Fig. 4.21. Scheme of a power supply system: 1 — the fuel tank; 2 — a fuel-supply line; 3 — the filter settler; 4 — the fuel pump; 5 — the filter of thin purification of fuel; 6 — the carburetor; 7 — a fuel discharge hose

The power supply system (fig. 4.21) consists of the fuel tank, fuel-supply lines, the fuel pump, the filter settler, the filter of thin purification of fuel, the carburetor with the drive throttle and air gates, the air filter.

Fig. 4.22. Fuel tank: 1 — a drain stopper; 2 — laying of a drain stopper; 3, 5 and 14 — laying; 4 — a tape; 6 — an arm of fastening of a tank to a frame; 7 — a flange of a fence and discharge of fuel with the filter; 8 — a spring; 9 and 11 — flanges; 10 — the filter; 12 — a pin; 13 — the sensor of the electric index of level of fuel

The fuel tank (fig. 4.22) — metal, with a filling volume of 70 l, is located on the left side on a frame longeron. The tank fastens to a longeron by means of arms, coupling tapes and hooks. Between arms, tapes and a tank cardboard laying is established. In the top part of a tank there is a toplivozabornik consisting of a tube and the filter in the form of a brass grid and also the sensor of the electric index of level of fuel. In the lower part of a tank the drain stopper is located.

Fig. 4.23. Bulk mouth of the fuel tank: 1 — a hose of a bulk pipe; 2 — a collar; 3 — an arm; 4 — a stopper of a bulk pipe; 5 and 6 — laying; 7 — an arm of fastening of a tank to a frame

The bulk pipe (fig. 4.23) is fixed on the left sidewall of a body and connected to a tank a rubber hose. The stopper of a bulk mouth has inlet and final steam-air valves. For removal of air when filling a tank with fuel the air tube serves. The inlet valve works at depression in a tank of 0,44 — 3,43 kPa, final — with a pressure of 0,39 — 1,62 kPa.

Fuel-supply lines are executed from brass tubes of the outer diameter of 8 mm. Tubes are connected to the fuel pump, a tank, the filter settler, the filter of thin purification of fuel and the carburetor by means of unions, conic couplings, cap nuts and flexible hoses with coupling collars.

The fuel-supply line 2 (see fig. 4.21) takes away surplus of fuel from the carburetor through a jet (in the carburetor union) with a diameter of 1,1 mm that improves work of a power supply system and launch of the hot engine in the conditions of high temperatures of air.

Fig. 4.24. Air filter: 1 — a branch pipe of ventilation of a case of the engine; 2 — a washer; 3 — a nut; 4 — the filtering element; 5 — a cover; 6 — a hose; 7 — an intaking branch pipe; 8 — the screen; 9 — a screen branch pipe; 10 — the filter case; 11 — laying; 12 — the carburetor; 13 — the expansion plug; 14 — a plate

The air filter (fig. 4.24) — dry type, with the replaceable filtering element from a porous cardboard, is installed on the carburetor through rubber laying. For reduction of noise of absorption of air the filter is supplied with the airintaking corrugated hose connected to the metal branch pipe located on a mudguard guard on the right. At a temperature of air below 5 °C for giving in the carburetor of the warmed-up air the airintaking hose needs to be disconnected from the branch pipe which is on a mudguard guard and to connect to a branch pipe of the screen installed on an exhaust pipe of the engine.

It is necessary to use the filtering elements having the following designations: 3102-1109013-02 (-03,-04,-05,-06) or 31029-1109013 (-01,-02,-03)

Fig. 4.25. Drive throttle and air gates: 1, 9 — arms; 2 — a bracket of fastening of draft of the air gate; 3 — a rope cover; 4 — a sealant; 5 and 18 — tips with epiploons; 6 — the coupling; 7 — the handle of draft of the air gate of the carburetor; 8 — the lever with the limiter; 10 — the lever with the roller; 11 — a pedal; 12 — a bracket of fastening of a rope; 13 — the sector of the lever of the drive of butterfly valves; 14 — the lever of the drive of the air gate of the carburetor; 15 — draft; 16 — a rope; 17 — adjusting nuts

The drive throttle and air gates (fig. 4.25) consists of a pedal, the rope connecting a pedal to the sector of the lever of the drive of butterfly valves, tips with epiploons, adjusting nuts, couplings and draft of the air gate of the carburetor with the handle located on the dashboard.

Control of butterfly valves is exercised by means of pressing an accelerator pedal. At full opening of butterfly valves the pedal has to rest against a floor rug. It prevents emergence of excessive tension in drive details. At release of a pedal butterfly valves have to return to a starting position.

Control of the air gate of the carburetor is exercised of the draft handle from a driver's seat. When the handle is in a starting position (it is pressed to the dashboard), the air gate has to be completely open. For closing of the air gate it is necessary to press a pedal and to extend the handle that will prevent breakage of draft of the air gate.

Fig. 4.26. Fuel pump: 1 — the lever of the manual drive; 2 — a sealant; 3 — the mesh filter of a control opening; 4 — the delivery valve; 5 — the screw of fastening of a cover of the filter; 6 — the mesh filter; 7 — the soaking-up valve; 8 — a diaphragm; 9 — the drive lever

The fuel pump B-9V (fig. 4.26) — diaphragm type, is put in action from the clown located on distributive to an engine shaft. The fuel pump consists of combined knots of the case with a diaphragm 8 and the lever of the drive 9, a head with valves 4 and 7 and covers. The diaphragm from four petals made of a lakotkana is clamped between the case and a head of the pump. Draft of a diaphragm is condensed with a rubber sealant 2. The valve consists of the holder made of the zinc alloy, the rubber valve and a brass shastana which are drawn in spring (from a bronze wire). Over the soaking-up valves of the pump the filter 6 manufactured of a small brass grid is installed. For filling of the carburetor with fuel at the idle engine the pump has the device for the manual drive. For control of tightness of a diaphragm in a pump housing there is an opening with the mesh filter 3.

Fig. 4.27. Fuel filter settler: 1 — a cover bolt; 1 — laying of the filtering element; 3 and 4 — unions; 5 — a washer; 6 — laying of a cover; 7 — a cover; 8 — an arm; 9 — the settler case; 10 — the element filtering; 11 — a spring; 12 — a spring washer; 13 — laying of a drain stopper; 14 — a drain stopper

The fuel filter settler (fig. 4.27) is installed on the left longeron of a frame before the fuel tank and intended for separation from fuel of water and mechanical impurity more than 0,05 mm in size. For discharge of a sediment in the bottom of the case of the filter there is a drain stopper. For cleaning of mechanical impurity the filter is supplied with the filtering element consisting of a set of metal plates.

Fig. 4.28. Filter of thin purification of fuel

Filter of thin purification of fuel (fig. 4.28) non-demountable. Designation of the filter — 1208-1117010-03 or 4021-1017010.

At installation of the filter it is necessary to watch that the direction of the movement of fuel coincided with the arrow applied on the filter case.

Fig. 4.29. Scheme of K-151, K-151D carburetors: I \the scheme of control of the economizer of compulsory idling (K-151 for ZMZ-D025,-4026); II \the scheme of control of the economizer of compulsory idling (K-151D for ZMZ-4061, 4063); 1 — the fuel valve; 2 — a float; 3 — a stopper; 4 — an air jet of transitional system; 5 — an emulsion jet of transitional system; 6 — the screw of fastening of a spray of an ekonostat of the second camera; 7 — a spray of an ekonostat of the second camera; 8 — an air jet of the main dosing system of the second camera; 9 — an emulsion tube of the main dosing system of the second camera; 10 — the small diffuser of the second camera; 11 — the final ball valve of the accelerating pump; 12 — a spray of the accelerating pump; 13 — the air gate; 14 — the small diffuser of the first camera; 15 — an air jet of the main dosing system of the first camera; 16 — an emulsion tube of the main dosing system of the first camera; 17 — the block of an air jet with an emulsion tube of system of idling; 18 — an emulsion jet of system of idling; 19 — an air jet of system of idling; 20 — the screw of factory adjustment of composition of mix; 21 — the main fuel jet of the first camera; 22 — a cap; 23 — a carburetor cover; 24 — the adjusting screw of restart-up of fuel of system of the accelerating pump; 25 — a displacer; 26 — the carburetor case; 27 — the inlet ball valve of the accelerating pump; 28 — a cover of the accelerating pump; 29 — a spring; 30 — the lever of the drive of the accelerating pump; 31 — a diaphragm of the accelerating pump; 32 — the electromagnetic valve; 33 — an electronic control unit; 34 — the controller; 35 — the microswitch; 36 — perepuskny a jet of the accelerating pump; 37 — a diaphragm of the economizer of compulsory idling; 38 — the valve of the economizer of compulsory idling; 39 — a restrictive cap; 40 — the screw of composition of mix; 41 — the case of the economizer of compulsory idling; 42 — the screw of operational adjustment of idling; 43 — a tube to the vacuum proofreader; 44 — a butterfly valve of the first camera; 45 — a cam of the drive of the lever of the accelerating pump; 46 — a roller of the lever of the accelerating pump; 47 — the case of butterfly valves; 48 — a butterfly valve of the second camera; 49 — a depression supply tube to the electromagnetic valve; 50 — the calibrated opening; 51 — laying; 52 — the main fuel jet of the second camera; 53 — a tube to the valve of system of recirculation of the fulfilled gases; 54 — a tube of a supply of crankcase gases; 55 — a toplivopodvodyashchy tube; 56 — a drain tube; 57 — the fuel filter

The K-151 carburetor (fig. 4.29) consists on three main demountable parts connected through the condensing laying by screws. The top part — a cover of the carburetor includes the air branch pipe divided into two channels with the air gate in the channel of the first camera. The middle part consists from float-operated and two mixing cameras and is the carburetor case. The lower part — the case of butterfly valves includes mixing branch pipes with butterfly valves of the first and second cameras of the carburetor. Laying between average and lower parts of the carburetor is sealing and heat-insulating.

Structurally the carburetor consists of two smesitelnny cameras — the first and second. Each of cameras of the carburetor has own main dosing system.

System of idling — with quantitative adjustment of constant composition of mix (autonomous system of idling).

In the second camera of the carburetor there is a transitional system with food fuel directly from the float-operated camera which enters work at the time of opening of a butterfly valve of the second camera.

The accelerating pump — diaphragm type. For enrichment of gas mixture at full loading in the second camera it is provided эконостат.

Fig. 4.30. Scheme of the semi-automatic device of start-up and warming up: 1, 5, 6, 16 — levers; 2 — a starting spring; 3 — the intermediate lever; 4 — draft of the pneumoproofreader; 7 — draft; 8 — the sector lever; 9 — the air gate; 10 — a carburetor cover; 11 — a sealing element; 12 — the adjusting coupling; 13 — the case of the float-operated camera; 14 — the lever of the drive of the air gate; 15 — the persistent screw of a butterfly valve of primary section of the carburetor; 17 — a butterfly valve of primary section of the carburetor; 18 — the case of mixing cameras; 19 — the screw with a roller; 20 — an emphasis; 21 — a pin; 22 — the profile lever; 23 — the pneumoproofreader's spring; 24 — the pneumoproofreader's cover; 25 — a diaphragm; 26 — the pneumoproofreader's jet

The system of launch of the cold engine (fig. 4.30) — semi-automatic type, consists of the pneumoproofreader, system of levers and the air gate which closing before launch of the cold engine is made by the driver by means of the manual drive. At the time of launch of the engine the pneumoproofreader, using the depression arising under the carburetor automatically slightly opens the air gate on the required corner, ensuring steady functioning of the engine at warming up.

