Prevention and adjustment of the Aisan carburetor
If the fuel level does not correspond to the mark, adjustment is necessary.
Toyota Corolla. Setting the idle speed.
Tuning means setting your idle speed and idle mixture. Fast idle system lever 3.
Toyota Corona 5AF-キャブレター › Logbook › Overkill Aisan Carburetor type K. Cause of engine tripping, adjustment…
Check for air leaks: The Toyota logo is a triple oval. If 2, then try to evaluate and compare the temperature of the cooling system hoses and compensator hoses.
Screw for adjusting the crankshaft speed when the engine is idling 2.
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The Toyota logo is a triple oval. Two internal ovals located perpendicularly symbolize the strong relationship between the client and the company. In addition, if you look closely and use your imagination a little, in these ovals you can see an image of all six letters of the brand name T, O, Y, O, T, A.
I don't have the green valve. In this case, all tubes are connected, except for the one that comes out next to the quality adjustment screw. It caught on when the throttle was fully opened, but would not start and ended up flooding the spark plugs.
To adjust the fast idle system, the carburetor must be removed from the engine. Turn the carburetor over and use the choke lever to close the choke completely.
The adjusting screw will open the throttle valve, creating a small gap. Using the shank of a drill, measure the gap between the wall of the carburetor chamber and the edge of the throttle valve, see Fig.
Checking the choke position when the engine is running at fast idle. Adjust the gap by bending the connecting rod at point 1.
Automatic choke The conditions for adjusting the automatic choke have been specified. Open the throttle slightly and install the fast idle lever on the upper tooth of the fast idle cam. Start the engine without pressing the accelerator pedal and note the engine speed at fast idle.
Compare the obtained frequency with the value specified in subsection 5. Adjust the crankshaft speed by rotating the fast idle speed adjustment screw in the required direction.
Fast Idle Adjustment for Semi-Automatic Choke Models - Carburetor Removed from Engine Fast Idle Adjustment 1. Fast Idle Cam 2.
Turn the carburetor over, then open the throttle slightly and position the fast idle lever on the second tooth of the fast idle cam. Check that the air damper is completely closed.
Using the shank of a drill, measure the size of the gap “G” between the wall of the carburetor chamber and the edge of the throttle valve, see. The treasured set of letters of any carburetor damn The device is wildly fanaric, the principle of operation is clear even to a child But when it comes to repairs First, we need to decide what we want from carba.
Toyota
Carburetors for loaders
It is advisable to entrust the repair of the carburetor, its maintenance, installation of the repair kit, flushing, and adjustment to a specialist who has extensive experience in working with forklift fuel systems. A clear understanding of the purpose and operating principle of each forklift carburetor system is necessary. Then and only then can you count on productive and uninterrupted operation of the loaders in the future.
Nissan, Komatsu, Mitsubishi, TSM forklifts were equipped with Nikki single-chamber carburetors with an automatic idle system.
Toyota loaders use an Aisan carburetor, also with automatic cold start and warm-up. The four-ton Toyota loader with a six-cylinder 7FG40 engine has a two-chamber Aisan carburetor with a semi-automatic cold start.
Early models of Toyota loaders were equipped with manual cold start carburetors.
Carburetors with manual cold start were also used on early models of Mitsubishi, DAEWOO, Caterpillar.
Toyota loader, engine 4Y, 5K – equipment – Aisan carburetor, single chamber.
The cold start system is automatic, equipped with a throttle damper, and has an idle speed 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 result, “Glow ignition” occurs after the ignition is turned off.
The set of possible faults is approximately the same, in addition to the following:
1) A 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 idle speed - the channel in the area of the solenoid valve seat is tightly clogged - this 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 automatic unit. If this part of the carburetor is damaged, the loader will not start.
4) Wear of the mounting holes in the area of the throttle valve axis. As a result, uneven idle due to air leaks. It can be easily eliminated by replacing the throttle unit (always available).
5) Failure of the control thermoelement is rare; it is not included in the repair kit, but is always available.
6) The carburetor of a Toyota loader is overfilled quite often, and the needle valve must be installed as an assembly; the original one is available.
The governor (also known as the speed controller, speed limiter) is faulty:
- The governor needs to be repaired or replaced.
Before adjusting the carburetor and especially repairing the carburetor of a Toyota loader, it is necessary to check the condition of the engine.
It is generally accepted that blue (gray) exhaust smoke indicates an engine malfunction, and black exhaust indicates a carburetor malfunction.
