2.1.1. Maintenance

Krivoshipno-shatunny mechanism

Fig. 19. Order of an inhaling of nuts of a head of the block of cylinders


Tighten nuts of fastening of a head of the block of cylinders after a running in of the car and through 1000 km of a run after each removal of a head. You carry out an inhaling of nuts only on the cold engine in the sequence specified fig. 19 to two receptions. Final moment of an inhaling of 90-94 N · m (9,0 - 9,4 kgfs · м).
On a measure of need clear of a deposit a head of the block of cylinders, the bottoms of pistons and inlet valves.
On the serviceable not worn-out engine during the using of high-quality fuel and oil and observance of the appropriate thermal mode the deposit is insignificant.
At wear of the engine, especially its piston rings, a lot of oil gets to cameras of combustion and the big layer of a deposit is formed. Existence of a deposit is determined by strengthening of a detonation, an overheat, power deceleration and increase in a consumption of fuel. At emergence of these signs remove a head of the block of cylinders and remove a deposit with the help of metal scrapers and brushes. Do not allow hit of a deposit in a gap between heads of pistons and cylinders. If the engine used ethylated gasoline, then previously moisten a deposit with kerosene that in time of cleaning to exclude a possibility of inhalation of poisonous dust.

Gas-distributing mechanism

Fig. 20. Drive of valves: 1 – camshaft; 2 – pusher; 3 – bar;
4 – valve saddle; 5 – valve; 6 – the directing valve plug; 7 – lock ring; 8 – washer; 9,12 – springs; 10 – the cap is maslootrazhatelny; 11 – cap spring; 13 – plate of springs; 14 – crackers; 15 – yoke; 16 – adjusting screw; 17 – lock-nut; 18 – axis of yokes;
19 – rack; 20 – head of the block of cylinders


The drive of valves is carried out from a distributive shaft through pushers, a bar of pushers and a yoke (fig. 20).
The distributive shaft pig-iron, consists of five basic necks, cams of the drive of valves, a gear wheel at - water of the oil pump and the clown of the drive of the fuel pump.
The distributive shaft is given to rotation from a bent shaft by couple of gear wheels with slanting teeths. A gear wheel on cranked to a shaft pig-iron, and on distributive – a plastic wreath with a pig-iron nave. Both gear wheels have two carving openings for installation of a stripper.

Fig. 21. Adjusting tags on distributive gear wheels: and – tags


Correctness of phases of distribution is provided with installation of gear wheels on tags (fig. 21). About on a gear wheel of a bent shaft the tooth hollow has to have a tag against risks on a camshaft gear wheel.

Fig. 22. Persistent flange of the camshaft: 1 – gear wheel; 2 – persistent flange;
3 – expansion ring; 4 – camshaft


Axial movement of a distributive shaft is limited to the steel persistent flange of 2 (fig. 22) which is between an end face of a neck of a distributive shaft and a nave of a gear wheel. The working gap of 0,1-0,22 mm between a nave of a gear wheel and a persistent flange is provided that the expansion ring 3 clamped between a gear wheel and a neck of a distributive shaft is thicker than a persistent flange.
In the gas-distributing mechanism it is necessary to regulate periodically gaps between yokes and valves. This operation should be carried out on the cold engine after 10 000 km of a run or at emergence of signs of violation of gaps (knock of valves, reduction of engine capacity, flash in the carburetor, "shots" in the muffler) in the following order:
– remove a tube of the vacuum regulator;
– carefully remove a cover koro-myset, avoiding damage of its laying;

Fig. 23. Adjusting tags on a pulley damper of a bent shaft: 1 – a pin on a cover of distributive gear wheels; 2 – a tag for the VMT installation; 3 – a tag for installation of the moment of ignition


Fig. 24. Adjustment of a gap between a yoke and the valve: 1 – plate of a spring; 2 – valve; 3 – yoke; 4 – adjusting screw;
5 – lock-nut


– install the piston of the first cylinder on a tag of 2 (fig. 23) on a pulley of a bent shaft in the top dead point at a step of compression and the probe check a gap between yokes and valves of the first cylinder. At the wrong gap turn off a lock-nut of 5 (fig. 24) of the adjusting screw 4 and, turning the screw-driver the adjusting screw, establish a gap on the probe then, holding the screw-driver the adjusting screw, tighten a counter-nut and check still time correctness of the established gaps;
– after adjustment of gaps of the next cylinder turn a bent shaft on a half-turn and adjust gaps for other cylinders according to an order of their work: 1–2–4–3.

