2.3.5. Repair of engines 420.10-10, 421.10-10, 4213.10

The basis for dismantling and repair of the engine are: deceleration of power of the engine, pressure of oil, a compression in cylinders, sharp increase in a consumption of oil (over 450 g on 100 km of a run), smoking of the engine, the raised fuel consumption, and also noise and knocks.
At repair of engines it is necessary to consider their design features. At engines of models 4213.10 and 421.10-10 of a sleeve are filled in in the block of cylinders and are chiseled under the size of 100 mm (instead of 92 mm). The sizes of pistons, piston fingers and rings are respectively increased. Pistons have the combustion chamber in the bottom. Thickness of a wall of piston fingers is increased, length of rods is increased by 7 mm.
When dismantling the engine carefully check a possibility of further application of each its detail. Crete-rii according to a possibility of further use of details are provided in tab. 4.
Operability of the engine can be restored by replacement of worn-out details new the nominal size or restoration of worn-out details and application of the new details of the repair size interfaced to them.
For these purposes pistons, piston rings, inserts of conrod and radical bearings of a bent shaft, a saddle of inlet and final valves, plugs of a distributive shaft and a number of other details and sets of the repair sizes are issued. The list of details and sets nominal and the repair sizes is provided in tab. 5.

Values of gaps and tightnesses in the engine
Reduction or increase in gaps in comparison with recommended worsens conditions of lubricant of the rubbing surfaces and accelerates wear. Reduction of tightnesses in motionless (press) landings is also extremely undesirable. For such details as the directing plugs and plug-in saddles of final valves, reduction of tightnesses worsens transfer of heat from them to walls of a head of the block of cylinders. At repair of the engine use these tab. 6.

Removal and installation of the engine
Remove the engine in the following order:
1. Install the car on a viewing hole.
2. Switch-off the rechargeable battery.
3. Remove a cowl.
4. Merge liquid from the cooling system and oil from an engine case.
5. Disconnect the air filter.
6. Disconnect a reception pipe of the muffler from the engine.
7. Disconnect hoses of the cooling system, a heater, the oil heater, food and the vacuum amplifier of brakes from the engine.
8. Disconnect and remove a cooling system radiator.
9. Disconnect and remove the fan with the drive coupling.
10. If on the car the hydraulic booster of the steering mechanism is installed, take off a pump drive belt, disconnect the pump from an arm and take him aside.
11. Disconnect from the carburetor of draft of the drive of air and throttle gates (UAZ-31601). For UAZ-3160 and-31605 – draft of a butterfly valve.
12. If on the car the heater heater is established, disconnect a hose from the cooling system pump, a branch pipe of a supply of hot air to the engine pallet, remove collars, disconnect a heater heater and take him aside.
13. Disconnect all electrical wires from the engine.
14. Disconnect the working cylinder of the drive of switching off of coupling from a coupling case.
15. Establish a chalka on transport brackets of the engine.
16. Having raised the engine the elevator, turn out bolts of fastening of forward support of the engine from arms on the block and disconnect the transmission from the engine.
17. Lift the engine and remove it from the car, at the same time the transmission with the transfer case will remain on a car frame.
You carry out installation of the engine on the car in the return sequence.

Dismantling and assembly of the engine
Before dismantling carefully clear the engine of dirt and oil.
Sort and assemble the engine at the rotary stand by means of sets of the tool.
At an individual way of repair of the engine of a detail, suitable for further work, establish on former places where they were earned extra. For this purpose mark pistons, piston rings, rods, piston fingers, inserts, valves, bars, yokes and pushers at removal in any way which is not causing damage (kerneniyem, inscribing, paint, an attachment of labels, etc.).
At any kind of repair it is impossible razukomplektovyvat covers of rods with rods, to rearrange a case of coupling and a cover of radical bearings from one engine on another or to interchange the position of covers of average radical bearings in one block as these details are processed in common.
When replacing a case of coupling about-verte coaxiality of the opening serving for centering of a box of transfers with an axis of a bent shaft, and also perpendicularity of a back end face of a case of coupling concerning an axis of a bent shaft. When checking fix a rack of the indicator on a flange of a bent shaft. Coupling thus has to be removed. The beating of an opening and an end face of carat-tera should not exceed 0,08 mm.
After dismantling of the engine of a detail carefully degrease, clear of a deposit and resinous deposits.
Deposit from pistons, inlet valves and cameras of combustion delete in the mechanical or chemical way.
The chemical way of removal of a deposit consists in keeping of details in a bathtub with the solution which is warmed up to 80–95 °C within 2–3 hours.
Apply the following composition of water solution (g/l) to cleaning of aluminum details:
soda calcinated (Na2CO3)..... 18,5
soap economic or green..... 10
liquid glass (Na2SiO3)..... 8,5
Apply the following composition of water solution (g/l) to cleaning of steel details:
the caustic soda (NAON)..... 25
soda calcinated (Na2CO3)..... 33
soap economic or green..... 3,5
liquid glass (Na2SiO3)..... 1,5
After cleaning of a detail wash out more hotly (80–90 °C) water and an obduyta compressed air.
Do not wash out a detail from aluminum and zinc alloys in the solutions containing alkali (NAON).
At assembly of the engine observe the following:
1. Wipe and blow details compressed air, and oil all rubbing surfaces motor.
2. Carving details (hairpins, traffic jams, unions) if they were unscrewed or were replaced in repair process, establish on minium.
3. Establish one-piece connections (press-mer, a cap of the block of cylinders) on nitrolake.
4. Tighten a dynamometer key the required moment, N · m (kgf · l), the following nuts:
hairpins of fastening of a head of the block of cylinders..... 90–94 (9,0–9,4)
bolts of covers of rods..... 68–75 (6,8–7,5)
hairpins of fastening of covers of radical bearings of a bent shaft..... 125–136 (12,5–13,6)
bolts of fastening of a flywheel to a bent shaft..... 76–83 (7,6–8,3)

Repair of the block of cylinders
Interface of the wearing-out details is reached by generally replaceable details that allows to repair the block of cylinders regrinding or replacement of sleeves, replacement of inserts of radical bearings of a bent shaft. Maintenance of couple an opening of the block of cylinders pushers because of their insignificant wear comes down to replacement of pushers.
Operability of couples of opening of the block of cylinders support of the camshaft is restored by boring of openings in the block under installation of the plugs delivered in spare parts for repair.

