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Communities › Japanese Carburetors› Blog › 2. Overhauling the Aisan Type K Carburetor. Cause of engine tripping, adjustment air damper, cleaning the Toyota carburetor.

About the logo. 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.

Toyota Corolla / All about Toyota Corolla> Repair and Operation > Repair and Operation > Engine and gearbox bonie can you send me the manuals for setting up this carburetor? Vacuum diagrams and exploded view photos.

ADJUSTMENTS, carburetor installed on engine 1. SEALING. A protective cap is installed on the mixture quality screw to prevent unauthorized changes to the adjustment.

Here is a drawing of a disassembled V-type, there is also a lot of interesting information about the setup somewhere. Who's at the conference now? Service maintenance and exploitation. The reason for a significant increase in resistance may be a deterioration in the conductive properties of the contact connecting the spring to “-”. Now I’m trying to get a manifold and original carburetor, and no more experiments with cans:.

Prevention and adjustment of the Aisan carburetor

Most likely I could, but there’s nowhere, and it’s cold outside: - To adjust, you need a gas analyzer, and you’ll have to look for a service that has one. I set it up by eye. Remember how Zhvanetsky did? With some skill and the availability of tools, it is cut from cardboard. I have a mangled and half-dead carb. The cold start system has been removed to hell except for the pain, it’s difficult to understand it. The process is as follows: hook the tab from the axis of the air damper with a spiral so that it is behind it, i.e.

A person wants to keep his own journal, that’s what; Look on the Internet for a diagram of the carb for clarity. Now what to pay attention to when stretching your crooked hands to this device. The gasket - it would be better to be very gentle with it.

Needed for automatic opening and closing of the air damper..

Toyota Corolla E100, engine repair, Carburetor adjustment, etc.

Diagnostics and repair - engine 5A-F

15.09.2006

There are still many Corolla, Corona and similar “swallows” with engines running on our roads.5 A- F .

Often, when technicians open the hood and see a carburetor entangled in vacuum tubes, they refuse to repair it.

It is inconvenient to tinker with rods, small lock washers, and take a long time to deal with tangled vacuum tubes. Moreover, the drivers of such “rarities”, as a rule, are not particularly wealthy people. In general, this is not a very profitable business - “fussing with the carburetor.”

Meanwhile, there’s really nothing to fuss about.

The jets rarely clog there - thanks to good filters, air and gasoline.
The adjustments are all external.
Starting system, system idle move, increased speed...
We won't dwell on this.

Consider a closed-loop air supply system to the intake manifold.

Regulates air supplyEACVvalve located under the carburetor:

Photo 1

To this valve with ECM (on-board computer), pulses are supplied with a frequency of approximately 400Hz.

(The arrow in photo 1 indicates the location of the adjusting screw for increased idle speed when warming up. I usually set it to 1500-1700rpm.).

If the signal from the oxygen sensor is low, the pulses have the following duty cycle:

Photo 2

The valve is nevertheless closed and no air enters the intake manifold.

Fuel consumption is maximum for this mode carburetor operation.

If the signal from the oxygen sensor is high, the duty cycle increases:

Photo 3

Air enters the manifold, reducing the vacuum in front of the fuel jets.

Fuel consumption is reduced.

All this is repeated, with the switching frequency of the oxygen sensor.

When the engine is warm and theTHR SW, the accelerator pedal is pressed. The ECM (engine control module) gives three to four wide “test” pulses to the EACVvalve. And then it is guided by the readings of the oxygen sensor.

Removing the cover air filter, you can hear a short hissing sound of air being admitted into the manifold each time the throttle is opened. Based on this fact, one can judge the performance of the control system.

The block is quite primitive, and therefore opens the valve, even if instead of an oxygen sensor (oxygen sensor) you “slip” a slightly discharged 1.5 volt battery into it (air in the EAC intake fittingVwill hiss constantly).

The feedback does not work until the engine warms up to approximately + 50°.

Responsible for this Vac SWlocated on the wall of the engine compartment:

Photo 4

Vac SW-vacuum switch

The contact in it remains open until the temperature switch applies a discharge to it (TVSV).

Convenient control of vacuum supply and operationVAC SW LED.
(...a little about the “control”: the needle from sewing machine+ 1 Kom resistor + LED from a Chinese lantern + cold welding. Simple, fast, and most importantly - clearly visible).

There will also be no OS ( feedback) under heavy loads (there is simply no vacuum in the collector)

At idle, the OS also turns off when the limit switch on the carburetor opens - (THR SW)

It is also convenient to control with an LED.

(This one often gets stuckS.W., due to the “hardened” rubber corrugation on it).

The contact is not closed - there is no feedback - consumption is more than 10l/100km

Photo 5

Emission control scheme

(simple, self-drawn).

Photo 6

There may also be an additional switch for engine temperature (OS prohibition on a cold engine). In this scheme, which is more common, the cold prohibition is carried out by a temperature switch (TVSV).

There is no photo of it, but this switch can be easily found on intake manifold on the left (if we are driving).

It is screwed into the engine water cooling system and has 5 (4+1) vacuum connections. The color is light green.

Please note that the signal from the oxygen sensor (oxygen sensor) goes to the ECM (engine control unit), and from it the OCM goes to the diagnostic block. The voltage there is about 6 volts, so again, everything is easily diagnosed and checked with an LED.

A cherished set of letters for any damn carburetor... AISAN.
The device is wildly fanaric, the principle of operation is clear even to a child... But when it comes to repairs...
So, let's start sharing... First, we need to decide what we want from the carb.
It eats a lot - overflow of the float, incorrectly configured idle speed.
Do not start when cold without the 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 when cold... Nothing helps, only 50 grams of gasoline in the first chamber. - Accelerator + air + jets.
It does not stall immediately / does not stall / - the solenoid valve or the jet is on it.
When you release the pedal, the speed does not drop to idle - most likely the accelerator cable.

