3.6. Power supply system


Fig. 2.14. Scheme of a power supply system of cars of family UAZ-31512: 1 – carburetor;
2 – filter of thin purification of fuel; 3 – an electrogasoline pump (is established together with a starting heater); 4 – fuel pump; 5 – fuel tank (right); 6 – crane of switching of the fuel tanks; 7 – filter settler; 8 – stopper of a drain opening of the filter; 9 – fuel tank (left)


Fig. 2.15. Scheme of a power supply system of cars of family UAZ-3741: 1 – stopper of a bulk opening; 2 – tank the main fuel;
3 – tank additional fuel; 4 – the sensor of the index of level of fuel (on the right tank with a capacity of 30 l is not established); 5 – filter settler;
6 – crane of switching of the fuel tanks; 7 – filter of thin purification of fuel; 8 – fuel pump; 9 – carburetor


Fig. 2.16. The scheme of a power supply system of the car UAZ with one fuel tank: 1 – fuel tank; 2 – stopper of a bulk opening; 3 – sensor of the index of level of fuel; 4 – filter settler; 5 – pump fuel; 6 – filter of thin purification of fuel; 7 – carburetor


Schemes of a power supply system of engines are shown in fig. 2.14, 2.15, 2.16. Reliability and durability of operation of the engine, and also dynamic indicators and profitability of the car in general substantially depends on a condition of a power supply system.
 Service of the fuel tanks consists in periodic discharge from them of a sediment and water, washing of removable filters of reception tubes of a fuel-supply line and tanks. Periodically check reliability of fastening of tanks and if necessary tighten bolts of their fastening.
For washing remove the fuel tanks from the car. Before removal of a tank from the car execute the following:
– switch-off the rechargeable battery;
– open the hatch in a body floor over the sensor of the index of level of fuel and a reception tube of a fuel-supply line;
– disconnect a wire from the sensor of the index of level of fuel and isolate it;
– disconnect a fuel-supply line tube from a flange of a reception tube.
Then turn off bolts of coupling collars and unbend collars down that they did not interfere with lowering of a tank. Remove a tank, wash out it and the filter of a reception tube pure gasoline or hot water and blow compressed air.

Note
Washing of the filter of a reception tube can be made, without removing a tank from the car, at the same time take a tube with the filter via the hatch in a body floor.

Service of a stopper of the fuel tank
You keep a stopper of the fuel tank clean and you watch that did not hammer with dirt an air vent in the center of a stopper; in case of need clean it.
Timely operation of valves of a stopper is important for normal work of a power supply system in high-temperature conditions. Therefore before approach of hot season check their work.

Fig. 2.17. Scheme of check of operation of valves of a stopper of the fuel tank: And – a supply of compressed air; 1 – fuel tank; 2 – mikromanometr;
3 – crane


For definition of the moment of operation of the final valve connect according to the scheme provided on fig. 2.17 the fuel tank to the compressor, open the crane 3 and turn on the compressor. Then smoothly closing the crane, increase pressure in a tank and you monitor indications of the micromanometer 2.
At the time of operation of the final valve pressure has to fall in a tank.
For check of operation of the inlet valve connect the fuel tank according to the same scheme to the vacuum pump. The further procedure for test is similar described above. If the final valve opens with a pressure less than 0,78 kPa (0,008 kgfs/cm2) and more than 4,9 kPa (0,05 kgfs/cm2) or inlet opens at depression more than 2,7 kPa (0,03 kgfs/cm2), then replace a stopper.

Service of the fuel filter settler

Fig. 2.18. Fuel filter settler:
1 – settler cover; 2 – unions of fuel-supply lines; 3, 7, 12 – laying; 4 – bolt; 5 – arm; 6 – settler case; 8 – stopper of a drain opening; 9, 13 – washers; 10 – spring;
11 – the filtering element


Periodically merge a sediment of dirt and water through a drain opening (fig. 2.18). Before a winter season of operation remove and wash out the filtering element in gasoline or acetone, without sorting it. After washing blow the filtering element air under pressure of no more than 97,5 kPa (1 kgf/cm2) not to damage the filtering plates.

Service of the fuel pump

Fig. 2.19. Fuel pump B9V (451M-1106010-30, 451M-1106010-30):
and – a control opening; 1 – case; 2 – rod; 3 – sealant; 4 – washer; 5,14 – springs;
6 – diaphragm; 7 – inlet valve; 8 – filter grid; 9 – laying; 10 – cover; 11 – screw;
12 – final valve; 13 – case head;
15 – drive lever;
16 – clown of a rasp-redval; 17 – drive lever axis; 18 – roller of the lever of manual pumping; 19 – lever of manual pumping


Periodically delete dirt from a head of 13 (fig. 2.19) of the case of the fuel pump and wash out the mesh filter 8. At installation of a cover 10 into place you watch safety of laying 9.
Dribble of fuel through a control opening testifies to malfunction of a diaphragm 6. In this case remove the pump, sort and replace a diaphragm.
At assembly of the pump tighten screws of fastening of a head at the diaphragm delayed in extreme lower situation.
Periodically check fastening of the pump to the engine and tightness of connections of fuel-supply lines.
Before approach of hot season check pressure developed by the pump.
You make check without removal of the pump from the car during the operation of the engine at a small frequency of rotation of a bent shaft idling. For the period of check disconnect the tube bringing fuel in the carburetor from it and connect to the manometer with a scale up to 100 kPa (1 kgf/cm2). Start-up and power supply of the engine are carried out at the expense of the fuel which is available in the float-operated camera of the carburetor. The pump has to create pressure not less than 11,7 kPa (0,12 kgfs/cm2). After an engine stop pressure shown by the manometer should not fall during 10 pages.
If the pump does not meet the specified requirements, repair it or replace.

Fig. 2.20. Fuel pump 2105-1106010-50: 1 – rod; 2 – laying is remote internal; 3 – the washer is sealing; 4 – diaphragm; 5 – clown; 6 – laying of a cover; 7 – the spring is central; 8 – the element filtering; 9 – branch pipe; 10 – lever of manual pumping; 11 – lever spring; 12 – returnable spring; 13 – the case top with valves; 14 – a pump cover with branch pipes; 15 – valve; 16 – valve spring; 17 – valve saddle stopper; 18 – valve plate


In fig. 2.20 the fuel pump 2105-1106010-50 installed on parts of cars is shown. Service its similarly described above.

Service of the filter of thin purification of fuel

Fig. 2.21. Filter of thin purification of fuel:
1 – case; 2 – laying; 3 – the filtering element; 4 – glass; 5 – a spring of the filtering element; 6 – yoke; 7 – nut lamb


Periodically sort it for washing of a settler and the filtering element. For dismantling release a nut lamb of 7 (fig. 2.21) and shift a bracket 6 aside then remove a settler together with the filtering element 3.

Service of the K-131 carburetor (for engines of fashion. 414)

Fig. 2.22. Scheme of the K-131 carburetor: 1 – pneumatic actuator of start-up and warming up; 2 – drive of the accelerating pump and economizer; 3 – spray of the accelerating pump; 4 – air gate;
5 – economizer spray; 6 – semiautomatic device of start-up and warming up; 7 – the main air jet with an emulsion tube; 8 – air jet of idling; 9 – economizer jet; 10 – fuel jet of idling; 11 – main fuel jet; 12 – mikrovyklyuchatel; 13 – block of management; 14 – electromagnetic valve; 15 – screw of operational adjustment; 16 – adjusting screw of composition of mix; 17 – idling economizer valve; 18 – throttle gate; 19 – economizer valve; 20 – return valve; 21 – delivery valve; 22 – disbalance valve; "and" and – unions for connection of hoses of the electromagnetic valve


The K-131 carburetor (fig. 2.22) – vertical, balanced, with the falling stream, single-chamber, two-diffuser. The main dosing system – with pneumatic braking of fuel and emulsifying in a well, with the central supply of the emulsifying air. Besides, the carburetor has autonomous system of idling and semi-automatic system of start-up and warming up.
Service of the carburetor consists in periodic check of reliability of fastening of the carburetor and its separate elements, check and adjustment of level of fuel in the float-operated camera, adjustment of small frequency of rotation of a bent shaft of the engine in the idling mode, check of operation of the accelerating pump and economizer, cleaning, a purge and washing of details of the carburetor from resinous deposits, check of capacity of jets.