Repair and replacement of sleeves of the block of cylinders of the engine of fashion. 420.10-10

Fig. 69. A stripper for vypressovki sleeves from the block of cylinders: 1 – stripper; 2 – sleeve; 3 – block of cylinders


The most admissible wear of sleeves of cylinders should be counted up increase in a gap between a sleeve and a skirt of the piston to 0,3 mm. At existence of such wear vypressuyte also chisel a sleeve from the block of cylinders by means of a stripper of 1 (fig. 69) to the closest repair size of the piston (see tab. 4) with the admission to processing of +0,06 mm.
Do not clamp when processing a sleeve in a cam cartridge as it will entail deformation of a sleeve and distortion of its sizes.
Fix a sleeve in adaptation representing itself the plug with landing corbels with a diameter of 100 and 108 mm. Insert a sleeve into the plug to an emphasis in the top fillet which clamp a laid on ring in the axial direction. After processing the mirror of the cylinder of a sleeve has to have the following deviations:
1. Ovality and conicity no more than 0,01 mm, and the bigger basis of a cone has to settle down in the lower part of a sleeve.
2. Barrel shape and korsetnost no more than 0,08 mm.
3. Beating of a mirror of the cylinder of rather landing corbels with a diameter of 100 and 108 mm no more than 0,01 mm.

Fig. 70. Measurement of a vystupaniye of a sleeve over the block plane


After a sleeve press fitting in the block of cylinders check the size of a vystupaniye of the top end face of a sleeve over the top plane of the block (fig. 70). The size of a vystupaniye has to be 0,005–0,055 mm. At an insufficient vystupaniye (less than 0,005 mm) laying of a head of the block can be punched; except that, cooling liquid because of insufficient consolidation of the top corbel of a sleeve with the block of cylinders will inevitably get to the camera of combustion. When checking size of a vystupaniye of an end face of a sleeve over the block it is necessary to remove a rubber sealing ring from a sleeve.

Fig. 71. A clip for sleeves: 1 – nut; 2 – washers; 3 – plug


That sleeves did not drop out of nests in the block at repair, fix them with the help of washers 2 (see fig. 71) and the plugs 3 which are put on hairpins of fastening of a head of the block of cylinders.
Replace the sleeves of cylinders chiseled under the third repair size of the piston after wear new.
Everything told is applicable also for the block of cylinders of engines of fashion. 421.10-10 and 4213.10. Chisel the sleeves of cylinders which are filled in in the block (not removable) on the machine directly in the block.

Repair of a head of the block of cylinders
To the main defects of a head of the block of cylinders which can be eliminated with repair treat a plane buckling prileganiya the block of cylinders, wear turned gray also the directing plugs of valves.
Nepryamolineynost the planes of the head adjoining to the block when checking by its probe on a control plate should not exceed 0,05 mm. An insignificant buckling of a head (to 0,3 mm) eliminate shabrovkoy the planes on paint. At korobleniyakh, the exceeding 0,3 mm, the head needs to be ground.

Replacement of piston rings
Replace piston rings through 70 000–90 000 km of a run (depending on car service conditions).
On each piston establish three rings: two compression and one oil scraper. Compression rings are cast from special cast iron. The external surface top a computer-ressionnogo of a ring is covered with porous chrome, a surface of the second compression ring – tin.

Fig. 72. Installation of rings on the piston: 1 – piston; 2 – compression rings; 3 – ring disks; 4 – axial dilator; 5 – radial dilator;
6 – temperature-controlled insert


On internal cylindrical surfaces of both compression rings are provided protochki at the expense of which rings after their installation in working situation are a little unscrewed (fig. 72). It improves and accelerates them to extra earnings to cylinders. Rings need to be installed on the piston protochkami up, in the party of the bottom.
The oil scraper ring compound, has two ring disks, radial and axial dilators. The external surface of disks of oil scraper rings is covered with solid chrome.
Lock of rings of a straight line.
Piston rings of the repair sizes (see tab. 7) differ from rings of the nominal sizes only in external diameter.
Rings of the repair size can be installed in worn-out cylinders with the next smaller repair size by a podpilivaniye of their joints before receiving a gap in the lock 0,3–0,5 mm (0,3–0,65 mm for engines of fashion. 421.10-10 and 4213.10).

Fig. 73. Selection of piston rings for the cylinder (check of a side gap in the ring lock)


You carry out an inspection of a side gap in the lock of a ring, as shown in fig. 73. To pereshlifovannym to cylinders adjust rings by the top part, to worn out – on the lower part of the cylinder (in limits of the course of piston rings). At adjustment install a ring in the cylinder in working situation, i.e. in the plane, a perpendicular axis of the cylinder for what advance it in the cylinder with the help of a head of the piston. The planes of joints at the compressed ring have to be parallel.

Fig. 74. Removal and installation of piston rings


Remove and install rings on the piston by means of adaptation (fig. 74) of fashion. 55-1122.

Fig. 75. Check of a side gap between a piston ring and a flute of the piston


After adjustment of rings on cylinders check a side gap between rings and flutes in the piston (fig. 75) which has to be for the top compression ring of 0,050-0,082 mm, for lower – 0,035–0,067 mm. At big gaps replacement only of piston rings will not exclude the raised oil consumption because of intensive transfer by its rings in space over the piston. In this case at the same time with replacement of rings replace also pistons (see. "Replacement of pistons"). Simultaneous replacement of piston rings and pistons sharply reduces an oil consumption.

Fig. 76. Cleaning of flutes of piston rings of a deposit


When replacing only of piston rings without replacement of pistons delete a deposit from the bottoms of pistons, from ring flutes in the head of the piston and maslootvodyashchy openings located in flutes for oil scraper rings. Delete a deposit from flutes carefully not to damage their side surfaces, with the help of adaptation (fig. 76).
Delete a deposit from maslootvodyashchy openings with a drill with a diameter of 3 mm.
When using new or pereshlifovannykh under the repair size of sleeves of cylinders it is necessary that the top compression ring was chromeplated, and other rings – tinned or fosfatirovannye. If the sleeve is not under repair, and only piston rings change, then all of them have to be tinned or fosfatirovannymi as to a worn-out sleeve the chromeplated ring is earned extra very badly.
Before installation of pistons in cylinders part joints of piston rings at an angle 120 ° to each other.
Having replaced piston rings, the first 1000 km of a run support the frequency of rotation of a bent shaft of the engine no more than 3000 min.-1.