Now what to pay attention to when stretching your crooked hands to this device. (Your hands are already straight after 2 dead carbs! :)

1. Remember - if you climbed it yourself, there is no way back!!! In Ussur, after the crooked handles, carburetor workers don’t look at cars. So if you take up the tug, don’t say that it’s not hefty.
2. When disassembling, the most difficult part is the piece of hardware that goes from the throttle to the air damper. Broke on both carbs. Needed for automatic opening and closing of the air damper. If it breaks down, it starts big problems with cold start.
3. Gasket - it would be better to be very gentle with it. The first one was torn... I couldn’t restore it... The second one is still alive.
4. It doesn’t say anywhere, but if a metal ball falls out during disassembly, IT DID NOT JUST FALL OUT!!! IT'S FROM THE ACCELERATING PUMP!!! I lost my 2... :)

If this message did not help you and you broke something, write... I have a distorted and half-dead carb. But starting and consumption is about 10 outside the city and 12 in the city (now). In the summer it was 8/10.

Adjusting XX is baby talk. So this procedure I'm not describing it. I'll just say the following:
1. On 3E quantity and quality (two screws) on the rear side of the carb (which is further from the hood and closer to the carrier).
2. On the 4e, the quality bolt at the rear is the same as on the 3E, but the quantity is two bolts on the passenger side.
The accelerator cable is located on the carrier side, the bimetal spring is on the carrier side above the cable.
Solenoid valve at the rear of the carb.

The vacuum system is needed only for:
1. Opening of the secondary chamber during acceleration.
2. Opening the air damper during acceleration.
3. shift of the advance angle when reaching N number of revolutions.

Does not affect consumption. It also does not affect dynamics, movement and other characteristics. It may drive a little worse, it will be more capricious, but it will work and won’t consume gas. So we dig the vacuum system last - so that the devil can break his leg!!!

Carburetors for loaders

Entrust the repair of the carburetor, its maintenance, installation of the repair kit, flushing, adjustment, preferably to a specialist who has extensive experience in working with fuel systems loader 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 loaders in the future.

On forklifts Nissan, Komatsu, Mitsubishi, TSM installed single-chamber Nikki carburetors with an automatic idle system.

Toyota loaders use an Aisan carburetor, also with automatic cold start and warm-up. Toyota four ton loader with six-cylinder engine 7FG40 has a two-chamber Aisan carburetor with semi-automatic cold start.

Early models of Toyota loaders were equipped with carburetors with manual control cold start.

Carburetors with manual cold start were also used in early Mitsubishi models, 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.

Kit possible malfunctions approximately the same, except that the following happens:

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 seat area is tightly clogged solenoid valve– 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 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 repair or replacement.

Before adjusting the carburetor, and especially repairing the carburetor of a Toyota loader, it is necessary to check the condition of the engine.

Loader engine diagnostics include:

Valve clearances.

State high voltage wires, distributor caps and spark plugs.

Condition of the ignition distributor (distributor)

Compression measurement in cylinders.

Air filter condition.

Checking the level and viscosity of the engine oil.

Cylinder air leak test to check condition 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 (also known as the 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 settings idle speed or clogged idle speed channel)

2) Unstable idling (idles float, revs fluctuate, idle disappears)

3) Carried out when pressing the gas.

4) Stalls when you press the gas.

5) It stalls when there is a gap to the floor.

6) Interruptions in engine operation during degassing.

7) Loss of power when “gas to floor”.

8) White, blue, blue smoke exhaust: has nothing to do with the operation of the carburetor.

The carburetor is used to mix fuel with air and then deliver the resulting mixture to the car engine, where it burns and creates pressure on the valves of the engine block. The resulting force causes the car to move, pick up and slow down

Carburetors are still used on older models of cars, trucks, small airplanes, and motor boats.

The carburetor is a mechanism that does not require special Maintenance and daily care, but it needs good tuning and adjustment. After this, all parts should work optimally. This will have a beneficial effect on the operation of the car engine.

Your car will have a well-coordinated engine if you thoroughly learn how to properly adjust the carburetor. It is the first to be checked if any problems arise 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 the engine internal combustion, consisting of a diffuser, a throttle valve, a jet and a float chamber.

The operation of the carburetor is based on a physical phenomenon called the Bernoulli principle, the Venturi effect, known to many from the school physics curriculum. 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 motor is adjustable throttle valve, and she - using the accelerator pedal.

The main problems in the operation of the carburetor

1. Gasoline leak. If gasoline leaks are visible, check the float chamber and 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.
2. Dirty candles. The appearance of soot with an odor on the spark plugs indicates an excessive supply of fuel. It can be caused by a burnt out valve or an unadjusted float. We need to check and fix the problems.
3. The engine is 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 this way: the wire must be disconnected from the carburetor and with the engine running, move the throttle manually. The speed drops to the desired level, which means the wire is faulty. If not, then there is a problem with the carburetor. First of all, you need to clean it from dirt and corrosion.

Adjustment

When screwing the quality screw in all the way, the restrictive plug may break. If necessary, replace the broken plug with a new one.

After correct adjustment The idle system must guarantee the speed specified 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 met, this may lead to engine malfunctions. Subsequent repairs will require large financial investments.

If you do not have sufficient experience in performing this type of work, then perform this procedure for the first time with an experienced specialist, especially if the engine has an OZONE carburetor. A specialist will help you correctly adjust the CO content in exhaust gases within acceptable values.

If problems arise in setting, you need to carefully turn the screw that regulates the quality of the mixture. Use the same screw to set the optimal rotation speed, as with the previous setting.

Video

Useful video about cleaning and adjusting the carburetor: