel jet; 3 - cork; 4 - carburetor cover; 5 - fuel filter; 6 - air damper; 7 - fuel supply pipe; 8 - air damper axis with lever; 9 - air damper control lever locking ball; 10 - air damper control lever; 11 - lever axis 10, 12 - air damper drive rod mounting bushing; 13 - float axis; 14 - seat with needle valve; 15 - float; 16 - gasket; 17 - diaphragm of the starting device with a rod; 18 - spring; 19 - adjusting screw; 20 - starter cover.

Disassemble the diaphragm starter by unscrewing the screws and removing cover 20 together with adjusting screw 19. Remove spring 18 and diaphragm 77 with rod.

Disassemble the carburetor body (Fig. 53).

Fig. 53. Body parts of carburetors 21051-1107010 and 2107-1107010:
1 - accelerator pump diaphragm; 2 - accelerator pump drive lever; 3 - lid; 4 - accelerator pump drive cam; 5 - power mode economizer cover; 6 - economizer diaphragm; 7 - fuel jet economizer; 8 - economizer valve; 9 - accelerator pump check valve; 10 - accelerator pump nozzles with fuel supply valve; 11 - sprayers of the main dosing systems; 12 - main air jets with emulsion tubes; 13 - main fuel jets; 14 - bracket for fastening the air damper drive rod casing; 15 - adjusting screw of the second chamber; 16 - adjusting screw stopper; 17 - Stopper cap; 18 - first chamber throttle valve opening adjusting screw; 19 - first chamber throttle shaft with drive levers; 20 - second chamber locking lever; 21 - locking lever spring; 22 - second chamber throttle valve axis; 23 - first chamber throttle valve; 24 - second chamber throttle valve; 25 - plug; 26 - return spring of the second chamber throttle actuator lever; 27 - adjusting screw for idle mixture quality (composition); 28 - carburetor body; 29 - idle mixture quantity adjusting screw; 30 - electrical wire with limit switch of forced idle economizer; 31 - carburetor heating unit.

To do this:

unscrew the fastening screws, remove the cover 3 of the accelerator pump with the lever 2 and the diaphragm 1;
remove the accelerator pump nozzles 10 and 11 and the nozzles of the main metering systems of the first and second chambers. Remove the accelerator pump nozzles 10 only by the nozzle housing;
unscrew the nut of the first chamber throttle shaft, remove the cam 4 of the accelerator pump drive and the washer. Unscrew the fastening screw and remove the electrical wire 30 with the forced idle economizer limit switch;
unscrew the idle mixture quantity adjusting screw 29. Remove the plastic plug 25 with a corkscrew and unscrew the idle mixture quality (composition) adjusting screw 27;
after unscrewing the fastening screws, remove the cover 5 of the power mode economizer, the diaphragm 6 and the spring;
unscrew the fuel jet 7 of the economizer. Unscrew the main air jets 12 with emulsion tubes and the main fuel jets 13 of the main metering systems;
if necessary, unscrew the screws securing the throttle valve 23 of the first chamber, remove the valve and the axle 19 together with the drive levers. After removing the lock washer and unscrewing the screws securing the throttle valve 24 of the second chamber, remove the valve and remove the valve axle. Remove the bearings of the axles of the throttle valves of the first and second chambers.

Assembly

Assemble the carburetor in the reverse order. Pay attention to the following:

the float should rotate freely on its axis without touching the walls of the chamber;
the needle valve should slide freely in its seat, without distortion or jamming;
before assembling the float chamber cover, adjust the fuel level in the float chamber;
to avoid mixing up the jets during assembly, pay attention to the markings on the jets and follow these instructions when installing them table 3;
after tightening the throttle valve mounting screws, use a special tool to secure the screws from loosening, preventing the valves from deforming;
when assembling the accelerator pump, tighten the cover fastening screws 3 by pressing the pump drive lever 2 until it stops, tighten the cover screws completely and release the lever 2.