Replacement of pistons
Replace pistons at wear of a flute of the top piston ring or a skirt of the piston.
Install pistons of the same size in partially worn-out cylinders (nominal or repair) what the pistons which were earlier working in this engine had. However it is desirable to pick up a set of the bigger size of pistons for reduction of a gap between a skirt of the piston and a mirror of the cylinder.
In this case check a gap between a skirt of the piston and a mirror of the cylinder - those in the lower, least worn-out part of the cylinder.
Do not allow reduction of a gap in this part of the cylinder less than 0,02 mm.
In spare parts pistons together with the piston fingers and lock rings which are picked up to them are delivered (see tab. 5).
For selection pistons of the nominal size sort by the external diameter of a skirt. On the bottoms of pistons alphabetic references of dimensional group which are specified in tab. 7 are beaten out.
On pistons of the repair sizes also their diameter is beaten out.
Except selection of pistons to cylinder sleeves on diameter of a skirt they are selected also for weight. The difference in the mass of the easiest and heaviest pistons for one engine should not exceed 4 g.
At assembly install pistons in sleeves of the same group.

Fig. 77. The device for installation in the piston cylinder with rings


Install pistons in cylinders by means of adaptation shown in fig. 77.
At installation of pistons into cylinders the tag "before" cast on the piston has to be turned to a forward part of the engine, on the piston with a cutting skirt a tag "back" – into the party of a case of coupling.
On all pistons of the repair sizes of an opening in lugs under a piston finger become the nominal size with breakdown on groups. At need these openings are chiseled or developed to the next repair size with the admission of-0,005 - 0,015 mm. Conicity and ovality of an opening – no more than 0,0025 mm. When processing provide perpendicularity of an axis of an opening to a piston axis, a permissible deviation – no more than 0,04 mm on length of 100 mm.

Repair of rods
Repair of rods comes down to replacement of the plug of the top head and its subsequent processing under a piston finger of the nominal size or to processing of the plug which is available in a rod under a finger of the repair size.
In spare parts the plugs of one size manufactured of the bronze film OTsS4-4-2,5 1 mm thick are delivered.
At a press fitting of the new plug in a rod provide coincidence of an opening in the plug with an opening in the top head of a rod. Openings serve for supply of lubricant to a piston finger.
After a press fitting of the plug condense its internal surface with a smooth brooch to diameter of 24,3+0,045 mm, and then develop or chisel under the nominal or repair size with the admission +0,007 - 0,003 mm.
For example, deploy the plug or chisel under a finger of the nominal size to diameter of 25+0,007 - 0,003 mm or under a finger of the repair size to diameter of 25,20+0,007 - 0,003 mm.
The distance between axes of openings of the lower and top heads of a rod has to be (168±0,05) mm, (175±0,05) mm – for engines of models 421.10-10 and 4213.10; admissible neparallelnost axes in two mutually perpendicular planes at distance of 100 mm has to be no more than 0,04 mm; ovality and conicity should not exceed 0,005 mm. To vyder-press the specified sizes and admissions, deploy the plug of the top head of a rod in the conductor.

Fig. 78. Operational development of an opening in the top head of a rod: 1 – derzhavka; 2 – grinding head; 3 – clip


After expansion you lead up openings on a special grinding head, holding a rod in hands (fig. 78). Establish grinding whetstones of a head mikrometricheskim by the screw on the required repair size.
Rods which openings under inserts in the lower head have ovality more than 0,05 mm are subject to replacement.

Replacement and repair of piston fingers
The repair sizes of piston fingers and number of sets are specified in tab. 5.
The piston fingers increased on diameter by 0,08 mm are applied to replacement of piston fingers without preliminary processing of otvers-tiya in the piston and in the top head of a rod. Application of the fingers increased by 0,12 and 0,20 mm demands preliminary processing of openings in lugs of the piston and in the top head of a rod as it is described above (see the subsections "Replacement of Pistons" and "Repair of Rods").

Fig. 79. Removal of a lock ring of a piston finger



Fig. 80. Adaptation for vypressovki and press fittings of a piston finger: 1 – guide; 2 – finger; 3 – plunger


Before vypressovkoy a piston finger take from the piston lock rings of a piston finger flat-nose pliers, as shown in fig. 79. Vypressovku and a press fitting of a finger you see off on adaptation, as shown in fig. 80. Before vypressovkoy a finger heat the piston in hot water to 70 °C.
Repair of piston fingers consists in pereshlifovke them from the big repair sizes on smaller or in chromium plating with the subsequent processing under the nominal or repair size.
Fingers with breaks, vykrashivaniyami and cracks of any size and an arrangement, and also traces a feather-greva (color of a pobezhalost) are not subject to repair.

Assembly conrod поpшневой groups

Fig. 81. Selection of a piston finger


Piston finger to the top head of a rod select 0,0045 - 0,0095 mm with a gap. At a normal room temperature the finger has to move smoothly in an opening of the top head of a rod from effort of a thumb of a hand (fig. 81). The piston finger thus has to be slightly oiled by low-viscous.
Finger install in the piston with a tightness 0,0025–0,0075 mm. Almost piston finger is selected in such way that at a normal room temperature (20 °C) it would not enter the piston from effort of a hand, and when heating the piston in hot water up to the temperature of 70 °C would enter it freely. Therefore before assembly heat the piston in hot water to
70 °C. The finger press fitting without preliminary heating of the piston will lead to damage of a surface of openings in piston lugs, and also to deformation of the piston. Conrod поpшневой groups you carry out assembly on the same adaptation, as dismantling (see fig. 80).
For ensuring the correct balancing of the engine the difference of mass of the pistons installed in the engine in collecting with rods should not exceed 8 g.
Lock rings of a piston finger have to sit in the flutes with a small tightness.

Note
Do not apply the rings which were in the use.

Install piston rings on the piston as it is specified in the subsection "Replacement of Piston Rings".
Considering complexity of selection of a piston finger to the piston and a rod (for ensuring nominal landings), pistons are delivered in the spare part in collecting with a piston finger, lock and piston rings.

Repair of a bent shaft
Repair of a bent shaft consists in pereshlifovke radical and conrod necks under the next repair size.
The repair sizes of conrod and radical necks are defined by the sizes of sets of the connecting and radical rods delivered in spare parts (see tab. 5).
Radial gaps in conrod and radical bearings of a bent shaft have to be 0,020–0,049 mm and 0,020–0,066 mm respectively. Re-grinding of necks you carry out 0,013 mm with the admission.
If the sizes of conrod and radical necks do not coincide among themselves, them it is necessary pereshlifovat under one repair size.
Facets and openings of the forward and back ends of a bent shaft are not suitable for installation in the grinder. For this purpose make the removable centers glasses. The forward center napressuyte on a neck with a diameter of 38 mm, and back align on the external diameter (80 mm) of a flange of a shaft and you fix to it bolts. At production of the transitional centers provide concentricity of center and adjusting openings. Without meeting this condition, it is impossible to provide necessary coaxiality of seats of a flywheel and a gear wheel with axes of radical necks.
When grinding conrod necks establish a shaft on the additional centers, coaxial axes of conrod necks. For this purpose it is possible to use the centers glasses, having provided on them flanges with two additional center openings remote from an average opening on (46±0,05) mm.
For the forward end it is better to make the new center flange which is established on a neck with a diameter of 40 mm (on a spline) and in addition is fixed by a bolt (ratchet) screwed in a carving opening.
Before grinding of necks deepen facets on edges of oil channels so that their width after removal of all allowance for grinding was 0,8–1,2 mm. Do it by means of an emery stone with a corner at top 60–90 °, brought into rotation by the electric drill.
When grinding conrod necks do not concern a grinding circle of side surfaces of necks not to break an axial gap of rods. Radius of transition to a side surface maintain 3,5 mm. You make grinding with plentiful cooling with an emulsion.
In process pereshlifovki maintain:
1. Distance between axes of radical and conrod necks (46±0,05) mm.
2. Conicity, barrel shape, saddle shape, ovality and facet of necks no more than 0,005 mm.
3. Angular arrangement of conrod necks ±0 °10'.
4. Neparallelnost axes of conrod necks with an axis of radical necks no more than 0,012 mm on all length of a conrod neck.
5. A beating (at installation of a shaft extreme radical necks on prisms) average radical necks no more than 0,02 mm, necks under a distributive gear wheel – to 0,03 mm, and necks under a nave of a pulley and a back epiploon – to 0,04 mm.
After grinding of necks wash out a bent shaft, clear oil channels of an abrasive and resinous deposits. gryazeuloviteley thus turn out traffic jams. After cleaning gryazeuloviteley and channels wrap traffic jams into place and zakernite each of them from a spontaneous vyvertyvaniya again.
Clear oil channels and at operational repair of the engine when you take out a bent shaft from the block.
After repair collect a bent shaft with the same flywheel and coupling which stood before repair.
Before installation on the engine dynamically balance a bent shaft with coupling in collecting on the special machine. Previously center the conducted clutch plate with the help of a shaft of a box of transfers or a special mandrel.
Eliminate an imbalance with drilling of metal in a flywheel rim on the radius of 158 mm a drill with a diameter of 12 mm. Depth of drilling should not exceed 12 mm, the minimum distance of openings between centers
14 mm. An admissible imbalance of no more than 35 гс · see.

Replacement of inserts of radical and conrod bearings of a bent shaft
In spare parts inserts of radical and conrod bearings nominal and seven repair sizes which are specified in tab. 5 are delivered. Inserts of the repair sizes differ from inserts of the nominal size in the internal diameter reduced by 0,05 mm; 0,25; 0,50; 0,75; 1,0; 1,25 and 1,50 mm.
Replace inserts of radical and conrod bearings without any adjustment.
Depending on wear of necks at the first replacement of inserts apply inserts nominal or in an extreme case of the first repair size (reduced by 0,05 mm).
And the subsequent repair sizes install inserts of the second in the engine only after pereshlifovki necks of a bent shaft.
If in result repeated pereshlifovok diameters of necks of a bent shaft are reduced so that inserts of the last repair size will be unsuitable for it, then collect the engine with a new shaft.
Values of a radial gap in conrod and radical bearings of a bent shaft have to be respectively 0,020-0,049 mm and 0,020–0,066 mm.
Check a radial gap by means of a set of the control probes executed from a copper foil 0,025 mm thick; 0,05; 0,075 and 0,1 mm cut in the form of strips 6-7 mm wide and a little less than width of insert long. Edges of probes have to be smoothed out for an exception of damage of a surface of an insert.
You carry out an inspection of a radial gap in the following order:
1. Remove from the checked neck a cover with an insert and put previously oiled control probe 0,025 mm thick across an insert.
2. Establish into place a cover with an insert and tighten bolts, thus bolts of other covers have to be released.
3. Turn a bent shaft a hand on a corner no more than on 60-90 ° not to damage an insert surface the probe.
If the shaft is turned too easily, the gap more than 0,025 mm means. In this case repeat check by probes 0,05; 0,075 mm, etc. till that time until it becomes impossible to turn a bent shaft.
Probe thickness at which the shaft is turned with notable effort is considered equal to the actual gap between an insert and a neck of a bent shaft.
When replacing inserts observe the following:
1. Replace inserts without subracing operations.
2. You watch that the fixing ledges on joints of inserts freely (from effort of a hand) entered grooves in shaft beds.
3. At the same time with replacement of inserts clear gryazeuloviteli in conrod necks.
Connecting rods can be replaced, without removing the engine from the car, radical inserts – on the engine removed from the car chassis.
After replacement of inserts roll the engine as it is specified in the subsection "Engine Running in after Repair".
If when replacing inserts the engine was not removed from the car, then on an extent of the first 1000 km of a run the frequency of rotation of a bent shaft of the engine should not exceed 3000 min.-1.
At the same time with replacement of inserts check an axial gap in the persistent bearing of a bent shaft which has to be 0,075–0,175 mm. If an axial gap more than 0,175 mm, replace washers of 7 (fig. 82) and 8 new. The forward washer is made four sizes on thickness: 2,350– 2,375; 2,375–2,400; 2,400–2,425; 2,425–2,450 mm.

Fig. 83. Check of an axial gap of a bent shaft


For check of a gap in the persistent bearing insert the screw-driver (fig. 83) between the first crank of a shaft and a forward wall of the block and wring out a shaft by the back end of the engine. Then determine by the probe a gap between an end face of a back washer of the persistent bearing and the plane burta the first radical neck.
Before installation of inserts check coaxiality of radical necks of a bent shaft (a deflection arrow). For this purpose establish a bent shaft in the centers and check the provision of axes of radical necks according to indications of the indicator.

Fig. 82. Forward end of a bent shaft:
1 – epiploon; 2 – pulley nave; 3 – damper nave; 4 – laying; 5 – pulley damper; 6 – persistent washer; 7 – forward washer; 8 – back washer; 9 – pin; 10 – pulley of the hydraulic booster of the steering mechanism


Fig. 84. Back end of a bent shaft: 1 – block of cylinders; 2 – bent shaft; 3 – samopodzhimny epiploon; 4 – epiploon cover; 5 – flywheel


The forward and back ends of a bent shaft are condensed with epiploons (fig. 82 and 84).

Repair of the camshaft and replacement of its plugs
Opening of the block neck of the camshaft you carry out restoration of necessary gaps in couple by boring of openings in the block under the plugs delivered in spare parts, being guided by these tab. 6, and the subsequent press fitting of plugs of the nominal or repair size with the subsequent their boring under repolished necks of the camshaft. It is possible to carry out regrinding of basic necks of the camshaft to reduction of their size no more than on 1,5 mm.
Before pereshlifovkoy necks deepen flutes on the first and last necks at a size of reduction of diameter of these necks in order that later pereshlifovki necks to provide intake of lubricant to distributive gear wheels and an axis of yokes. Grinding of necks you carry out in the centers with the admission 0,02 mm. After grinding of a neck polish.
It is more convenient to press plugs by means of carving hairpins (the corresponding length) with nuts and podkladny washers.
Poluobrabotannye the plugs of a distributive shaft delivered in spare parts by a set on one engine have the sizes of external diameter same, as well as plugs of the nominal size therefore they are pressed in block openings without preliminary processing.
For ensuring sufficient thickness of a layer of babbit (antifrictional material) the size of repair reduction of internal diameter of all plugs has to be identical.
At a press fitting of plugs you monitor coincidence of their side openings to oil channels in the block. Chisel plugs, reducing diameter of each subsequent plug, beginning from a forward end face of the block, on 1 mm. Boring conduct with the admission +0,050 +0,025 mm that gaps in plugs after installation of a shaft corresponded to these tab. 6.
When boring plugs and openings in the block under plugs maintain distance between axes of openings under cranked and distributive shaft (118±0,025) mm. Check this size at a forward end face of the block. The deviation from coaxiality of openings in plugs has to be no more than 0,04 mm, and a deviation from parallelism of cranked and distributive shaft – no more than 0,04 mm on all length of the block. To provide coaxiality of plugs in the set limits, process them at the same time with the help long and rather rigid pine forest bar with the cutters or development got on it on number of support. Establish borshtangu, being based concerning openings for inserts of radical bearings.
Smooth out cams of a distributive shaft at insignificant wear and teases a grinding skin: at first coarse-grained, and then fine-grained. Thus the grinding skin has to cover not less than a half of a profile of a cam and have some tension that will provide the smallest distortion of a profile of a cam. At wear of cams on height more than replace a distributive shaft with 0,5 mm new.
Check curvature of a distributive shaft the indicator on napes (on a cylindrical surface) inlet and final cams of the second and third cylinders. Thus establish a shaft in the centers. If the beating of a shaft exceeds 0,03 mm, then correct a shaft or replace.

Restoration of tightness of valves and replacement of plugs of valves
Violation of tightness of valves at the correct gaps between cores of valves and yokes, and also during the correct work of a karbyu-rator and system of ignition obna-ruzhivatsya on characteristic cottons in the muffler and the carburetor. The engine thus works with interruptions and does not develop full capacity.
Restore tightness of valves grinding in of working facets of valves to their saddles. At existence on working facets of valves and saddles of sinks, ring developments or risok which cannot be removed at-tirkoy, proshlifuyte facets with the subsequent grinding in of valves to saddles. Replace valves with the jarred-on heads.

Fig. 85. Grinding in of valves


Grind in facets of valves a special pneumatic or elekt-richesky drill or manually with the rotation help. You carry out grinding in by the vozvratno-vrashchatelny movements at which the valve is turned in one party slightly more, than in another. For grinding in time under the valve establish a squeezing spring with small elasticity. Internal diameter of a spring has to be about 10 mm. The spring has to a few at - to lift the valve over a saddle, and by easy pressing the valve has to sit down on a saddle. Contact of the tool with the valve is carried out by a rubber sucker, as shown in fig. 85. For the best coupling of a sucker with the valve of their surface have to be dry and pure.
For acceleration of grinding in use pritirochnuyu the paste made of one part mikroporoshka the M20 brand and two parts of motor oil. Carefully mix mix before application. Conduct grinding in before emergence on working surfaces of a saddle and a plate of the valve of a uniform opaque facet on all circle. By the end of grinding in reduce contents mikroporoshka in pritirochnoy to paste. Finish grinding in on one pure oil. Instead of pritirochnoy pastes it is possible to use the emery powder No. 00 mixed with motor oil.
It is recommended to use the special grinder to grinding of working facets of valves. Thus clamp a core of the valve in the aligning boss of the grandma established at an angle 44 °30' to a working surface of a grinding stone. Reduction on 30' a tilt angle of a working facet of a head of the valve in comparison with a corner of a facet of saddles accelerates to extra earnings and improves tightness of valves. When grinding remove the minimum quantity of metal from a valve head facet. Height of a tsilind-richesky corbel of a working facet of a head of the valve after grinding has to be not less than 0,7 mm, coaxiality of a working facet concerning a core in limits of 0,03 mm of the general indications of the indicator, a valve core beating no more than 0,02 mm. Replace valves with a big beating new. Not pereshlifovyvayte valve cores on the smaller size as there will be a need for production of new crackers and plates of valvate springs.

Fig. 86. Device for grinding of saddles of valves: 1 – time-reznaya plug; 2 – op-ravka; 3 – grinding circle; 4 – lead washer; 5 – the directing plug; 6 – head case; 7 – pin;
8 – lead; 9 – tip; 10 – flexible shaft; 11 – electric motor shaft; 12 – electric motor


Grind facets of saddles at an angle 45 ° coaxially to an opening in the plug. Width of a facet has to be 1,6–2,4 mm. For grinding of saddles it is recommended at - to change adaptation represented in fig. 86. A saddle grind without pritirochnoy pastes or oils till that time until the stone begins to process all working surface.
After rough processing replace a stone with fine-grained and carry out fair grinding of a saddle. The facet beating concerning an axis of an opening of the plug of the valve should not exceed 0,03 mm. Replace worn-out saddles new. In spare parts the saddles of valves having external diameter are delivered it is more nominal on 0,25 mm. Take worn-out saddles from a head by means of a vertical drill.
After extraction of saddles chisel in a nest head for the final valve to diameter of 38,75+0,025 mm and for the inlet valve to diameter of 49,25+0,025 mm. Before a press fitting of saddles heat a head of the block of cylinders to temperature of 170 °C, and cool saddles with artificial ice. Carry out a press fitting quickly, without giving the chance to saddles to heat up. The cooled-down head densely covers saddles. For increase in durability of landing of saddles fuller them on external diameter with the help of a flat mandrel, trying to obtain filling of a facet of a saddle. Then proshlifuyte to the required sizes also grind in.
If wear of a core of the valve and a guide of the plug is so big that the gap in their joint exceeds 0,25 mm, then restore tightness of the valve only after replacement of the valve and its plug. In spare parts valves only of the nominal sizes, and the directing plugs – with the internal diameter reduced by 0,3 mm for the subsequent their development under the final size after a press fitting in a head of the block of cylinders are delivered.
Develop the pressed plugs to diameter of 9+0,022 mm. Diameter of a core of the inlet valve of 9-0,050 - 0,075 mm, final 9-0,075 - 0,095 mm, therefore, gaps between cores of inlet and final valves and plugs have to be respectively 0,050-0,097 and 0,075–0,117 mm.

Fig. 87. Drift of plugs of valves: And – temper the specified surface


Press off the worn-out directing plugs from a head of the block of cylinders by means of the drift shown in fig. 87.
Press the new plug from the party of yokes by means of the same drift to an emphasis in a lock ring on the plug. Thus, as well as at a press fitting of saddles of valves, heat a head of the block of cylinders to temperature of 170 °C, and cool the plug with artificial ice.
After replacement of plugs of valves proshlifuyte saddles (aligning on openings in plugs) and then grind in to them valves. After grinding of saddles and grinding in of valves all channels and places where the abrasive could get, carefully wash out and blow compressed air.
Plugs of valves – ceramic-metal, porous. After final processing and washing impregnate them with oil. For this purpose insert into each plug at several o'clock the felt match impregnated in veretennom oil. Grease cores of valves before assembly with a thin layer of the mix prepared from seven parts oil colloidal гpафитного medicine and three parts of motor oil.

Replacement of valvate springs
Elasticity reduction, fiascos or cracks on rounds can be the possible malfunctions of valvate springs appearing in operation process.
Elasticity of valvate springs to a prove-ryayta when dismantling the valvate mechanism. The effort necessary for compression of a new valvate spring to 46 mm on height has to be 273–317 N (27,3 - 31,7 kgfs), to 37 mm – 700–800 N (70–
80 kgfs). If, and to 37 mm less than 570 N (57 kgfs), then such spring replace effort of compression of a spring to 46 mm on height less than 240 N (24 kgfs) new.
Replace springs with fiascos, cracks and traces of corrosion new.

Replacement of pushers
The directing openings in the block under pushers wear out slightly therefore restore a nominal gap in this interface replacement of worn-out pushers with new. In spare parts pushers only of the nominal size are delivered.
Pushers select to openings with a gap 0,040–0,015 mm. Pushers depending on the size of external diameter are broken into two groups and are marked by a branding: in figure 1 – with a diameter of 25-0,008 - 0,015 mm and figure 2 – with a diameter of 25-0,015 - 0,022 mm. Correctly picked up pusher oiled by liquid mineral has to fall smoothly under own weight to a nest of the block and it is easy to be turned in it.
Replace the pushers having at end faces of plates beam teases, wear or vykrashivaniye a working surface new.

Repair of the drive of the distributor

Fig. 88. Drive of the oil pump and distributor of ignition: 1 – roller of the oil pump;
2 – plug; 3 – intermediate roller; 4 – pin; 5 – drive gear wheel; 6 – gear wheel of a distributive shaft; 7 – persistent washer; 8 – block of cylinders; 9 – laying; 10 – drive roller; 11 – drive case; 12 – ignition distributor drive; the provision of a cut of the roller A – on the drive installed on the engine; B – on the drive before its installation on the engine; In – on the roller of the oil pump before installation of the drive on the engine


The roller 10 (fig. 88) of the drive of the distributor which is worn out on diameter is restored by chromium plating with the subsequent grinding to diameter of 13-0,011 mm.
Replace the gear wheel of the 5th drive of the distributor having fiascos, vykrashivaniya or considerable developments of a surface of teeths, and also wear of an opening under a pin to the size more than 4,2 mm new.
For replacement of the roller or a gear wheel of the drive of the distributor remove a gear wheel from the roller, having taken out previously a gear wheel pin with the help a small beard with a diameter of 3 mm. At removal of a gear wheel from the roller install the case 11 of the drive top tortsem on a support with an opening in it for pass of the roller of the drive in collecting with the persistent plug.
You carry out assembly of the drive taking into account the following:
1. At installation of the roller (in collecting with the persistent plug) in the case of the drive of the distributor oil the roller motor.

Fig. 89. The provision of a gear wheel of the drive on the roller: B – a gear wheel tooth end face; About – the axis passing through the middle of hollows of teeths


2. Having connected the drive roller 10 to the intermediate roller plate 3 drives and having put on a persistent washer 7, napressuyte a gear wheel the roller, having sustained a gap between a persistent washer and a gear wheel of the drive of 0,25-0,15-0,10 mm (fig. 89).
Thus it is necessary that the axis of Au-oh, passing through the middle of hollows between two teeths at an end face of B was displaced concerning an axis V-in a roller vent on 5 °30 '±1 °.
3. An opening in a gear wheel and the roller under a pin you drill diameter (4±0,037) mm, maintaining distance from an opening axis to an end face of a gear wheel (18,8±0,15) mm.
When drilling an opening and at installation of a gap between a persistent washer and a gear wheel the distributor drive roller in collecting with the persistent plug has to be pressed to the drive case in the direction of the oil pump. The pin connecting the roller to a gear wheel has to have a diameter of 4-0,025 mm and 22 mm long.
In the assembled drive of the distributor its roller has to be turned freely from a hand.