Lubrication system

Fig. 25. Scheme of the lubrication system of the engine: 1 – oil pump; 2 – stopper of a drain opening of a case; 3 – oil receiver; 4 – reducing valve; 5 – an opening for lubricant of distributive gear wheels; 6 – sensor of a control lamp of emergency pressure of oil; 7 – sensor of the index of pressure of oil;
8 – crane of the oil heater; 9 – oil heater; 10 – full-line filter of purification of oil


The scheme of the lubrication system is shown in fig. 25.
Oil pressure in the lubrication system of the heated-up engine at a small frequency of rotation of a bent shaft idling at the open crane of an oil radiator has to be 700–750 min.-1 not less than 39 kPa (0,4 kgfs/cm2); on not the heated-up engine pressure can reach 441–490 kPa (4,5–5,0 kgfs/cm2); at a speed of car of 45 km/h pressure has to be 196–392 kPa (2,0 - 4,0 kgfs/cm2), and in a hot flying weather not less than 147 kPa (1,5 kgfs/cm2).
Pressure of less specified sizes testifies to malfunction in the engine. Operation of the engine thus has to be stopped before malfunction elimination.
For cooling of oil in system the oil radiator which is included is established, opening the crane, at a temperature of air above 20 °C. At lower temperatures the radiator has to be disconnected. However irrespective of air temperature at the movement under trying conditions (with big loading and high frequency of rotation of a bent shaft of the engine) it is also necessary to open the crane of an oil radiator.

Fig. 26. Engine (left-side view): 1 – cover of an oil-filling mouth; 2 – index of level of oil; 3 – stopper of a drain opening of a case


Support oil level in a case of the engine near a tag P masloizmeritelnogo a core of 2 (fig. 26). Measure oil level through 2–
3 min. after a stop of the heated-up engine. Do not pour oil above a tag P as it will lead to increase in spraying of oil and, as a result, to coking up of rings, nagaroobrazovaniyu in the camera of combustion and on the bottoms of pistons, an oil leak through epiploons and laying. If oil level below a tag Oh, there can be an operation engine bearings.
Change oil in an engine case as directed of tab. 1 or at difference of pressure of oil of 58-73 kPa (0,6–0,7 kgfs/cm2) to the filter and after it. For replacement of the filter unscrew it against an hour arrow.
At installation of the oil filter rubber sealing laying has to be in a special groove of the case of the filter.
At operation of the car you monitor operation of sensors of pressure of oil. The sensor of emergency pressure of oil works at pressure drop in system to 39–78 kPa (0,4–0,8 kgfs/cm2).
At inclusion of ignition the lamp of emergency pressure of oil lights up, and after launch of the engine – dies away. Burning of a lamp on the working modes indicates malfunction of the sensor or lubrication system of the engine.
At the raised oil consumption (and lack of a leak) check serviceability of system of ventilation of a case (fig. 27) and a condition of maslootrazhatelny caps, valves and tsilindroporshnevoy groups.

Service of system of ventilation of a case of the engine

Fig. 27. Scheme of ventilation of a case of the engine: 1 – depression regulator; 2,3 – hoses


Fig. 28. Depression regulator: 1 – spring;
2 – case; 3 – membrane; 4 – cover; and – a valve saddle; – the calibrated opening


Through each 20 000 km of a run clear and wash out kerosene hoses 2,3 systems of ventilation (see fig. 27), the calibrated opening and details of the regulator of depression (fig. 28).
For washing and cleaning remove the depression regulator from the engine and sort.
At assembly of the regulator of depression it is necessary to provide tightness of connection of the case and a cover.