Fig. 2.23. Viewing window of the float-operated camera of the carburetor: and – fuel level tags


Fig. 2.24. Float of the carburetor and its adjustment: 1 – float; 2 – float course limiter; 3 – uvula of adjustment of level; 4 – float axis; 5 – valve needle; 6 – valve case; 7 – valve washer


You make check of level of fuel at the idle engine of the car installed on the horizontal platform. When pumping fuel by means of the manual drive of the pump fuel level in the float-operated camera of the carburetor has to be established in the limits noted by tags (inflows) "and" (fig. 2.23) on walls of an observation port. At a level deviation from the specified limits make adjustment for what uncover the float-operated camera. You make adjustment of level a podgibaniye of a uvula of 3 (fig. 2.24). At the same time podgibaniy the limiter 2 establish the course of a needle of the 5th valve of supply of fuel of 1,2-1,5 mm. After adjustment check the level of fuel again and if necessary make adjustment repeatedly. Considering that in use owing to wear of the float-operated mechanism fuel level gradually increases, establish it at adjustment on the lower limit. In this case fuel level longer time will be in admissible limits.

Note
At adjustment of level of fuel in the float-operated camera of the carburetor do not turn in a float uvula pressing a float, and turn in by means of the screw-driver or flat-nose pliers.

You make adjustment of small frequency of rotation of a bent shaft in the mode of idling on the heated-up engine at serviceable system of ignition.
You make adjustment in the following order:

Fig. 2.25. Adjusting screws of a karbyura-tor: 1 – screw adjusting composition of mix of idling; 2 – screw of an operational re-gulirovka of idling; 3 – union of ventilation of a case of the engine; 4 – seal


1. Previously establish by the screw 2 (fig. 2.25) the frequency of rotation of a bent shaft idling 550–600 min.-1.
2. Install the screw 1 in the situation providing the largest frequency of rotation of a bent shaft of the engine at this provision of a butterfly valve. The screw 1, besides, regulate contents WITH in the fulfilled gases.
3. Finalize the screw 2 the small frequency of rotation idling (550–650 min.-1).

Fig. 2.26. Valve of disbalance of a karbyu-rator: 1 – disbalance valve; 2 – adjusting screw of the valve; 3 – union of removal of vapors of fuel


4. Adjust the drive of the valve 1 (fig. 2.26) of disbalance of the float-operated camera the screw 3. At completely released butterfly valve the valve has to be open.

Fig. 2.27. Shift of a restrictive washer on a rod of the accelerating pump:
1 – protochka top; 2 – restrictive washer; 3 – protochka lower


Check operation of the accelerating pump in case by sharp pressing a pedal of a butterfly valve in operation of the engine failures are observed, and the engine slowly increases rotation frequency. For check sharply open a butterfly valve, at the same time from a spray of the accelerating pump fuel has to flow. At the special stand it is possible to check giving of the accelerating pump which has to be not less than 8 cm3 for 10 working courses of the piston. In use the carburetor owing to wear of the piston and walls of a well of the accelerating pump its giving can be insufficient. To increase giving, rearrange a restrictive washer of 2 (fig. 2.27) on a rod of the accelerating pump in the lower pro-point 3. At operation of the car in high-temperature conditions reduce giving of the accelerating pump, having rearranged a restrictive washer in the top pro-point of 1 rod.

Fig. 2.28. Check of full turning on of the economizer


If the engine does not develop the maximum power at completely open butterfly valve, check full turning on of the economizer. For this purpose check a gap between a level and a nut of a rod of the drive of the economizer at completely open butterfly valve which has to be (3±0,2) mm (fig. 2.28). If necessary adjust this gap by means of a nut then fix a nut by sinking it on small diameter.
Capacity of jets is defined at the special stand by spilling of water by them under pressure (pressure) of a water column 1000±2 mm high and temperature (20±1) of °C. Capacity of jets, ml/min.:
main fuel jet..... 350±4,5
fuel jet of idling..... 55±1,5
main air jet..... 175±4
air jet of idling..... 290±7
At a vyvertyvaniye and a zavertyvaniye of jets be careful of damage of a carving to openings. Keep in mind that the main fuel jet and a fuel jet of idling are externally similar among themselves, but have a different carving.
You make washing of details of the carburetor benzene or unleaded gasoline, then blow them compressed air.
Do not use a metal wire for a clearing of jets and the calibrated openings as it will lead to violation of their sizes and capacity.
In case of failure in a way of the electronic block 13 (see fig. 2.22) or the microswitch 12 connect one of hoses carburetor "and" and "b" unions among themselves, passing the electromagnetic valve.

Service of K-151B carburetors (for engines of fashion. 4178), K-151E (for engines of fashion. 4218) and K-151U (for engines of fashion. 4021.60)

Fig. 2.29. K-151B carburetor: 1 – air gate; 2 – screw; 3 – starting spring; 4 – carburetor cover; 5 – a bracket (only for K-151H); 6 – laying; 7 – the pneumoproofreader's diaphragm with draft assembled; 8 – laying; 9 – pneumoproofreader's cover; 10 – spring; 11 – screw; 12 – screw displacer; 13 – ball (inlet valve); 14 – float; 15 – case of the float-operated camera; 16 – fuel supply union; 17 – washer; 18 – filter fuel; 19 – washer; 20 – bolt of toplivoprovodyashchiya; 21 – stopper; 22 – cover of the accelerating pump; 23 – lever of the drive of the accelerating pump; 24 – union of ventilation of crankcase gases; 25 – butterfly valve of the secondary camera; 26 – case of mixing cameras; 27 – screw; 28 – cam; 29 – screw; 30 – butterfly valve of primary camera; 31 – economizer valve assembled; 32 – screw adjusting composition of mix; 33 – locking element of the EPHH valve; 34 – EPHH valve case; 35 – laying; 36 – EPHH valve cover; 37 – tube; 38 – screw of operational adjustment of turns of idling; 39 – laying heat-insulating (textolite); 40 – laying heat-insulating (cardboard); 41 – the diffuser is small; 42 – spray of the accelerating pump;
43 – screw adjusting fuel restart-up; 44 – spring; 45 – diaphragm of the accelerating pump assembled; 46 – laying; 47 – screw; 48 – stopper;
49 – washer; 50 – jet emulsion idling; 51 – electromagnet; 52 – draft; 53 – clamp; 54 – nut; 55 – lever; 56 – union; 57 – screw;
58 – ventilation valve cover; 59 – ventilation valve; 60 – spring; 61 – laying


The K-151B carburetor (fig. 2.29) – vertical, emulsion, two-chamber, with the falling stream of mix and consecutive opening of butterfly valves. The carburetor has the balanced float-operated camera, two main dosing systems – the first and second cameras, autonomous system of idling in primary camera with quantitative adjustment of mix of constant structure with the economizer of compulsory idling (ECI), transitional systems of primary and secondary cameras, эконостат with a conclusion in the secondary camera, the diaphragm accelerating pump with the mechanical drive from the roller of a butterfly valve of primary camera and with a spray conclusion in primary camera, semi-automatic system of start-up and warming up of the hand-operated engine. Besides, the carburetor is equipped with the valve of ventilation of the float-operated camera.
Service of the carburetor consists in periodic check of reliability of fastening of the carburetor and its separate elements, check and adjustment of level of fuel in the float-operated camera, adjustment of small frequency of rotation of a bent shaft of the engine, cleaning, a purge and washing of details of the carburetor from resinous deposits, check of capacity of jets.
You make check of level of fuel at the idle engine of the car installed on the horizontal platform and uncovered the carburetor. The float-operated camera is filled with fuel by means of the lever of manual pumping of a gasoline pump.