Repair of the oil pump
At big wear of details of the oil pump pressure in the lubrication system goes down and noise appears. When dismantling the pump check elasticity of a spring of the reducing valve which is considered sufficient if for compression it to 24 mm on height it is necessary to put effort (55±2,5) N or (5,5±0,25) kgfs.
Repair of the oil pump usually consists in grinding of end faces of covers, replacement of gear wheels and laying.
When dismantling the pump previously drill rasklepannuyu a head of a pin of fastening of the plug 2 (see fig. 88) on the roller 1, beat out a pin, remove the plug and a cover of the pump. After that take out the pump roller together with the leading gear wheel from the case in the party of its cover.
In case of dismantling of the leading gear wheel and the roller drill a pin a drill with a diameter of 3 mm.
The conducting and conducted gear wheels with vykroshennymi teeths, and also with noticeable developments of a surface of teeths replace new. The conducting and conducted gear wheels installed in the pump case have to be turned easily from a hand for the leading roller.
If on an internal surface of a cover there is considerable (more than 0,05 mm) a development from end faces of gear wheels, proshlifuyte it.
Between a cover, a plate and the case of the pump are established paronitovye laying 0,3-0,4 mm thick.
Use of shellac, paint or other pressurizing substances at laying installation, and also installation of thicker laying is not allowed as it causes reduction of giving of the pump.
Collect the pump taking into account the following:

Fig. 90. Fastening of the plug on the roller of the oil pump


1. Napressuyte on the leading roller the plug, having sustained the size between end faces of the leading roller and plug of 8 mm (fig. 90). Thus the gap between the case of the pump and other end face of the plug has to be not less than 0,5 mm.
2. Drill in the leading roller and in the plug an opening with a diameter of 4+0,03-0,05 mm, maintaining the size of (20±0,25) mm.
3. Razzenkuyte an opening from both parties on depth of 0,5 mm at an angle 90 °, press in it a pin with a diameter of 4-0,048 mm and 19 mm long and rasklepayte it from two parties.
If operability of the pump by means of repair cannot be restored, then replace it new.
Install the drive of the oil pump and the distributor of ignition on the block in the following order:
1. Turn out a candle of the first cylinder.
2. Establish in an opening for a candle kompressometr and turn the starting handle a bent shaft prior to the movement of an arrow. It will occur at the beginning of a compression step in the first cylinder. It is possible to stop up an opening for a candle with a paper pyzh or a thumb of a hand. In this case in a step of compression will jump out пыж or the air outlet from under a finger will be felt.
3. Having convinced that compression began, carefully turn a bent shaft before coincidence of an opening on a rim of a pulley of a bent shaft with the index (pin) on a cover of distributive gear wheels.
4. Turn the drive roller that the cut at its end face for a thorn of the distributor was located as it is specified fig. 88B, and with the help of the screw-driver turn the roller of the oil pump in the situation specified fig. 88B.
5. Carefully, without touching with a gear wheel block walls, insert the drive into the block. After installation of the drive to the place of its roller has to reach the position specified fig. 88A.

Fig. 91. A mandrel for centering of the oil pump


For reduction of wear in hinged connections of the drive install the pump coaxially to an opening for the drive. For this purpose use the mandrel (fig. 91) which is densely entering an opening for the drive in the block and having a tsilind-richesky shaft with a diameter of 13 mm. Center the pump on a shaft of a mandrel and enshrine in this provision.

Repair of the pump of the cooling system
Can be possible malfunctions of the pump (fig. 92) to flow liquids through an epiploon krylchatki in result of wear of a sealing washer or destruction of a rubber cuff of an epiploon, wear of bearings, fiascos and cracks krylchatki.

Fig. 93. Removal krylchatki pump


Eliminate dribble of liquid from the pump with replacement of an epiploon of the pump. For replacement of an epiploon remove the pump from the engine, disconnect it from a cover, remove adaptation 71-1769 krylchatku (fig. 93).

Fig. 94. Removal of a nave of a pulley of the fan


By means of adaptation (fig. 94) remove a nave of the 6th pulley of the fan (see fig. 92) and a vypressuyta the roliko-ball bearing 5. Before a bearing vypressovka surely turn out a clamp 9. An epiploon 3 also replace Vypressuyte.

Fig. 92. Engine cooling system pump: 1 – roller; 2 – pump case; 3 – epiploon;
4 – krylchatka; 5 – roliko-ball bearing; 6 – fan pulley nave; 7 – belt;
8 – pulley; 9 – clamp; 10 – case cover
pump


You carry out assembly of the pump in the return sequence. At the same time press a nave of a pulley of the fan against the stop in a fillet, and a krylchatka – to the size 117,4 (see fig. 92).
Before assembly grease the part of the roller of the roliko-ball bearing interfaced to an epiploon with soap, and the end face of a krylchatka adjoining to an epiploon – graphitic lubricant.
At installation of the assembled pump pay attention to suitability of paronitovy laying between a cover and a pump housing to the engine.

Repair of the fuel tanks
Violation of tightness because of formation of the cracks, holes or other damages arising in operation process can be possible malfunction of tanks. For repair remove a tank from the car, clear of dirt and wash out outside.
For detection of malfunction on-gruzite a tank with water also give to a bathtub in a tank compressed air under pressure of 30 kPa (0,3 kgfs/cm2). All openings of a tank need to be muffled previously. In places of violation of a germe-tichnost the tank will leave vials of air. Note all damages paint.
Then completely sort a tank, carefully wash out it go-ryachy water for removal of vapors of gasoline from within and blow compressed air. Solder small cracks soft solder. On big cracks and about-boiny impose metal patches. Seal of cracks by means of epoxy pastes and imposing of multilayered patches from fiber glass fabric is possible. After repair test a tank for tightness.

Repair of the fuel pump
Possible malfunctions of the pump – violation of tightness of a diaphragm and valves, decrease in elasticity or breakage of a spring of a diaphragm, wear of details of the drive of the 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


For dismantling of the pump remove from it a cover 10 (see fig. 34), laying 9 and the filter 8. Then unscrew screws of fastening of a head of the 13th case, separate a head from a diaphragm.
Removing a case head, observe care not to damage the diaphragm which stuck to flanges of a head and the case of the pump. Further disassemble the drive mechanism for what previously vypressuyte axis 17 of the lever of the drive and remove the lever 15 and a spring 14. Carefully release a diaphragm 6 and remove it, a spring 5 and a sealant 3 with a washer 4.
Sorting a head, remove inlet 7 and delivery valves. For this purpose vypressuyte holders of valves.
After dismantling wash out all details in kerosene or unleaded gasoline, an obduyta compressed air, you pro-dry and check them.