Cooling system
At service of the cooling system check the level of cooling liquid, delete a scum and rainfall from system, regulate a fan belt tension, wash out a radiator outside.
As cooling liquid Lena liquids Tosol-A40M or OZh-40 are applied low-zamerzayushchiye.
At a temperature of surrounding air below -40 °C apply the low-freezing Lena liquid Tosol-A65M or OZh-65.
In case of fire of a control lamp of an overheat of cooling liquid immediately establish and eliminate the malfunction reason.
Periodically check the level of cooling liquid in a broad tank. It has to be 3-4 cm higher than min tag. Cooling liquid has high coefficient of thermal expansion, and its level in a broad tank considerably changes depending on temperature,
therefore you carry out an inspection of level at a temperature in system +15–20 °C.
When decrease in level of cooling liquid in a broad tank happened for a short interval of time or after the small run (to 500 km), check tightness of the cooling system and, having eliminated leakage, add in a radiator or in a broad tank the same cooling liquid.
Every three years or each 60 000 km (depending on what will come earlier) wash out the cooling system, and replace cooling liquid new.
Wash out the cooling system the next way:
– fill system with clear water, launch the engine, warm up it, at the engine working idling merge water and stop the engine;
– after cooling of the engine repeat the specified operation.
At considerable adjournment of a scum and rainfall delete them from system
coolings with washing with a pure strong stream. The engine about-myvayte separately from a radiator that a rust, the scum and rainfall from a shirt of cooling of the engine did not litter a radiator. In this case before washing of the engine take out the thermostat from a branch pipe and disconnect hoses from a radiator.
For the best cleaning of a shirt of cooling of the block of cylinders turn out from the block of cylinders the drain crane together with the union.

Fig. 29. Washing of the cooling system


The direction of a stream when washing has to be the return to the direction of the movement of cooling liquid (fig. 29).
Wash out a cooling shirt till that time until the water which is going out of the engine is pure.
Do not use for washing of a ru-head of cooling with alkaline solutions as they cause corrosion of a head and the block of cylinders.
Wash out a radiator at the closed stopper, bringing water at first to the top branch pipe to remove in the first turn a deposit from the lower tank, and then to the lower branch pipe. Wash out till that time until the water which is coming out the top tank is pure.
At the same time wash out a stream of water and blow compressed air a radiator core.
At considerable deposits of a scum in tubes of a radiator execute the following:
1. Remove a radiator from the car and fill in in it 10% solution of caustic sodium (caustic soda) which is previously heated to temperature of 90 °C.
2. In 30 min. merge solution from a radiator.
3. Wash out a radiator hot water in the direction, the return circulation of cooling liquid in the engine (see fig. 29), within 30–40 minutes under pressure of no more than 49 kPa (0,5 kgfs/cm2).

Fig. 30. Check of a tension of a belt of the fan


Regulate a tension of a belt of the fan turn of the generator. The normal deflection of a belt has to be 8–14 mm when pressing it with effort about 4 kgfs (fig. 30).
Check operation of the thermostat at the same time with washing of the cooling system if he acted, and also in case of a systematic overheat of the engine (during the correct work of power supply systems and ignitions).
For check place the thermostat in a vessel with the water heated to temperature of 90-100 °C. Control temperature on the thermometer. Then at gradual cooling of water you watch temperature of the beginning (80±2) °C and the end (70±2) °C of closing of the valve of the thermostat. Replace the faulty thermostat new.
When checking the thermostat turn attention to purity of a plate of the valve. Remove a scum and dirt from the surface of the thermostat with a wooden shovel, then wash out it in water.
It is possible to check serviceability of the thermostat and on heating of a reception branch pipe of the top tank of a radiator at warming up of the engine. At the faulty thermostat the branch pipe gets warm after launch of the engine, at serviceable at once – after water temperature in the block reaches 60–70 °C (an arrow at the beginning of a green zone according to the index of temperature of cooling liquid in a combination of devices).
Operation of the engine without thermostat is not allowed.