Fig. 2.30. Check of level of fuel


Fig. 2.31. Float and fuel valve:
1 – float; 2 – uvula; 3 – fuel valve;
4 – earring; 5 – uvula; 6 – saddle of the fuel valve; 7 – sealing washer (elastic locking element); 8 – fuel filter; 9 – union of a toplivopodvod; 10 – toplivoprovodyashchy bolt


Level of fuel (fig. 2.30) has to be in limits of 20-23 mm from the plane of the socket of the float-operated camera. For its check it is necessary to screw the union with the M carving 10xl–6g for connection of a rubber hose. The union is screwed in the float-operated camera instead of a drain stopper. Level of fuel is defined by a transparent tube with an internal diameter not less than 9 mm. Adjustment of level is made by a podgibaniye of a uvula of the 5th loop of a float (fig. 2.31) to the size of 10,75-11,25 mm between the top part of a float and the plane of the socket of the float-operated camera (the float has to be lifted in extreme top situation). In extreme lower situation the float should not concern walls of the float-operated camera, and his uvula 2 has to be on an emphasis And. At the same time the valve stroke 3 has to be equal to 1,5+0,5 mm. The valve stroke is regulated by a uvula podgibaniye 2 loops of a float. After adjustment check the level of fuel again and if necessary make adjustment repeatedly.
If adjustment does not yield desirable result, it is necessary to make check of the float-operated mechanism. Usually the reasons of the raised or lowered fuel level in the float-operated camera are asymmetry of a float, its wrong mass, and also jamming or leakage of the fuel valve. Tightness of a float is checked by its immersion in the water heated to 80 - 85 °C with endurance on time not less than 30 pages. The mass of a float assembled with a loop after repair should not be more than 13 g. In case of leakage of the fuel valve it is necessary to replace a sealing washer 7. After replacement of a sealing washer at assembly of the valve 3 with an earring 4 it is necessary to consider that the earring has to be established so that the ledge of an earring B was directed aside, opposite to a float.
Adjustment of the minimum frequency of rotation of the mines-1 crankshaft 550-650 (700–750 min.-1 – for model 4218 engines) in the mode of idling needs to be carried out on the heated-up engine (temperature of cooling liquid of 70 °C) at serviceable system of ignition.
During operation of the car the minimum frequency of rotation of idling is regulated by turn of the screw of operational adjustment. When unscrewing the screw the frequency of rotation increases, at screwing up – decreases.
If rotation of the screw of operational adjustment did not possible to reach steady operation of the engine, it is necessary to turn out the screw of composition of mix against the stop of the restrictive plug (a napressovan on the screw) and again to adjust the minimum frequency the screw of operational adjustment.
Full adjustment of the carburetor is made at car repair shop (with use of the gas-analytical equipment) and has to be made under following conditions:
– on the heated-up engine;
– with the adjusted gaps in the gas-distributing mechanism;
– with serviceable spark plugs and the adjusted ignition advancing corner;
– at completely open air gate. Sequence of adjustment:
1. To adjust the screw of operational adjustment the minimum frequency of rotation of idling.
2. To adjust the screw of composition of mix the content of carbon monoxide (SO) within 1,0–1,5%, previously having removed the restrictive plug. Content of hydrocarbons (SN) at the same time should not exceed 1000 million-1.
3. To be convinced that the picked-up position of screws ensures normal functioning of the engine at throttlings for what to slightly open a throttle and sharply to release. If at the same time stops of the engine or unstable work are noted, then it is necessary or to increase the minimum frequency of rotation, unscrewing the screw of operational adjustment, or to enrich mix with the screw of composition of mix. The most admissible contents FROM at the same time no more than 2%.
4. To increase rotation frequency up to 2400 min.-1. Contents WITH has to be no more than 1%; SN – no more than 500 million-1.
After final adjustment to install on the screw adjusting composition of mix the restrictive plug and to note its situation. To warm up the engine up to the temperature of cooling liquid of 80-85 °C and to check contents WITH in the fulfilled gases on idling turns. Contents WITH should not be more than 4,5% at any position of the screw of toxicity which the restrictive plug allows to establish. To install the screw with the restrictive plug in noted situation.
Adjustment of the minimum frequency of rotation of a bent shaft by means of screws of half-open of butterfly valves is not allowed.
When checking operation of the carburetor pay attention to operation of the valve of ventilation of the float-operated camera (reliability of connection of wires, lack of jamming and tightness of the valve). Malfunction in operation of the valve leads to increase in fuel consumption and difficulty of launch of the hot engine.
You make washing of details of the carburetor benzene or unleaded gasoline, then blow compressed air.
Do not use a metal wire for a clearing of jets and the calibrated openings as it will lead to violation of their sizes and capacity.
Not to mix jets at installation, it is necessary to pay attention to their marking. Each jet has the marking containing value of nominal capacity in ml/min. Marking is put in the shock way on a jet head (from outside a vent).

