The carburetor is used to mix fuel with air and then deliver the resulting mixture to the car engine, where it, when burned, creates pressure on the valves of the engine block. The resulting force makes the car move, pick up and slow down
Carburettors are still used on older cars, trucks, small planes, and motor boats.
The carburetor is a mechanism that does not require special maintenance and everyday care, but it needs good tuning and adjustment. After that, all parts should work optimally. This will favorably affect the operation of the car engine.
Your car will have a smooth running engine if you learn how to properly adjust the carburetor. It is the first to be checked if there are any problems with the engine.
To better understand the intricacies of tuning and adjustment, let's find out what a carburetor is. This is a mechanism that is an element of an internal combustion engine, consisting of a diffuser, a throttle valve, a jet and a float chamber.
The work of the carburetor is based on such a physical phenomenon, which is called the Bernoulli principle, the Venturi effect, known to many in the school physics program. The principle states that the speed of air and liquid in a narrow tube increases, and the pressure on its walls decreases. The amount of air supplied to the engine is regulated by the throttle, and it is controlled by the accelerator pedal.
The main problems in the operation of the carburetor
- Gasoline leak. If drips of gasoline are visible, check the float chamber, float. Check the fuel pressure, its optimal value is 4-7 psi. If the pressure readings are normal, then the problem is with the float chamber. It's better to replace it.
- Dirty candles. The appearance of soot with a smell on the candles indicates an excessive supply of fuel. It can be caused by a burnt valve or an unadjusted float. Problems need to be checked and fixed.
- The engine runs unstable at idle. The problem is not in the carburetor itself, but in the wire connecting the accelerator pedal to the carburetor. This is checked in this way, the wire must be disconnected from the carburetor and, with the engine running, move the throttle manually. Turnovers fall to the desired indicators, which means that the wire is faulty. If not, then the problem is in the carburetor. First of all, you need to clean it from dirt and corrosion.
Adjustment
When the quality screw is screwed all the way in, the restrictive plug may break. If necessary, replace the broken plug with a new one.
After correct adjustment, the idle system should guarantee the speed provided by the factory settings and instructions.
When adjusting the idle system and shaft speed, you must fully comply with all the requirements written in the vehicle's operating instructions. If these standards are not observed, this can lead to engine malfunctions. Subsequent repairs will require large financial investments.
If you do not have sufficient experience in performing work of this kind, then for the first time do this procedure with an experienced specialist, especially if the engine has an OZONE carburetor. The specialist will help you to correctly adjust the CO content in the exhaust gases within acceptable limits.
If you encounter problems in setting up, you need to carefully turn the screw that regulates the quality of the mixture. With the same screw, set the optimal speed, as in the previous setting.
Video
Useful video about cleaning and tuning the carburetor:
The content of the article:
Communities › Japanese Carburettors › Blog › 2. Aisan Type K Carburettor Overhaul. Cause of engine tripping, choke adjustment, Toyota carburetor cleaning.
About the logo. The Toyota logo is a triple oval. The two inner ovals, arranged perpendicularly, symbolize the strong relationship between the client and the company. In addition, if you look closely and turn on your imagination a little, then in these ovals you can see the image of all six letters of the brand name T, O, Y, O, T, A.
Toyota Corolla / All about Toyota Corolla > Repair and Maintenance > Repair and Maintenance > Engine and gearbox bonie can you send me manuals for setting up this carburetor? Vacuum diagrams and exploded photos.
ADJUSTMENTS, carburetor mounted on engine 1. SEALING. A protective cap is installed on the mixture quality screw to prevent unskilled adjustment changes.
Here is a picture of the disassembled V-type, there is also a lot of interesting tuning somewhere. Who is at the conference now. Service maintenance and operation. The reason for a significant increase in resistance may be the deterioration of the conductive properties of the contact connecting the spring to the "-". Now I'm trying to get a collector and a native carburetor, and no more experiments with basins:
Prevention and tuning of the Aisan carburetor
Most likely I could, but there is nowhere, and it's cold outside: - To adjust, you need a gas analyzer, and you will have to look for a service where it is also available. I adjusted by eye. Remember, like Zhvanetsky? With a certain skill and the presence of a tool, it is cut from cardboard. I have a warped and half-dead carb. I removed the cold start system to hell except for the piston, it's hard to understand it. The process is as follows: hook the foot from the axis of the air damper with a spiral so that it is behind it, i.e.
A man wants to keep his journal, that's what; Look on the internet for a carb diagram for clarity. Now what to look for when stretching your crooked handles to this device. Laying - it would be better with her very gently.
Needed to automatically open and close the air damper.
Toyota Corolla e100, ICE repair, Carburetor adjustment, etc.
Carburetors for loaders
It is desirable to entrust the repair of the carburetor, its maintenance, installation of a repair kit, flushing, adjustment to a specialist with extensive experience in working with fuel systems of a loader. A clear understanding of the purpose and operation of each loader carburetor system is essential. Then and only then you can count on the productive and uninterrupted operation of loaders in the future.
Nissan, Komatsu, Mitsubishi, TCM forklifts were equipped with single-chamber Nikki carburetors with an automatic idle system.
The Aisan carburetor is also used on Toyota loaders with an automatic cold start and warm-up. The four-ton Toyota loader with a six-cylinder 7FG40 engine has a two-barrel Aisan brand carburetor with a semi-automatic cold start.
Early Toyota loaders were equipped with manual cold start carburetors.
Manual cold start carburetors were also used on early models of Mitsubishi, DAEWOO, Caterpillar.
Loader Toyota, engine 4Y, 5K - equipment - Aisan carburetor, single chamber.
The cold start system is automatic, equipped with a throttle damper, has an idle solenoid valve, which often fails. At the same time, in order to achieve the operation of the idle system, the valve shut-off needle is bitten off. As a consequence, there is then a “Glow ignition” after the ignition is switched off.
The set of possible malfunctions is approximately the same, in addition, the following happens:
1) Blockage under the diaphragm of the accelerator pump (very often) - as a result, a deep failure, lack of power when pressing the gas.
2) No idling - the channel in the area of \u200b\u200bthe solenoid valve seat is tightly clogged - it happens very often, based on practice.
3) The most common malfunction is wear or breakage due to careless handling of the plastic gear on the cold start automation unit. If this part of the carburetor is damaged, the loader will not start.
4) Wear of the mounting holes in the area of \u200b\u200bthe throttle valve axis. As a result - uneven idle due to air leaks. It is elementarily eliminated by replacing the throttle block (always available).
5) The failure of the control thermoelement is rare, it is not included in the repair kit, but it is always available.
6) The Toyota loader carburetor overflows quite often, while the needle valve must be assembled, the original one is available.
The tutor is faulty (it is also a speed controller, speed limiter):
Repair or replacement of the tutor is required.
Before adjusting the carburetor and even more so repairing the carburetor of a Toyota loader, it is necessary to check the condition of the engine.
Loader engine diagnostics includes:
valve clearances.
Condition of high-voltage wires, distributor cap and spark plugs.
The state of the ignition distributor (distributor)
Measurement of compression in cylinders.
Air filter condition.
Checking the level and viscosity of engine oil.
Cylinder air leak test to check the condition of piston rings, valves and cylinder head gaskets.
Only after that you can start tuning, adjusting the carburetor or repairing the carburetor of the loader.
It is also recommended that before removing the carburetor, check the governor (it is also a limiter, speed controller, mixer) - the unit on which the carburetor of the loader Toyota, Nissan, Komatsu, Mitsubishi, TCM, Daewoo, Sumitomo, Caterpillar, Hyster, Yale and others is installed.
Malfunctions of Toyota 4y, 5k loader carburetors:
1) Failure during the transition from idle to medium loads (incorrect idle settings or blockage of the idle channel)
2) Unstable idling (idle floats, revs fluctuate, idling disappears)
3) Spent when you press the gas.
4) Stalls when you press the gas.
5) It stalls when "gapz to the floor."
6) Interruptions in the operation of the engine during degassing.
7) Loss of power at "gas to the floor".
8) White, blue, gray exhaust smoke: has nothing to do with the operation of the carburetor.
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1 Toyota Aisan carburetor, type "K"
3 16.1 Internal fuel and air ducts 1. Needle valve seat 9. Internal ventilation duct 17. Throttle valve - primary 2. Enrichment float chamber valve plunger - leading to the secondary chamber of the device 18. Throttle valve - secondary 3. Fuel jet of the cooling system 10. Atomizer - secondary chamber of the downstream chamber - primary chamber 11 Weight of the pump outlet valve - 19. Throttle valve diaphragm 4. Diaphragm for opening the air accelerator - secondary chamber of the elephant 12 Piston of the accelerator pump 20. Main fuel jet - secondary - 5. Atomizer - primary chamber 13 Float chamber 6. Internal ventilation duct 14. Main fuel jet - port A Float chamber inlet manifold - leading to primary chamber B To adjust the toxicity of the primary chamber 15. Shut-off valve pov 7. Air damper 16. Adjustment screw 8. Accelerator pump injector 1. Principles of operation The following technical description of Aisan type "K" carburetors should be read in conjunction with a more detailed description of the principles of operation of carburetors in Chapter 1. Design The Aisan type "K" carburetor found on Toyota vehicles is vertical two-chamber carburetor with sequential opening of throttles. The drive of the throttle valve of the secondary chamber is vacuum. The air damper drive is mechanical or semi-automatic. The carburetor consists of three main components. These are the carburetor cover, carburetor body and throttle body (which houses the throttle bodies). An insulating block located between the carburetor body and throttle body serves to protect the carburetor body from excessive heat transfer. Metering System Fuel enters the carburetor by passing through a fine mesh filter. The fuel level in the float chamber is controlled by a needle valve or a plastic float. For ventilation, an internal ventilation duct is used, which extends to the area behind the air filter. Idle system and transient system The fuel from the fuel well flows through the calibrated idle jet into the idle channel. Here, the fuel is mixed with a small amount of air entering through a calibrated air jet. The resulting mixture passes through the port and exits the primary throttle port A conical mixture adjusting screw is used to change the orifice of the port, allowing fine adjustment of the idle mixture amount Multiple transient ports (or transient slot) provide a rich mixture when they open when the throttle is opened. This system ensures that there are no failures in the operation of the engine at the time of opening the throttle. The idle speed of the engine is controlled by the adjusting screw. The adjusting screw is screwed so that the toxicity of the exhaust gases is in line with the norm, and is closed with a cap.
4 Fuel cut-off valve The fuel cut-off valve is used to prevent fuel from entering the engine after the engine is turned off The valve has a 12 volt operating voltage and uses a plunger to block the idle passage when the ignition is turned off Idle air temperature compensator when the engine temperature is high Idle air temperature compensator when the engine temperature is high, it is a temperature-sensitive device that is installed between the air filter intake pipe and the intake manifold. It serves to prevent poor engine operation when the engine is hot (when the engine is idling for a long time in hot weather, for example) When the temperature in the engine compartment becomes too high, the fuel in the float chamber expands and the level rises, resulting in an overly saturated mixture The temperature compensator is used to supply additional air to avoid a supersaturated mixture The compensator is closed at normal temperature in the engine compartment When the temperature in the engine compartment rises above a certain level, a bimetal valve opens a channel from behind the air filter to the intake manifold Additional air enters the intake manifold to dilute the rich fuel mixture When the temperature in the engine compartment returns to normal, the valve closes, cutting off the air supply Throttle damper - some models When the throttle damper closes abruptly, there is a sharp increase in vacuum in the intake manifold, this can lead to the evaporation of fuel droplets located on the walls of the intake manifold This additional fuel often passes through the engine cylinders without burning to the end, which leads to an increase in the content of unburned hydrocarbons in the exhaust gases models with an automatic transmission or emission control system, a sharp lean mixture of fuel mixture can cause poor engine response or the engine may stall altogether. disrupting engine operation Accelerator pump The accelerator pump is controlled by a piston The accelerator pump control drive is mechanical and is carried out using a lever connected to the primary chamber throttle control mechanism When the accelerator pedal is pressed, the lever connected to the throttle valve coupling mechanism presses on the pump piston - accelerator The fuel from the pump chamber is forced into the pump outlets through the exhaust (weight) valve and enters the diffuser through the pump nozzle The inlet (ball) valve remains closed to prevent fuel from entering the float chamber When the accelerator pedal is released, the spring returns the piston to initial position Vacuum draws a new portion of fuel from the float chamber into the pump chamber through the outlet (ball) valve Main metering system The amount of fuel released into the air stream is controlled by a calibrated main fuel jet lowered into the fuel in the float chamber The emulsion tube, closed by an air jet, is installed in the well The fuel is mixed with air entering through the air jet and through the holes in the emulsion tube, the resulting emulsified mixture is discharged through the atomizer into a small diffuser Enrichment of the fuel mixture when the engine is not fully loaded Air channel goes from the throttle space to the enrichment chamber When the engine is idling and with a small throttle opening, the vacuum from the intake manifold in the channel takes the plunger away from the fuel mixture enrichment valve The valve closes, closing the fuel outlet channel When the engine speed increases, when the throttle valve opens more , the vacuum in the intake manifold decreases The plunger returns to its original position under spring pressure and presses on the valve, which opens the fuel channel Fuel from the float chamber through the channel enters the main fuel well of the primary chamber, the fuel level in the well rises, which leads to the formation of a more saturated fuel mixture Carburetor Secondary Chamber Operation There is an air duct in both the primary and secondary carburetor mixing chambers The air flows from these ducts flow into a single common duct that leads to a diaphragm that controls the secondary chamber throttle position At low engine speeds, only the primary mixing chamber is engaged When air flow speed
5 Choke damper opening After starting the engine, the choke should open slightly to create a less saturated fuel mixture and prevent fuel overflow Intake manifold vacuum acts on the diaphragm / diaphragm connecting mechanism opens the choke damper located in the air intake duct The system is reset by slowly depressing the accelerator pedal once or twice After starting the engine, power is supplied to the ceramic heater, which quickly heats up; The fast idle mode is activated by a toothed cam connected to the choke shaft The adjusting screw mounted on the throttle lever rests against the toothed cam and can be used to adjust the speed of the crankshaft at fast idle When the bimetal coil heats up and the air damper opens, the lever turns and the adjusting screw moves down over the teeth of the cam In this way, the idle speed gradually decreases until the fast idle cam is free and the idle speed decreases to normal Opening the choke After starting the engine, the choke should open slightly creating a less saturated fuel mixture and preventing fuel overflow when the engine is idling and at a weak throttle This is achieved by using intake manifold vacuum that acts on the diaphragm, the diaphragm coupling mechanism opens the air damper Fast idle system safety mechanism - installed on Some models The fast idle system safety mechanism is used to prevent too high engine speed when the engine is idling with the throttle closed. This can happen when the engine is warm. If the accelerator pedal has not been pressed for a long time, the fast idle lever will not rest on the bottom prong of the fast idle cam, causing the idle speed to remain elevated (rapidly depressing the accelerator pedal while the engine is warming up will slow the engine down if necessary) The safety diaphragm is activated by vacuum from the intake manifold, passing through the thermal vacuum valve When the coolant temperature is below 15 C, the thermal vacuum valve is closed and the diaphragm is not activated When the coolant temperature rises above 15 C, the thermal vacuum valve opens and vacuum is applied to the diaphragm A rod connected to the diaphragm acts on the fast idle lever, causing it to sink onto the bottom tooth of the high speed cam and the engine speed decreases, remaining approximately 400 rpm higher than normal idle speed. Partial choke opening at full throttle If the throttle is fully opened when the engine temperature is low, the vacuum at the diaphragm during Aisan carburetor identification - symbol (indicated by an arrow) and the choke float chamber window will disappear, causing the choke to close This can cause overfilling To prevent this, a partial choke mechanism is used. When the throttle is fully opened, the throttle lever moves down to open the choke slightly. have the original shape of the float chamber window (See figure) The manufacturer's identification code can be indicated on a metal plate attached to the carburetor with the carburetor cover fixing screw. Additionally, the carburetor production date code can be printed on the edge of the carburetor body wall. Date representation is in the following form - year (last digit of the year), then month (letter designation) and day of manufacture The month is represented by a letter as shown in the list below A B C D E F G H I J K L January February March April May June July August September October November December If, for example, the code "9 H 25" is marked, then the production date of this carburetor is August 25, 1989. Further identification of the carburetor can be made by comparing the carburetor with the figures shown. 3. Carburetor Maintenance - General Description In addition to this Chapter, read the "Carburetor General Description, Adjustments and Troubleshooting" chapter, which describes some operations in more detail. This Chapter assumes that in order to carry out a technical
6 16.3 Aisan carburetor components - with mechanical choke 1 Accelerator pump lever 17 Small diffuser - primary 29 Main fuel jet plugs - 2 Connecting rod of the choke opening gauge mechanism 18 Small diffuser - secondary 30 Shut-off valve 3 Air damper measures 31 O-ring 4 Air damper axis 19 Gasket - small diffuser lane 32 Seal 5 Throttle damper of the secondary chamber 33 Throttle valve diaphragm - 6 Fuel intake pipe 20 Gasket - small diffuser of the secondary chamber 7 Carburetor cover of the rear chamber 34 Carburetor body 8 Connecting accelerator pump rod 21 Accelerator pump piston 35 Main fuel jet - secondary 22 Fuel jet of cold chamber system 9 Diaphragm for opening air stagnant stroke - primary chamber 36 Seal - plugs of the main tolonka 23 Weight of the outlet valve of the pump - fuel jet of the secondary chamber 10 Accelerator mechanism connecting rod 37 Idle air mixture adjusting screw 24 Wash valve plunger 11 Washer float 38 Throttle lever 12 Needle valve seal 25 Float chamber gasket 39 Isolation block 13 Fuel intake pipe seal 26 Washer valve 40 Housing fuel chokes 27 Main fuel jet - primary 41 Hollow bolt 14 Needle valve seat and chambers Elements marked with a black rhombus - 15 Needle valve 28 Seal - main current plugs are included in the repair kit and 16 Primary chamber fuel jet float shaft must be replaced every time when rebuilding a carburetor
16.4 Aisan Carburettor Cover Parts - Semi-Automatic Choke Model 1. Accelerator pump lever 13. Carburettor cover 24. Mechanism connecting rod 2. Throttle damper 14. Bimetal choke opening coil 3. Throttle damper (other) 25. Needle valve seat] 16 Spring 26 Needle valve 4 Accelerator pump connecting rod 17. Enrichment valve plunger 27. Float 5 6. Fast idle system cable clamp 7. Idle accelerator pump seals 30. Float chamber gasket 8. Enrichment device plug 19 System safety mechanism included in the repair kit and 10. Seal - intake pipe - 20. The bracket must be replaced when rebuilding the carbuppiva. 11. Fuel intake pipe 22 Identification plate 3
8 Maintenance The carburetor is removed from the vehicle However, many operations can be carried out without removing the carburetor In this case, remove the carburetor cap and remove the fuel from the float chamber using clean wipes or a soft cloth Toyota recommends using a set of carburetor repair wrenches when disassembling and assembling carburetors, installed on Toyota vehicles The set of wrenches has identification number SST Disassembly and inspection 1 Remove the carburetor from the engine (Refer to the relevant chapter for details on the removal of the carburetor) 2 Inspect the carburetor for damage or wear (Refer to the relevant chapter) 3 Carefully mark the location of all vacuum hoses for their correct installation when assembling the carburetor Disconnect all vacuum hoses and check their condition 4 Disconnect the fast idle system connecting rod and remove the return spring 5 Unscrew the fastening screw of the accelerator pump lever and remove the lever 6 Unscrew the fastening screws and remove the carburetor cover If the cover does not come off tap on it with a rubber mallet Do not try to pry the carburetor cover off with a screwdriver, as you may damage the mating surfaces 7 Inspect the float chamber for corrosion and traces of calcium deposits 8 Knock out the float shaft and remove the float needle valve and needle valve seat, fuel filter and float chamber gasket 9 Using a ruler, check for warped flanges of the carburetor cap and carb body 10 Check the tip of the needle valve for signs of wear or nicks 11 Check the float for damage and the ingress of gasoline, the ingress of fuel into the float can be checked if you shake the float Or, lower the float into the water and check for air bubbles Replace the float if it is broken 12 Check the float arm bracket for deformation and check the float shaft mounting holes for signs of wear or damage 13 Replace float shaft if worn 14 Inspect the fuel filter and replace it if necessary 1 5 Remove the fuel cutoff valve and clean it with a carburetor cleaner The operation for checking the valve is described in the "Checking the Carburetor Components" section of this Chapter 16 Remove the mixture adjustment screw and remove the spring Inspect the tip of the screw for damage or nicks. 18 Remove the accelerator inlet valve spring, mounting clip and ball, turn the carburetor over and shake out these items in the palm of your hand 19 Remove the accelerator pump outlet valve spring, weight and ball, turn the carburetor over and shake out these items in the palm of your hand 20 Mark the diameters of the primary and secondary jets chambers and the position of their installation for the correct installation of these elements when assembling the carburetor When installing the jets of the primary and secondary chambers, it is easy to confuse 16. 5 Setting marks of the semi-automatic choke mechanism bimetal coil cover 21 Remove the fuel jet of the primary idling system 22 Unscrew the main fuel jets of the primary and secondary chambers Access to the jets of the main metering system can be gained after removing the plugs located under the float chamber so as not to damage the jets 23 Check that the holes of all jets are not worn, clogged or out of round shape Check that the channels connecting the float chamber to the wells of the emulsion tubes are clean 24 Unscrew and remove the enrichment device valve from the float chamber and check its operation? Check the operation of the enrichment valve plunger installed in the carburettor cap 26 Loosen the mounting screw and remove the enrichment valve plunger from the carburettor cap 27 Loosen the mounting screws and remove the small primary and secondary chamber diffusers and the emulsion tubes from the large diffusers 28 Check the throttle damper and safety device diaphragm fast idle system following the instructions given in Section "Inspection of Carburettor Elements" 29 Check the choke opening diaphragm using the instructions given in the following Section 30 Disconnect the secondary throttle valve stem by removing the mounting clip Loosen the mounting screws and remove the diaphragm from the carburetor body 31 Unscrew fixing bolts (lower and upper) and remove the carburetor body from the throttle body Note the installation position of the insulating block One bottom bolt is hollow and serves as an additional vacuum channel - note its installation position 32 Using a ruler, check for deformation on the mating surfaces 33 If necessary, unscrew the fastening screws and remove the casing of the bimetallic coil from the casing of the air damper, noting the position of the setting marks 34 Check the air damper mechanism for signs of wear and ease of movement, treat the jamming elements of the mechanism with an appropriate aerosol. If the mechanism continues to get stuck, replace them Fluid is leaking from the outlets Flush all carburetor passages with carburetor cleaner to help remove dirt and sediment To clean internal carburetor passages
9 16.6 Disconnect and plug the idle air temperature compensator vacuum hose at high engine temperature (1 - temperature compensator) 16.7 Idle system adjustment screws 1 Idle speed adjustment screw 2 Idle mixture adjustment screw 3 Tool for turning the adjustment screw idle mixture 16.8 Check the fuel level in the float chamber After a short engine run, compressed air can be used, but only when the carburetor is completely disassembled solution may splash in your face] Reassembly When reassembling the carburetor, all gaskets must be replaced Also replace the needle valve and accelerator pump piston Inspect and (if necessary) replace the burner shaft, mixture adjustment screw, fuel and air jets and emulsion tubes Replace worn connecting elements mechanisms screws, springs and other worn parts Check that all jets are securely screwed into their sockets (but do not tighten them too much) A loose jet can lead to a too rich (or even lean) fuel mixture Clean the mating surfaces and cover flanges carburetor and throttle body traces of the old gasket and replace the cover with a new gasket Do not use sealant on the flanges or mating surfaces of the carburetor elements, or when installing the carburetor on the engine If the sealant gets into the channels passing through the carburetor, the carburetor may fail Check so that the fuel and air passages of the halves of the carburetor are correctly aligned 1 Reinstall the bimetal housing (if it was removed) and check that the spring is in place. Checking the height of the float 1 Measuring tool H loosely tighten the three fixing screws Align the marks on the bimetal housing and the carburetor cover, then tighten the fixing screws securely. 2 Assemble the carburetor body and throttle body with a new gasket between them Secure the assemblies with the mounting bolts Check that the vacuum port bolt is installed correctly 3 Install the secondary throttle diaphragm and secure it with the mounting screws Install the mounting clip on the diaphragm rod 4 Install small primary and secondary chamber diffusers and emulsion tubes into large diffusers and secure them with machine screws (be careful not to confuse the components of the primary and secondary chambers) 5 Install the enrichment valve plug into the carburettor cap and secure it with machine screws 6 Screw the enrichment valve into the float chamber 7 Screw the jets of the main metering system into their sockets (do not mix up the jets), and install the sealing plugs 3 Install the fuel jet of the idling system of the primary chamber. 9 Install the accelerator pump outlet valve ball, weight and spring 10. Install the accelerator pump inlet valve ball, mounting clip and spring
10 11. Install the accelerator piston with seals in the carburettor cover; replace seals if necessary. 12. Install the idle mixture adjustment screw and spring. Gently turn the screw all the way in (using the special tool if necessary), then back it out three full turns to provide the initial adjustment to start the engine. Note: The threads in the carburetor hole are very thin, so you need to be very careful not to turn the screw out of alignment. If you damage the threads, the throttle body will need to be replaced. 13. Install check valve with new sealing washer and o-ring. 14. Clean or replace the fuel filter and install it in the needle valve seat. 15. Install the needle valve with a new sealing washer. Check that the valve is securely installed (but not too tight). Reinstall the float and float pin. 16. Adjust the float height using the instructions in the next Section. 17. Install a new float chamber gasket to the carburetor body. Note: Since there are many modifications to Aisan carburetors, it is important to carefully compare the old and new gaskets. A slight difference between the gaskets can cause one of the fuel or air passages to be blocked - resulting in poor engine performance. 18. Install the carburetor cover on the carburetor body and secure it with the machine screws. Tighten the screws gradually and in turn so as not to deform the surface of the body or carburetor cover. 19. Connect the lever of the accelerator pump and tighten the fixing screw. 20. Install the fast idle connecting rod and spring. 21. Check the smoothness and translation of the movement of the air damper and the connecting mechanism. Check that the coupling mechanism moves easily and is not worn. 22. Connect vacuum hoses, using the marks made before removal. 23. Install the carburetor to the engine (Refer to the relevant chapter for a detailed description of the carburetor installation procedure). 24. Always check the adjustment of the speed of the crankshaft when the engine is idling and the amount of fuel mixture idling - preferably using a CO sensor - after any work on the carburetor. Adjustment operations are described in the next Section. If the carburetor is completely disassembled, be sure to check all adjustments! Float height adjustment A Float tongue 4. Carburetor adjustment during maintenance Conditions for adjustment Conditions for correct adjustment of the carburetor are described in the appropriate chapter. 1. Disconnect the vacuum hose from the hot idle air compensator (if equipped) and plug the fitting on the carburetor (See illustration). Adjusting the idle speed of the engine and the amount of fuel mixture idling (CO) Note: A special tool (part N SST O020) must be used to turn the adjusting screw. Most of the tools needed to repair Japanese carburetors are made by Sykes-Pickavant. 2. Increase the engine speed to 3000 rpm and hold it at this level for 30 seconds to clear the intake manifold of fuel vapors, then leave the engine to idle. 3. By means of the screw of adjustment of speed of idling, adjust frequency of rotation of a cranked shaft at idling of the engine (See the section of technical characteristics at the beginning of this Chapter). 4. Check CO level; if it differs from that specified in the specifications section, remove the seal and adjust the idle mixture screw to obtain the correct CO level. Turning the screw clockwise (tightening) decreases the CO level, turning the screw counterclockwise (twisting it) increases the CO level. If you do not have a CO sensor, the operation of adjusting the idle mixture without using a CO sensor is described in the appropriate chapter. Checking the stroke of the float 1. Measuring tool (you can use a set of feeler gauges or a drill instead)
11 16.13 Accelerator pump adjustment 1 Tie rod Fast idle adjustment - models with mechanical choke 1 Fast idle code adjustment screw Place the fast idle lever on the top third tooth of the fast idle cam - models with semi-automatic choke 5 Repeat the above operations until both adjustments are correct 6 Clean the intake manifold every 30 seconds while making an adjustment, increasing the engine speed to 3000 rpm for 30 seconds 7 Raise the engine speed to 2000 rpm and measure the CO level the value should be less than half the CO level when the engine is idling 8 Install a new seal on the mixture adjustment screw and connect the vacuum hose to the temperature compensator of the idle system when the engine temperature is high after adjustment. Setting the fuel level in the float chamber / adjusting the stroke of the float 9 The fuel level in the float chamber can be checked without removing the carburetor When the engine is running, the fuel level can be checked through the float chamber window If the fuel level does not match the mark (See figure), adjustment is necessary 10 Remove the carburetor cap following the instructions in Section 3 Turn the cap over 11 Measure the distance "H" (float setting height) between the carburetor cap and the plastic float (See figure) Check that the float setting height is as specified in the specification section at the beginning of this Chapters Note If the exact float height is not specified in the specification section, adjust the float height approximately assemble the carburetor and check the fuel level The adjustment operation must be repeated until the fuel level is correct 12 Adjust the float height by bending the float lever "A" [See figure) 13 Remove the pin from the needle valve and raise the float as far as the limit tab will allow 14 Measure the distance (float travel) between the tip of the needle valve and the float arm (See figure) (Use a feeler gauge set if you do not have a special 15 Adjust the float stroke by bending the stop tab "B" (See figure) 16 Install the pin on the needle valve when the adjustment is complete air to allow the diaphragm to fully retract the stem 18 Fully open the throttles and measure the stroke of the accelerator pump 19 Adjust the stroke by bending the connecting rod (See figure) The required stroke for the accelerator pump is shown in the specification section at the beginning of this Chapters Adjusting the air damper 20 Check compliance with the adjustment conditions described at the beginning of this Section It is especially important to check that the ignition timing is set correctly and the duration of the closed state of the breaker contacts Also check that the idle speed and the amount of idle mixture are correctly adjusted and the engine has been warmed up to normal operating temperature 21 Remove the air filter 22 Disconnect the crankcase ventilation hose The vacuum hoses must remain connected (or disconnect them and plug the holes) On Toyota vehicles, when checking and adjusting the fast idle mechanism and choke mechanism, the carburetor must be removed from the engine. throttles The required choke angles are given in the specifications section at the beginning of this chapter. If you do not have a special tool, using the following methods will give an acceptable
12 16.16 Disconnect and plug the hose of the fast idle system safety mechanism - models with semi-automatic choke 1 Disconnect Fast idle adjustment - models with semi-automatic choke 2 Fast idle system adjusting screw indicates the speed of the crankshaft at fast idling, adjustment must be carried out according to this value Fast idle adjustment - models with a mechanical choke 25 Slightly open the throttle and use the button on the instrument panel to completely close the choke 26 27 Adjust the choke opening by turning the adjusting screw (See figure] in the desired direction so that the speed of the crankshaft at fast idling is rpm Adjusting fast idling - models with automatic choke (with the engine running) 28 Open slightly throttle and place the fast idle lever on the top third prong of the fast idle cam (See illustration) 29 Disconnect and plug the internal vacuum hose to the fast idle safety device diaphragm (See illustration) 30 Start the engine without depressing the accelerator pedal, 31 Adjust the engine speed by turning the fast idle speed adjustment screw (See figure) in the desired direction 32 Connect the vacuum hose to the diaphragm of the safety mechanism after completing the adjustment Determination of the opening moment of the throttle position switch (Ohmmeter) Checking the opening of the choke 33 Checking must be started with a cold engine accelerator pedal once or twice If the vehicle is equipped with a mechanical choke, fully pull out the adjustment knob on the instrument panel to close the choke 35 Start the engine and check that the diaphragm opens the choke slightly 36 If the choke does not open, connect a vacuum pump to the choke opening diaphragm port and evacuate air to obtain a vacuum of 400 mmHg Diaphragm must be fully open choke and vacuum must be maintained for at least 30 seconds Replace the diaphragm if it is defective 37 If the engine stalls immediately after starting or runs very erratically try slightly open the choke with your finger If the engine starts to run better, try changing the choke opening setting so that the choke opens a larger angle semi-automatic choke only 39 Open the throttle fully and the choke should open slightly.
13 16.20 Throttle position switch adjustment 7 Adjusting screw 40 The choke position adjustment can be changed by bending the choke valve opening stop in the required direction 5. Checking the carburetor components Fuel cut-off valve To test the fuel cut-off valve, see the appropriate chapter Throttle position switch - some models 1 Warm up the engine to normal operating temperature and check the idle speed adjustment and the idle mixture adjustment switch and carburetor body (See figure) The ohmmeter should show infinite resistance 4 Start the engine and slowly increase the engine speed when the engine speed increases to 1400 rpm, the ohmmeter should show continuity 5 Adjust the switch by turning the adjusting screw (See illustration) in the desired direction 6 After adjustment, connect the connector to the switch. the radiator cooling fan must be off 8 With the engine idling, disconnect and plug the throttle damper hose (See illustration) 9 Open the throttle and raise the engine speed to about 3000 rpm Close the throttle quickly and check that the rod touched the throttle lever at 2000 ± 200 rpm 10 Adjust the throttle damper by turning the adjusting screw in the desired direction 11 Connect the hose to the throttle damper after adjustment operating temperature and check idle speed adjustment and idle fuel mixture adjustment Radiator cooling fan must be off when making adjustment 14 Open the throttle and raise the engine speed to about 3000 rpm Close the throttle quickly and check that the damper rod touches the throttle lever at 1200 rpm 1 5 Adjust the throttle damper by turning the adjusting screw in 16 Disconnect and plug throttle damper hose "B" 17 Open throttle and raise engine speed to approximately 3000 rpm Close throttle quickly and check that damper rod touches throttle lever at throttle 2000 ± 200 rpm 18 Connect both vacuum hoses to the throttle damper after adjustment is complete Fast idle system safety mechanism - semi-automatic choke models only 19 Warm up the engine to normal operating temperature and check the idle speed adjustment and 20 Stop the engine and close the choke 21 Open the throttle slightly and place the fast idle lever on the top tooth of the cam Throttle damper check - single diaphragm 1 Adjusting screw 2 Disconnect Throttle damper check - double diaphragm 1 Adjusting screw A Hose "A" B Hose "B"
14 16.23 Checking the fast idle safety device - disconnect hoses "A" and "B" 1. Disconnect 22. Disconnect the two vacuum hoses from the safety device (See figure) 23. With the engine idling, connect the vacuum hose to the diaphragm " A", the fast idle system lever should move down to the third tooth of the cam (See figure) 24. Connect the vacuum hose to diaphragm "B" and the fast idle system lever should move lower. 6. Connect 6. Troubleshooting Diagnosis of basic carburetor malfunctions is described in the corresponding chapter. The following faults are specific to Aisan carburetors Engine will not start when hot Faulty idle speed compensator at high engine temperature Excessive idle speed Throttle damper faulty. The temperature compensator of the idling system is faulty at a high engine temperature.
Honda Keihin Carburettors (Type 1) Accelerator Pump Nozzle Diameter Accelerator Pump Stroke (mm) 19.0 + 0.5 Float 1 Mounting Height 35.4 37.4 (mm) Float 2 Mounting Height (mm) Float Stroke
5.1.5. Check of elements of the carburettor HOT AIR SUPPLY SYSTEM Operations of check of system of giving of hot air are described in subsection 5.1.1. INTAKE MANIFOLD HEATER Heater System Diagram
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Gasoline engines 1JZ-GE, 2JZ-GE, 1JZ-GTE Checking and adjusting thermal clearances in valves Note: check and adjust thermal clearances in valves on a cold engine. 1. Disconnect
The K-125 carburetor is single-chamber with a falling stream and a horizontal air supply (Fig. 36). The float chamber is balanced and communicates with the atmosphere through an air pipe and an air filter. Rice.