Fig. 31. Fan drive coupling: 1 – cover; 2 – compound; 3 – case; 4 – drive plate;
5 – hairpin of fastening of the fan; 6 – bearing; 7 – shaft; 8 – perepuskny opening; 9 – valve; 10 – bimetallic spring; 11 – PMS-10000 liquid


On a part of engines the viscous coupling of the drive of the fan (fig. 31) allowing to cut fuel consumption, to reduce noise of the fan, and also promoting warming up of the cold engine and maintenance of the optimum thermal mode of the engine is installed.
The external surface of the coupling should be kept clean for ensuring the heat removal which is allocated in the course of operation of the coupling, and normal work of a bimetallic spring of the valve. Inclusion and switching off of the coupling happens automatically.
If in use the coupling ceases to work, disconnect it from a nave (connection of the coupling with a nave has the left carving), remove the fan, turn out two hairpins of fastening of the fan from the coupling case, merge working liquid through openings of hairpins and carefully wash out an internal cavity of the coupling gasoline. Let's gasoline flow down completely, then fill in in the coupling through one of openings 40 g of polimetilsiloksanovy TU 6-02-737-78 PMS-10000 liquid. The second opening has to be open for an air outlet. After that wrap hairpins in the case, fix the fan and install the coupling on a cooling system pump pulley nave.
Merge liquid from the cooling system of the engine via two cranes, one of which is located on the lower tank of a radiator, another – on the block of cylinders. At plum remove a radiator stopper.

Power supply system
Reliability and durability of operation of the engine, and also loudspeaker and profitability of the car in general substantially depends on a condition of a power supply system.

Fig. 32. Scheme of a power supply system of UAZ-31601: 1 – fuel tanks; 2 – carburetor; 3 – fuel pump; 4 – filter of thin purification of fuel; 5 – bulk pipes; 6 – stopper of the fuel tank; 7 – filter of rough purification of fuel; 8 – valve of the fuel tank


The scheme of a power supply system is shown in fig. 32.
To the fuel pump fuel arrives from the left tank through the reception tube established on the fuel level sensor. In process of fuel consumption the left tank automatically is replenished from right due to the arising depression as the left tank is not reported with the atmosphere. Thus, originally fuel is spent generally from the right tank. On the cars equipped with engines with injection of gasoline or diesel engines the highway of discharge in the left tank is in addition established it is superfluous the fuel given by the pump from the engine. In this highway the jet pump promoting pumping of fuel from the right tank in left due to energy of the merged fuel is in addition installed.
On the cars equipped with a prestarting heater heater in the right tank there is a fuel reserve (6–8 l) for a heater which is not developed during the operation of the engine.
In urgent cases this rest of fuel can be used for power supply of the engine by a compulsory modulation of fuel in the left tank or changes of the scheme of connection of hoses of fuel-supply lines as it will be provided below.
Traffic jams of mouths of bulk pipes of the fuel tanks provide the tight consolidation excluding a possibility of dribble and evaporation of fuel.
Taking into account features of a design of system of fuel feeding it is recommended:
– to periodically check serviceability of sealing laying of traffic jams of the fuel tanks;
– for ensuring tightness when closing a mouth to wrap a stopper to the full;
– during partial filling of the car originally to fill the left tank;
– owing to a fuel overflowing between tanks periodically to control fuel level in both tanks;
– at violation of an automatic overflowing of fuel from the right tank in left (for example, because of leakage of the left tank) and need of use of the fuel which remained in the right tank for power supply of the engine forcibly it is preferable to pour fuel in the left tank by creation of excessive pressure in the right tank, for example by means of the manual pump for inflating of tires;
– in need of power supply of the engine directly from the right tank (for example, at damage and a leak of the left tank) it is necessary to disconnect a fuel-supply line hose from a reception tube of the fuel level sensor of the left tank and to connect it to a tube on the cross-piece of a body floor connected with a reception tube of the fuel level sensor of the right tank.