Loader engine diagnostics include:
- Valve clearances.
— Condition of high-voltage wires, distributor cap and spark plugs.
— Condition of the ignition distributor (distributor)
— Measurement of compression in cylinders.
— Condition of the air filter.
— Checking the level and viscosity of the engine oil.
— Test for air leaks from the cylinders to check the condition of the piston rings, valves and cylinder head gaskets.
Only after this can you begin tuning, adjusting the carburetor or repairing the carburetor of the loader.
It is also recommended that before removing the carburetor, check the governor (aka limiter, speed controller, mixer) - the block on which the carburetor of the Toyota, Nissan, Komatsu, Mitsubishi, TCM, Daewoo, Sumitomo, Caterpillar, Hyster, Yal 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 clogged idle channel)
2) Unstable idling (idles float, revs fluctuate, idle disappears)
3) Performed when pressing the gas.
4) Stalls when you press the gas.
5) Stalls when there is a gap to the floor.
6) Interruptions in engine operation during degassing.
7) Loss of power when “gas to floor”.
White, blue, gray exhaust smoke: has nothing to do with the operation of the carburetor.
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- Adjust the height of the float by bending the float lever “A”.
- Remove the pin from the needle valve and raise the float as far as the stop tab will allow.
- Measure the distance (float stroke) between the tip of the needle valve and the float arm (use a feeler gauge if you don't have the special tool). Compare the resulting value with the value indicated in the technical specifications section.
- Adjust the float stroke by bending the limiting tab “B”.
- Connect a vacuum pump to the throttle damper diaphragm and pump out air until the diaphragm completely retracts the rod.
- Fully open the throttles and measure the stroke of the accelerator pump piston rod.
- Adjust the stroke of the rod by bending the connecting rod (see figure). The required value for the accelerator pump piston rod stroke is indicated in the technical specifications section at the beginning of this Chapter.
Choke adjustment - general description
- Check that the adjustment conditions described at the beginning of this Section are met. It is especially important to check the correct setting of the ignition timing and the duration of the closed state of the breaker contacts. Also check that the idle speed and idle mixture are adjusted correctly and that the engine is warmed up to normal operating temperature.
- Remove the air filter.
- Disconnect the crankcase ventilation hose. The vacuum hoses must remain connected (or disconnect them and plug the holes).
- Methods for diagnosing faults that appear during a cold engine start and during warm-up are described in the corresponding chapter.
- On Toyota vehicles, when checking and adjusting the fast idle mechanism and the choke opening mechanism, the carburetor must be removed from the engine. The special angle tool (part number SST 09240-00014) is used to set the choke angle at fast idle and partial throttle at full throttle. The required choke opening angles are given in the technical specifications section at the beginning of this Chapter. If you do not have a special tool, using the following methods will give acceptable results. If the technical specifications section indicates the speed of the crankshaft at fast idle, the adjustment must be made based on this value.
Fast Idle Adjustment - Mechanical Choke Models
- Open the throttle slightly and use the button on the instrument panel to close the choke completely.
- Start the engine and open the choke fully.
- Adjust the opening of the air damper by rotating the adjusting screw (see figure) in the required direction so that the crankshaft speed at fast idle is 2000 - 3000 rpm.
- Fast idle code adjustment screw
Fast Idle Adjustment - Auto Choke Models (Engine Running)
- Open the throttle slightly and position the fast idle lever on the third upper tooth of the fast idle cam (see illustration).
Source
5.1.4 Carburetor adjustment
5.1.4. Carburetor adjustment
| GENERAL INFORMATION |
Adjustment Conditions
If your vehicle is equipped with a constant idle speed control system, you must turn off all vehicle electrical equipment and set the front wheels straight before adjusting the idle speed or fuel mixture (or before adjusting the ignition timing or the duration of the closed state of the breaker contacts). Otherwise, the stabilization system will be active and the adjustment will be incorrect.
Disconnect the vacuum hose from the high idle speed compensator (if equipped) and plug the fitting on the carburetor.
Adjusting the crankshaft speed when idling the engine and the amount of idle fuel mixture (CO)
Idle speed adjustment screws
| 1. Screw for adjusting the crankshaft speed when the engine is idling 2. Screw for adjusting the idle mixture |
| EXECUTION ORDER | ||||||||||||||||||||
| Setting the fuel level in the float chamber/adjusting the float stroke Float chamber window 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 sight glass. If the fuel level does not correspond to the mark, adjustment is necessary.
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