At a pulling of the handle of draft of the air gate it is necessary to press an accelerator pedal.

The system of shutdown of supply of fuel (the economizer of compulsory idling) enters work on the mode of compulsory idling when braking the car as the engine, when there is no need for supply of fuel in the engine. Thereby economy of fuel is provided and emission of toxic substances in the atmosphere decreases.

The system of shutdown of supply of fuel of the K-151 carburetor consists of the control unit 33 (see fig. 4.29), the microswitch 35 of the electromagnetic valve 32 and the economizer of compulsory idling. The microswitch and the economizer of compulsory idling are placed on the carburetor, the electromagnetic valve — the control unit — on a cabin front guard.

The control unit 33 represents the device which depending on the frequency of the electric impulses arriving from the ignition coil operates the electromagnetic valve 32. At the released accelerator pedal contacts of the microswitch 35 have to be opened.

The system of shutdown of supply of fuel works as follows. At the released pedal of an accelerator and the frequency of rotation of a bent shaft of the engine more than 1400 ^min.-1 the control unit does not give tension on the electromagnetic valve therefore via channels of the electromagnetic valve atmospheric air comes to the economizer of compulsory idling which valve blocks the channel of idling.

In case of violation of normal work of system of shutdown of supply of fuel (the engine is not launched or "becomes deaf" at the released pedal of butterfly valves) it is necessary to be convinced of reliability of electric contacts of elements of system then it is necessary to check consistently operability of the electromagnetic valve, microswitch and control unit first of all.

For check of the electromagnetic valve and the microswitch it is necessary to separate the electric socket of the control unit, to include ignition (not to launch the engine!) and from a motor compartment one hand smoothly to open and close several times butterfly valves of the carburetor, and another — to hold the electromagnetic valve. At the serviceable electromagnetic valve and a safety lock and at the serviceable and correctly adjusted microswitch operation of the electromagnetic valve (vibration, clicks) has to be felt.

For check of the control unit it is necessary to insert the socket into the block, to include ignition, to launch the engine and to warm up it. Then from a motor compartment one hand to open butterfly valves approximately on 1/3 courses, another — to hold the electromagnetic valve. To sharply release butterfly valves. At the same time, if the control unit is repaired, the electromagnetic valve has to be switched-off, and at decrease in frequency of rotation of a bent shaft approximately up to 1050 ^min.-1 the electromagnetic valve has to turn on.

All systems of the carburetor are connected to the float-operated camera, fuel level in which is supported by a float 2 and the fuel valve 1 (see fig. 4.29).

The basic dosing elements of carburetors are given in tab. 4.5.

Parameters	First camera		Second camera
	K-151	K-151D	K-151	K-151
The jet is fuel main, cm3/min.	220±3,0	220+3,0	380±5,0	380±5,0
The jet is air main, cm3/min.	330±4,5	330±4,5	330±4,5	330±4,5
Block of jets of idling, cm3/min.:
idling tube	95±1,5	95±1,5	-	-
the tube is emulsion	85±1,5	85±1,5	-	-
Jet air idling	330±4,5	330±4,5	-	-
Jet emulsion idling	280±3,5	280±3,5	-	-
Jet fuel transitional system, cm3/min.	-	-	150+2,0	150+2,0
Jet air transitional system, cm3/min.	-	-	270±3,5	270±3,5
Diameter of an opening of a spray of the accelerating pump, mm	0,4+0,03	0,4+0,03	-	0,4+0,03
Diameter of an opening in the screw of an ekonostat, mm	1,1+0,06	1,1+0,06	-	2+0,06
Diameter of an opening of restart-up of fuel in a tank, mm	1,1+0,06	1,1+0,06	-	-
Diameter of a saddle of the fuel valve, mm	2,2+0,06	2,2+0,06	-	-
Diameters of diffusers, mm:
small	10,5+0,1	10,5+0,1	10,5+0,11	10,5+0,11
big	23+0,045	23+0,045	26+0,045	26+0,045

The mass of a float assembled — no more than 12,5 g.