Service of the fuel tanks
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 at need tighten bolts of their fastening.
For washing remove the fuel tanks from the car.
Before removal of a tank from the car:
– switch-off the accumulator 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. Weaken a collar, disconnect a tank from a bulk pipe. Remove a tank, pro-wash it and the filter of a reception tube with pure gasoline or hot water and blow compressed air.
Special attention needs to be paid on tightness of traffic jams of the fuel tanks. Dribble of fuel from under traffic jams is not allowed.

Note
The filter of a reception tube can be pro-washed, without removing a tank from the car, thus a tube with the filter take che-rez the hatch in a body floor.

Service of the fuel filter settler

Fig. 33. Fuel filter settler: 1 – laying; 2 – cover;
3 – bolt; 4 – laying of the filtering element; 5 – the filtering element; 6 – settler; 7 – stopper of a drain opening; 8 – a plate of the filtering element; and – openings in a plate for fuel pass;
– ledges in a plate; in – openings in a plate for racks (two openings in each plate)


Periodically merge a sediment of dirt and water through the drain opening closed by a stopper of 7 (fig. 33). Before the beginning of 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 pov-redit the filtering plates.

Service of the fuel pump

Fig. 34. Fuel pump B9V-B: 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 distributive shaft; 17 – drive lever axis; 18 – roller of the lever of manual pumping; 19 – lever of manual pumping; and – a control opening


Periodically delete dirt from a head of 13 (fig. 34) of the case of the fuel pump and wash out the mesh filter 8. At installation to the place of a cover 10 you watch safety of laying 9.
Dribble of fuel through a control opening and 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 time of year check pressure developed by the pump.
You carry out an inspection 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 check time disconnect the tube bringing fuel in the carburetor from it and connect to the manometer with a measurement limit up to 100 KPA
(1 kgf/cm2). Start-up and power supply of the engine are carried out at the expense of fuel 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 satisfy to the specified requirements, repair it or replace.

Service of the filter of thin purification of fuel

Fig. 35. Filter of thin purification of fuel:
1 – cover; 2 – bolt; 3 – the washer is sealing; 4, 5, 13 – laying; 6 – the filtering element;
7 – cap; 8 – spring; 9 – core; 10 – drain stopper; 11 – stopper; 12 – stopper of production of air


Periodically delete a sediment through the drain opening closed by a stopper of 10 (fig. 35) sort and check a condition of the filtering element 6, wash out a cap 7.
At assembly be convinced of lack of gaps and peelings of the filtering element, and also of serviceability of sealing laying.
Through 10 000 km of a run replace the filtering element.
To replace the filtering element:
– turn off a drain stopper and merge a part of fuel from the filter, then wrap a stopper;
– turn off a bolt of fastening of a cap of the filter, take off a cap and remove the polluted filtering element;
– wash out a cap gasoline;
– check and if necessary replace laying 5 and 13. At assembly of the filter do not mix laying. The top laying 5 has a figured opening;
– put the new filtering element in a cap;
– insert a bolt with a washer and if necessary new laying of a cap, establish a cap with the filtering element into place and tighten a bolt;
– launch the engine and be convinced of tightness of the filter.
Eliminate dribble of fuel with an inhaling of a bolt of fastening of a cap.

Service of the K-151L carburetor

Fig. 36. Scheme of the K-151L carburetor: 1 – cover; 2 – valve of disbalance of the float-operated camera; 3 – float; 4 – air jet of transitional system; 5 – emulsion jet of transitional system; 6 – screw of fastening of a spray of an ekonostat of the second camera; 7 – an air jet of the main dosing system of the second camera; 8 – spray of an ekonostat;
9 – an emulsion tube of the main dosing system of the second camera;
10 – final ball valve of the accelerating pump; 11 – spray of the accelerating pump; 12 – air gate; 13 – small diffuser of the first camera; 14 – an air jet of the main dosing system of the first camera; 15 – an emulsion tube of the main dosing system of the first camera; 16 – the block of an air jet with an emulsion tube of system of idling; 17 – emulsion jet of system of idling;
18 – air jet of idling; 19 – adjusting screw perepuska fuels of the accelerating pump; 20 – displacer; 21 – case of the float-operated camera; 22 – perepusknoy jet of the accelerating pump; 23 – final ball valve of the accelerating pump; 24 – spring; 25 – diaphragm of the accelerating pump; 26 – cover of the accelerating pump; 27 – lever of the drive of the accelerating pump; 28 – main fuel jet of the first camera;
29 – tube; 30 – diaphragm of the economizer of compulsory idling; 31 – economizer valve; 32 – restrictive cap; 33 – adjusting screw of composition of mix; 34 – an opening in the EPHH case; 35 – case of the economizer of compulsory idling; 36 – idling exhaust outlet of system; 37 – screw of operational adjustment of idling;
38, 45 – laying; 39 – openings transitional systems of idling;
40 – butterfly valve of the first camera; 41 – cam of the drive of the lever of the accelerating pump; 42 – roller of the lever of the accelerating pump; 43 – bypass channel of system of idling; 44 – throttle gate of the second camera; 46 – case of mixing cameras; 47 – a depression supply tube to the electromagnetic valve; 48 – a tube to vacuum коppектоpу; 49 – main fuel jet of the second camera; 50 – electronic block of management;
51 – mikrovyklyuchatel; 52 – filter; 53 – electromagnetic valve;
54 – union; 55 – fuel filter; 56 – toplivopodayushchy pipe; 57 – stopper; 58 – uvula of adjustment of the course of the fuel valve; 59 – fuel valve; 60 – a uvula of adjustment of level of fuel in the float-operated camera;
61 – electric drive of the valve of disbalance of the float-operated camera


The K-151L carburetor (fig. 36) – two-chamber, with the falling stream and the balanced float-operated camera.
The carburetor includes:
1. Semi-automatic system of start-up and warming up of the engine.
2. Autonomous system of idling with the economizer of compulsory idling (ECI).
3. Electromagnetic drive of disbalance of the float-operated camera.
The system of start-up and warming up corrects composition of mix after launch of the engine depending on depression in zadrosselnom space.
The autonomous system of idling provides decrease in a consumption of fuel and toxicity of the fulfilled gases.
Operate work of EPHH established on the car the electromagnetic valve 53 (see fig. 36), the control unit 50 and mikrovyklyuchatel 51, established on the carburetor.
The electronic block 50 provides short circuit of an electric chain of the elek-tromagnitny valve 53 with a frequency of rotation of a bent shaft less than 1000 min.-1 and disconnection of a chain – with a frequency more than 1300 min.-1. Mikrovyklyuchatel 51 closes a chain when pressing a pedal of control of the throttle gate and disconnects – at completely released pedal.
At the closed chain the valve 53 reports zadrosselnoye space with a diaphragm cavity of the valve 31 EPHH. Under the influence of depression the valve 31 is in open situation, providing receipt of an emulsion from system of idling.
At disconnection of a chain the valve 53 blocks the channel of giving of depression, the valve 31 is closed, prekra-shchy receipt of an emulsion from system of idling.
In such way, the valve 31 EPHH is open:
– at the open throttle gate (the pedal of an accelerator is pressed);
– at the closed throttle gate (the pedal is completely released) if the frequency of rotation of a bent shaft does not exceed 1000 min.-1.
The valve 31 EPHH is closed (the economy mode) when braking by the engine (the pedal is completely released) if the frequency of rotation exceeds 1300 min.-1, and remains in the closed situation until the frequency of rotation of a bent shaft decreases up to 1000 min.-1 (or the throttle gate will not be reopened yet).
At switching off of ignition the valve 31 also blocks giving of an emulsion from system of idling that excludes a possibility of spontaneous operation of the hot engine ("kalilny ignition").
For achievement of the greatest economy of fuel you watch that in the PHH mode the pedal of control of the throttle gate was completely released as at its slightest opening works mikrovyklyuchatel and EPHH is disconnected.
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 carry out an inspection 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 the fuel pump.