Service of the K-126GU carburetor (for engines of fashion. 4178)
The K-126GU carburetor is used to a complete set of engines of model 4178 as option instead of the K-151B carburetor.

Nominal size of capacity of jets of K-151V, K-151E, K-151U carburetors, (ml/min.)

1st camera
2nd camera
The jet is fuel main
225
330 (330/380)
The jet is air main
330
230(230/330)
Block of jets of idling:

idling tube
95(110/95)
-
the tube is emulsion
85
-
Jet air idling
330 (175/330)
-
Jet emulsion idling
280 (175/210)
-
Jet fuel transitional system
-
150 (200/150)
Jet air transitional system
-
270

Note
Some jets of K-151V, K-151E and K-151U carburetors have various capacity. In brackets it is specified: in numerator — for K-151E, in a denominator — for K-151U.

Essentially the K-126GU carburetor is similar to the K-151B carburetor, but has simpler design (there are no autonomous system of idling, the EPHH system and the valve of ventilation of the float-operated camera).
Service of the carburetor is similar to service of the K-131 carburetor. Adjustment of the minimum frequency of rotation of a bent shaft of idling is made in the following sequence:
– to turn to the full, but not hardly, the screw changing composition of mix and then to turn off it on 1,5 turns;
– to launch the engine and to establish by the persistent screw of a butterfly valve the steady frequency of rotation of bent shaft 550-650 mines-1. The screw of the limiter of toxicity regulates extreme value of carbon monoxide.

Service of the air filter

Fig. 2.32. Air filter: 1 – coupling; 2, 10 – collars; 3 – case of the air filter; 4 – flame arrester;
5 – the filtering element;
6 – a cover with a framework of the filtering element; 7 – sealant; 8 – bolt coupling;
9 – bracket of fastening of a cover; 11 – airintaking sleeve



Air filter (rice. 2.32) – dry type with the replaceable filtering element from synthetic nonwoven material, it is established on the engine from the right party ahead of the carburetor and connected to the last with the help of the rubber coupling, zak-replyayushcheysya on the carburetor a wire collar.
Service of the air filter consists in visual survey and cleaning of pollution of the filtering element, its replacement at existence of breaks and prozhogov.
The filtering element is allowed to clear no more than 15 times the next ways: to wash out water with addition of the synthetic washing means with the subsequent rinsing easy otzhatiy and drying; to blow or clear stryakhivaniyem.
You make obligatory replacement of the filtering element: in the presence of breaks or prozhog; through 100 000 km of a run; at achievement of the most admissible number of times of cleaning.
It is necessary for replacement or cleaning of the filtering element: to weaken bolts 8 and a collar 2; to remove brackets 9; to uncover 6 with the filtering element 5; to remove a collar 10 and to pull together the filtering element from a framework.
You make assembly of the filter in the return sequence.
Do not allow operation of the filter with the removed flame arrester 4, with damaged by a sealant 7 and the coupling 1.

Service of the inlet pipeline

Fig. 2.33. Scheme of heating of an inlet pipe: I – heating is switched off – "summer"; II – heating is included – "winter"



Periodically clear its internal surfaces as deposits reduce sections of inlet channels through passage of resinous deposits and lead to falling of engine capacity. At seasonal service install the gate (fig. 2.33) in the situation corresponding to the coming season.

Service of the drive of management of a butterfly valve of the carburetor
In use adjustment of full opening of a butterfly valve of the carburetor and the provision of a pedal can be required.

Fig. 2.34. Management of carat-byuratorom of cars of family UAZ-31512: 1 – pedal of control of the throttle gate; 2, 16 – lock-nuts;
3 – adjusting coupling;
4 – ottyazhny spring;
5 – arm; 6 – roller; 7 – compensation spring; 8 – ry-chag; 9,10 – nuts; 11 – draft; 12 – intermediate lever; 13 – lever of a cable of the drive of the throttle gate; 14 – arm of fastening of a cover of a cable; 15 – draft is adjustable; 17 – tip; 18 – lever of the throttle gate; 19 – handle of the drive of the air gate; 20 – handle of the drive of the throttle gate



If on cars of family UAZ-31512 when pressing a pedal against the stop in a floor the butterfly valve opens not completely, then release a lock-nut of 2 (fig. 2.34) and, rotating the coupling 3, truncate draft of a pedal. Shorten it so to provide full opening of a butterfly valve of the carburetor, but the compensation spring 7 at the same time should not be compressed completely.

Nominal size of capacity of jets of the K-126GU carburetor, (ml/min.)
 
1st camera
2nd camera
The jet is fuel main
240+-3,0
350+-4,5
The jet is air main
280+-3,5
280+-3,5
Block of jets of idling:

   fuel
50+-1,0
95+1,5
   air
285+-4,0
285+-4,0

The pedal has to be in the released situation at distance of 80 - 95 mm from an inclined floor. After adjustment tighten a lock-nut 2. If carving length on draft of a pedal of an accelerator is not enough for adjustment performance, then change length of draft 15, screwing in or unscrewing it from a tip 17 for what release a lock-nut 16 and tighten it after adjustment.
Periodically grease rubber plugs of the roller 6 of a butterfly valve with brake fluid, and flexible drafts of manual control by air and throttle gates – Litol-24 lubricant.
Throttle the gate of the carburetor of cars of family UAZ-3741 you make service of the drive of management in the following order:

Fig. 2.35. Control of the carburetor of cars of family UAZ-3741: 1 – accelerator pedal; 2 – pedal roller; 3 – nut;
4 – roller lever; 5 – the nut is lock; 6 – draft of the roller of an accelerator;
7 – lever of the throttle gate; 8 – draft lever; 9 – handle of management of a butterfly valve; 10 – handle of control of the air gate


1. Disconnect the end of a spring from the lever 4 (fig. 2.35) of the roller.
2. Release a lock nut 5.
3. Take away the lever 4 rollers back to the provision of full closing of a butterfly valve (as far as the idling screw will allow) and, holding it in this situation, establish a pedal 1 together with the roller 2 in such situation that the distance from a floor till the top end of a pedal was 120±5 mm.
4. Tighten in this situation a lock nut 5 and hook for the lever on 4 rollers a spring.
If the drive is adjusted correctly, then at the released pedal and completely moved handle of manual control the butterfly valve has to be closed, and when pressing a pedal to the full – is completely open.

Service of manual drives of throttle and air gates
Adjust the manual drive of a butterfly valve, changing the place of fastening of draft. When fastening its end in the hinged coupling of the lever 13 (see fig. 2.34) achieve that the butterfly valve at the handle 20 moved to the full was completely closed, and at the handle extended on itself – it is open not less than on 3/4 turns.
Adjust the drive of the air gate also changing places of fastening of draft which end you fix in the hinged coupling of the lever of the air gate. At the drive handle which is completely extended on itself the air gate has to be closed densely. At completely open air gate the handle of the drive can not reach against the stop in the panel on 2 mm.
At hard movement of drafts in covers grease them with Litol-24 lubricant.
For lubricant extend draft from a cover, having released previously the screw of fastening of thirst for the lever.
Adjustment of manual drives of throttle and air gates of cars of family UAZ-3741 is similar described above.