4.2.1 Carburetor Scheme of the main dosing system of the carburettor and econostat The econostat is located in the secondary chamber of the carburettor. In the diagram, it is conditionally shown in the primary chamber. 1 econostat emulsion jet;
General description General description, adjustments and troubleshooting of the carburetor 1. Identification
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Page 1 3.2.12. Cylinder head GENERAL INFORMATION The sequence of tightening the cylinder head bolts
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AISAN carburetor. Model 26/30 and 28/32. User guide. This guide was written by me for the first time, so do not judge strictly. All the shortcomings of the material presented, please write to me by e-mail
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CONTENT CHAPTER. MANUAL. Nameplates.... Operating the vehicle.... Starting the engine.... Breaking in and maintaining a new vehicle.... Checking the vehicle.... General
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Model Model Years Engine Engine Number/Code Transmission Type Carburetor Install Date Carburetor Type Ident Number Model Years Engine Engine Number/Code Transmission Type Date
Xxx xxx 12345xxxxx Date 05.Jan.2014 Engine management System checks and adjustments Prerequisites The engine has reached normal operating temperature. The ignition system is in good condition.
CONTENT CHAPTER. MANUAL. Basic information.... Precautions and operation of the new bus.... Controls and instrumentation... 4. Maintenance...
Fan belt tension should be checked before each ride. Weak belt tension causes slippage, causing the engine to overheat and the battery to be undercharged. heavily stretched
UNIVERSAL FUEL KIT INSTRUCTIONS FOR INSTALLING THE UNIVERSAL FUEL KIT ON A GASOLINE ELECTRIC GENERATOR *The developer reserves the right to make changes or additions to the indicated
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Page Page 1 of 9 Removing and installing unit injectors Special tools and workshop equipment required Micrometer stand -VW 387- Attachment -3410- Attachment
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Engine 58 CHAPTER 1 ENGINE L3, LF, L8 engine - dismantling and dismantling Removal of components and assemblies without dismantling Location of components and assemblies that can be removed without dismantling 1. Belt 2. Tappet
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17-1 CHAPTER 17 ACCELERATOR ACTUATOR AND EMISSION CONTROL SYSTEMS CONTENTS ACCELERATOR ACTUATOR ............... 17-3 ADJUSTMENTS .................. 17-3
MINISTRY OF EDUCATION OF THE REPUBLIC OF BELARUS Establishment of Education "Gomel State University named after Francysk Skaryna" Department of forestry disciplines MECHANIZATION OF FORESTRY WORKS
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Cause of the malfunction Remedy The engine does not start or starts poorly, the ignition is working properly 1. Clogging or malfunction of the gasoline supply system to the carburetor. 1. Disconnect the inlet fitting
BLEEDING UNIT, models 10705 and 10805. DESCRIPTION This compressed air tool is designed to bleed brakes and clutches on all types of passenger cars. pumping
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Installation manual for retrofitting the 1.4l 55kW Golf 1.4l 55kW (AHW and AKQ) Manually Driven Crankcase Ventilation with Active Electrical Heating (PCV)
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The treasured set of letters of any carburetor damn ... AISAN.
The device is wildly phanar, the principle of operation is clear even to a child ... But when it comes to repairs ...
So, let's start sharing... To begin with, it's worth deciding what we want from the carb.
Eats a lot - float overflow, incorrectly tuned idling.
Do not start on a cold one without a gas pedal - problems with the accelerator pump and possibly a problem with the cold start system of the carb. To be more precise - an automatic air damper.
Do not start on a cold ... Nicherta does not help, only 50 grams of benzyl in the first chamber. - Accelerating + air + jets.
It does not stall immediately / does not stall / - the solenoid valve or jet is on it.
When you release the pedal, the speed does not drop to idle - most likely the accelerator cable.Now what to look for when stretching your crooked handles to this device. (Your arms are already straight after 2 dead carbs! :)
1. Remember - if you climbed yourself, there will be no way back!!! In Ussura, after crooked handles, carburetors do not look at cars. So if you took up the tug, don't say that it's not a lot.
2. When disassembling, the most dibile part is the piece of iron that goes from the throttle to the air damper. Broke on both carbs. Needed to automatically open and close the air damper .. In the event of a breakdown, big problems begin with starting on a cold one.
3. Gasket - it would be better to be very gentle with it. I broke it on the first one... I couldn't restore it... The second one is still alive.
4. Nowhere is it said, but if a metal ball fell out during disassembly - IT DID NOT JUST FALL OUT!!! HE'S WITH THE ACCELERATING PUMP!!! I lost my 2...If this message did not help you and you broke something, write ... I have a warped and half-dead carb. But wind up and consumption of about 10 in the country and 12 in the city (now). In the summer it was 8/10.
The XX adjustment is child's play. So this procedure is not described. I'll just say the following:
1. On 3E quantity and quality (two screws) on the back side of the carb (which is further from the hood and closer to the carrier).
2. On the 4th quality bolt at the back as on 3E, but there are two bolts on the passenger side.
The accelerator cable is located on the side of the carrier, the Bimetal spring is on the side of the carrier above the cable.
Solenoid valve at the back of the carb.The vacuum system is only needed for:
1. Opening of the secondary chamber during acceleration.
2. Opening the air damper during acceleration.
3. advance angle shift upon reaching the Nth number of revolutions.Does not affect consumption. It also does not affect the dynamics, movement and other characteristics. Maybe it will go a little worse, it will be more capricious, but it will work and will not eat benz. So we dig the vacuum system last - so that the devil will break his leg there !!!