Fig. 37. Check of level of fuel


Fig. 38. 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 – fuel supply union; 10 – toplivoprovodyashchy bolt;
And – an emphasis; B – an earring ledge


Level of fuel (fig. 37) 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 M10x1-6g carving 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 and is regulated by a podgibaniye of a uvula of the 5th loop of a float (fig. 38) 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 carry out adjustment repeatedly.
If adjustment does not yield desirable result, it is necessary to check the float-operated mechanism. Usually the reasons of the raised or lowered fuel level in the float-operated camera are leakage 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 not less than for 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 small frequency of rotation of bent shaft 700-750 mines-1 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.
In use the car the small frequency of rotation 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 in inflow in a nest of a restrictive cap (напрессован on the screw) and again to adjust the small frequency of rotation of a bent shaft the screw of operational adjustment.
Full adjustment of the carburetor has to be carried out at car repair shop (with use of the gas-analytical equipment):
– 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. Adjust the screw of operational adjustment the small frequency of rotation of a bent shaft.
2. Previously having removed the restrictive plug, adjust the screw of composition of mix the content of carbon monoxide (SO) within 1,0–1,5%, the content of hydrocarbons (SN) at the same time should not exceed 1000 million-1.
3. Make sure that the picked-up position of screws ensures normal functioning of the engine at throttlings for what slightly open and sharply release a throttle. If at the same time stops or unstable operation of the engine are noted, then it is necessary or to increase the small 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. Increase rotation frequency up to 2400 min.-1. Contents WITH has to be no more than 1%, SN – no more
500 million-1.
After final adjustment install the restrictive plug on the adjusting screw of composition of mix and note its situation. Warm up the engine up to the temperature of cooling liquid of 80-85 °C and check contents WITH in the fulfilled gases idling. contents WITH should not be more than 4,5% at any position of the screw of toxicity which the restrictive plug allows to establish. Install the screw with the restrictive plug in noted situation.
Adjustment of small frequency of rotation of a bent shaft by means of screws of half-open of butterfly valves is not allowed.
Wash out carburetor details 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 which is beaten out on a head of each jet (from outside a vent) and contains value of nominal size of capacity of jets, ml/min.:

                         Cameras
                                                                                                                    The 1st        2nd
       block main жиклеров:........................ fuel........................       230 340
                                                                        air.........................       330 230
       block of jets of idling........... idling tube...         110 -
                                                                        the tube is emulsion.......         100 -
       block of jets single хода:.......... air..........................        190 -
                                                                        emulsion....................         210 -
       block of jets transitional sistemy:.toplivny......................... –         200
                                                                        air...........................–         270
                          
Service of the air filter

Fig. 39. Air filter: 1 – cover of the air filter; 2 – flame arrester; 3 – sealing laying; 4 – latches; 5 – a framework of the filtering element; 6 – the filtering element;
7 – collar


The air filter (fig. 39) – dry type with the replaceable filtering element from synthetic nonwoven material, is installed on a mudguard of a forward wheel from the right party ahead of the carburetor and connected to the last with the help of a rubber connecting hose.
Through 10 000 km of a run clear the filtering element and wash out a flame arrester grid. At operation of the car in the conditions of high dust content of air you carry out service through 1000 km of a run or at deceleration of power of the engine.
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 carry out dismantling of the filter in the following sequence: unfasten latches 4 and uncover the filter 1, take out a framework of the filtering element 5 with a flame arrester 2 and the filtering element 6, remove a collar 7 and pull together the filtering element from a framework, remove sealing laying 3 and take out a flame arrester.
You carry out assembly of the filter in the return sequence.
It is impossible to operate the filter with the damaged sealing laying 3.
Replacement of the filtering element is obligatory in the presence of breaks or prozhog, through 60 000 km of a run, after fifteen cleanings.
2 wash out a grid of a flame arrester one of solvents: white spirit, kerosene, turpentine.

Fig. 40. 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 – coupling bolt; 9 – bracket of fastening of a cover; 11 – airintaking sleeve


On a part of cars with the engine 421.10-10 the air filter presented in fig. 40 can be installed.
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 carry out assembly of the filter in the return sequence.
It is impossible to operate the filter with the removed flame arrester 4, damaged by a sealant 7 and the coupling 1.

Service of the inlet pipeline

Fig. 41. Scheme of heating of an inlet pipe: I – heating is switched off – "summer"; II – heating is included – "winter"


Periodically clear its vnut-renny surfaces of resinous deposits which reduce sections of inlet channels through passage and lead to deceleration of power of the engine. At seasonal service install the gate (fig. 41) in the relevant provision.

Service of the drive of control of the air gate of the carburetor

Fig. 42. Drives of control of air and throttle gates of the carburetor (UAZ-31601) and butterfly valve (UAZ-3160 and
- 31605): 1 – handle of control of the air gate of the carburetor (UAZ-31601); 2 – draft of the air gate (UAZ-31601); 3 – coupling hinged (UAZ-31601); 4 – lever of the drive of the air gate (UAZ-31601); 5 – draft of a butterfly valve of the carburetor (UAZ-31601); 6 – draft of a butterfly valve of throttle knot (UAZ-3160,
- 31605); 7 – emphasis; 8 – roller of the drive of a butterfly valve; 9 – pedal of the drive of a butterfly valve


Adjust the drive of the air gate, changing the place of fastening of draft of 2 (fig. 42) in the hinged coupling 3 of the lever 4 of the air gate. At the handle of 1 drive which is completely extended on itself the air gate has to be closed densely. At the handle pressed against the stop the air gate has to be completely open.
At hard movement of draft in a cover grease it with Litol-24 lubricant. For this purpose extend draft from a cover, having released previously the screw of fastening of thirst for the lever.

Service of the drive of a butterfly valve

Fig. 43. Adjustment of the drive of a butterfly valve of the carburetor: 1 – cable; 2 – a cable cover with an adjusting tip; 3, 4 – nuts


In use adjustment of a tension of a cable can be required. For this purpose turn off a nut of 3 (fig. 43) and tighten a nut 4.
On cars UAZ-3160 and-31605 after adjustment check throttle knot.
If the roller 8 was removed (see fig. 42), then at the subsequent assembly pay attention to the correct installation of an emphasis 7.

System of production of gases

Fig. 44. System of production of the fulfilled gases:
1 – laying of a flange of a reception pipe; 2 – pipe reception muffler; 3 – the pipe is intermediate; 4 – resonator; 5 – muffler; 6 – the pipe is exhaust


In operation process periodically check reliability of connections of a final collector, a reception pipe, the muffler, resonator and an exhaust pipe (fig. 44). Leakage of connections is not allowed and has to be eliminated at once. Tighten the "stuck" nuts, previously having moistened carving connections with kerosene.

Engine mount

Fig. 45. Back engine mount: 1 – arm; 2, 6,
9 – the washer is spring; 3, 7,
11 – bolts; 4 – engine support back; 5 – course limiter plate lower; 8 – nut;
10 – washer


Fig. 46. Forward engine mount: 1 – arm (left); 2, 6 – washers spring; 3, 7,
9 – bolts; 4 – plate; 5 – engine support;
8 – nut


The engine mount is carried out in three points on rubber pillows (fig. 45 and 46). A forward support of the engine are two arms established on the block of cylinders, as a back support serves the arm established on the transmission. Arms of a forward support are not interchanged.
Periodically check an inhaling of threaded connections of forward and back engine mounts.