Fig. 95. Device for assembly of a diaphragm of the fuel pump: 1 – case; 2 – adjusting pin; 3 – pump diaphragm; 4 – key;
5 – handle; 6 – handle axis


The diaphragm has to be tight, its varnish covering should not have peelings. At need its collecting-ku you make replacements of petals of a diaphragm on special adaptation (fig. 95).
Diaphragm spring height in a free state has to be 50–55 mm, and under load (5±0,2) kgfs – 15 mm.
Valves should not have korobleny, cracks, dents and visible wear tracks. Springs of valves have to densely, without gaps to press valves to saddles.
Levers of the drive of the pump and their axis should not have big wear. The maximum gaps between an axis of levers and its plug, and also between the plug and levers have to be no more than 0,25 mm.

Fig. 96. Lever of the drive of the fuel pump


Special attention should be paid on wear of working surfaces of the lever (fig. 96) in places of their contact. Before assembly check prileganiye flanges of a head and the case of the pump. The deviation from planeness has to be no more than 0,08 mm. At need carry out grinding in.
Always replace laying of the pump new and before installation grease with a thin layer of lubricant.
You carry out assembly of the pump in an order, the return to dismantling.

Fig. 97. The provision of a head of the fuel pump at its installation


At installation of a head of the pump its situation concerning the case has to correspond to fig. 97. Tighten screws of fastening of a head at the diaphragm delayed in extreme lower situation by means of the lever of manual pumping.
Such assembly provides necessary sagging of a diaphragm and unloads it from the excessive stretching efforts leading to sharp reduction of durability of a diaphragm. After assembly check the pump for working capacity.
With a frequency of rotation of a distributive shaft of 120 min.-1 and with a height of absorption of 400 mm the pump has to provide the beginning of supply of fuel not later than through 22 from later inclusion, to create pressure of 150-210 mm rt. Art. and depression not less than 350 mm rt. St. Pressure and depression created by the pump have to remain in the specified limits at the switched-off drive during 10 pages.
Giving of the pump with a frequency of rotation of a distributive shaft of 1800 min.-1 has to be not less than 120 l/h. At lack of the special device for check of the pump it can be checked directly on the engine as it is described in the subsection "Maintenance".

Repair of the carburetor
Repair the carburetor in case of breakage of its any details or during the unsatisfactory operation of the carburetor after adjustment on all modes of operation of the engine.
Before dismantling wash up karbyu-rator kerosene for removal of dust and dirt. During the work on ethylated gasoline previously keep the carburetor in kerosene during 10–
20 min.

Order of dismantling and assembly of the K-151L carburetor
 Dismantling of the carburetor
You carry out dismantling of the carburetor in the following sequence:
1. Take out the forelock and disconnect draft of the air gate from the lever.

Fig. 98. K-151L 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 a case; 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 – EPHH valve; 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 frequency of rotation 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


2. Unscrew seven screws 2 (fig. 98) of fastening of a cover of the carburetor, carefully uncover 4 carburetors and laying under it.
3. Disassemble the diaphragm device of the pneumoproofreader, for this purpose unscrew three screws 11, uncover 9, laying 8, a diaphragm of the 7th pneumoproofreader with draft assembled and a spring 10.
4. Unscrew the screw and remove a spray 42 of the accelerating pump.
5. Unscrew the adjusting screw 43 restart-up of fuel, turn the case 15 of the float-operated camera before drop-out of a ball of the 13th inlet valve.
6. Unscrew the screw displacer 12.
7. Turn off a cylindrical stopper and take out a float axis, remove a float and take out the fuel valve. Turn out a saddle of the fuel valve together with laying.
8. Turn off a toplivoprovodyashchy bolt 20, remove the union 16 of a toplivopodvod and the fuel filter 18.
9. Unscrew four screws 47 of fastening of a cover of the accelerating pump, uncover 22, laying 46, a diaphragm of the 45th accelerating pump assembled and a spring 44.
10. Turn off removable jets, pull out emulsion tubes.
11. Unscrew two screws 29 and disconnect the case of 26 mixing cameras from the case 15 of the float-operated camera, trying not to damage cardboard 40 and textolite the 39th laying.
12. Unscrew two screws of fastening of the valve 31 EPHH assembled and remove the last from the case of mixing cameras.
13. Unscrew two screws of fastening of a cover of the EPHH valve, uncover 36, cardboard laying 35 and the case 34 of the EPHH valve.
14. Turn off a clamp 53, bring out of gearing draft 52 with the lever 55 and remove the lever.
15. Unscrew two screws 57, uncover 58, the valve 59, laying 61 and a spring 60.
 Control and survey of details
All details have to be pure, without deposit and resinous deposits. Jets after washing and a purge with compressed air have to have the set capacity. All valves have to be tight, laying whole, with traces (prints) of the condensed planes. Diaphragms of the accelerating pump, the pneumoproofreader and the EPHH valve have to be whole, without damages. Replace the faulty or damaged details new.
 Assembly of the carburetor
The carburetor should be assembled in the sequence, the return dismantling. At first it is necessary to podsobrat all case details of the carburetor – a cover, cases float-operated and mixing cameras, and then to connect them among themselves.
At assembly:
1. You watch safety and the correct installation of laying.
2. You watch that throttle and air gates turned freely, without jammings and densely covered the channels.
3. Tighten all threaded connections densely, but without excessive efforts.
4. Make sure that the fuel valve freely slides in the saddle, without distortions and jammings.
5. Check and if necessary adjust fuel level in the float-operated camera, at the same time the float has to rotate freely on the axis, without touching camera walls.
6. "Acquire" screws 47 of fastening of a cover of the accelerating pump, press the lever 23 drives against the stop, wrap screws and release the lever.
7. "Acquire" two screws of fastening of a cover of the 36th EPHH valve, delay a locking element 33 of the EPHH valve on the size of 13,5-0,5 mm from the plane A (see the "EPHH valve" hub in fig. 98), wrap the mentioned screws, tighten two screws the valve of 31 economizers assembled to the case of mixing cameras.
8. Do not mix in places jets.
9. Check a gap between a wall of the mixing camera and an edge of a butterfly valve at completely open butterfly valve of primary camera. The minimum gap has to be 14,5 mm. If necessary provide a gap with a lever emphasis podgibaniye.