How to repair a four stroke gasoline engine, how a four stroke gasoline engine works

1. Gasoline engine failure.

1.Gasoline engines are difficult to start.

There are three main reasons for this failure: the fuel system is not normal. The ignition system is not working properly. Cylinder compression is not normal.

Improper fuel system is a very common cause of difficulty starting. Please note the following:

Whether the fuel tank is filled with fuel, whether the oil switch is turned on, and whether the ventilation hole of the fuel tank cover is blocked.

Open the carburetor inlet hole to check whether the carburetor is oiled, and the carburetor main measuring hole. Whether the starting hole is blocked.

Whether the fuel is added correctly or the fuel quality is too poor, whether it is stuffy.

Please pay attention to the following points for the ignition system:

Whether the spark plug can ignite properly.

Whether the ignition coil is out of flame.

Whether the kill switch is in the ON position.

If the cylinder compression is abnormal, please pay attention to the following points:

Whether the cylinder seal is good, and whether there is air leakage on the joint surface.

Whether the valve is leaking or not.

Whether the piston ring is broken.

2.The gasoline engine is not powerful enough.

The fault is manifested in the slow increase of the speed when the throttle is increased, and the speed decreases or even stalls when it is severe. There are two main reasons for this failure: the fuel system is not normal. Cylinder compression is not normal.

The most common cause of this failure is a malfunctioning fuel system. Please note the following:

The carburetor is not working properly, resulting in the mixing ratio not meeting the requirements.

The air filter is clogged or the air inlet is not tightly closed.

If the cylinder compression is abnormal, please pay attention to the following points:

Whether the cylinder seal is good, and whether there is air leakage on the joint surface.

Whether the valve is leaking or not.

There are a few other reasons that can cause the failure. For example, the ignition angle is not equal.

3.The gasoline engine suddenly stalls during operation.

There are two main reasons for this failure: the fuel system is abnormal. The ignition system is not working properly.

Please pay attention to the following points in the fuel system:

Whether you run out of fuel.

Whether the carburetor is faulty.

Whether the oil circuit is unblocked.

Please pay attention to the following points for the ignition system:

Spark plug breakdown or carbon deposition short circuit.

The ignition coil is short-circuited.

The spark plug cap is damaged.

There are a few other reasons that can cause the failure. Such as pulling cylinders. Valve detachment, etc.

4.If the gasoline engine is overheated, please pay attention to the following points:

The ignition time is incorrect.

Insufficient oil. Failure of the air-cooled system. If the impeller is damaged. There is debris in the heat sink clogged. Air deflector leakage, etc.

Cylinder. Piston. Piston ring wear causes air trapping.

The rotational speed is too high or the crankshaft bearing is damaged.

5.Please pay attention to the following points when the gasoline engine is running

Piston. Connecting rod. Piston pins and pin holes are worn.

Top cylinder. The piston ring is broken.

The fuel is not right. The gasoline engine overheated.

The valve clearance adjustment is incorrect.

The flywheel is loose.

There bad repair there, circuits, piston cylinder liners.

<> "How a four-stroke gasoline engine works.

The interpretation of stroke is the stroke, the process of getting from one position to another; The vast majority of gasoline engines are four-stroke engines, and a four-stroke engine means that the sum of the processes from top dead center to bottom dead center and bottom dead center to top dead center is four times. So how does a four-stroke gasoline engine work?

1.The working principle of the four-stroke gasoline engine is relatively simple: after four strokes of air intake, compression, work and exhaust, a working cycle is completed, and in this process, the piston reciprocates up and down and moves four strokes, and the corresponding crankshaft rotates for two weeks.

2.The first is the intake stroke: the piston runs from top to point and down to point. The intake valve opens and the exhaust valve closes. Due to the difference in air pressure, the mixed combustible gas is sucked in.

3.Again, there is the compression stroke: the piston runs from bottom to point, and the intake and exhaust valves are closed. The flammable gas mixture is compressed and almost reaches the ignition point.

4.Later came the power stroke: the intake and exhaust valves were still closed. When the piston is about to run to the point for the second time, the spark plug ignites the combustible gas mixture. The flammable gas mixture expands, moving the piston from top to bottom.

5.Finally, there is the exhaust stroke: the piston runs from the bottom to the point, the intake valve closes, and the exhaust valve opens.

That's all there is to know about how a four-stroke gasoline engine works.

1.Introducing the four-stroke gasoline engine.

A four-stroke gasoline engine (four-stroke engine) is a commonly used type of gasoline engine that has four strokes of spark ignition, fuel injection, compression, and exhaust gases, and is suitable for a variety of uses such as small vehicles, motorcycles, generators, and light boats.

2.The reason why the four-stroke gasoline engine can not start the stove.

Four-stroke gasoline engines may have various problems during the start-up process, resulting in failure to start properly. Here are a few common reasons:

3.The battery is low.

A low battery charge can be one of the main reasons why a four-stroke gasoline engine won't start. If the battery state of charge is weak, the car's engine does not have enough power to start the engine, so the battery level needs to be checked and replaced if needed.

4.The engine has insufficient fuel or the fuel quality is not up to standard.

If the vehicle has not been used for a long time, it can lead to fuel aging, condensation, and cloudiness. This may affect fuel** or cause fuel lines to become clogged. Try replacing the fuel or cleaning the fuel system to fix the problem that won't start.

5.Faulty spark plugs.

Spark plugs are one of the most important components in a car's gasoline engine. If the spark plug fails, the car engine fails to ignite. Therefore, it is important to check and replace the spark plugs regularly.

6.The air filter is clogged.

Air filters can filter out dust and impurities that invade the engine, and if the filter is clogged, it can lead to gas pressurization and engine burnout. It is recommended to change or clean the air filter regularly.

7.Gas regulator malfunction.

The gas regulator is the regulator of a four-stroke gasoline engine and is responsible for expensive gas**, and if the gas regulator fails, it cannot provide enough gas supply, resulting in difficulty in starting. Therefore, it is advisable to regularly inspect and maintain the gas conditioner.

8.Conclusion.

Four-stroke gasoline engine starting problems can be caused by a variety of reasons, but most can be prevented and resolved with maintenance and regular inspections. If the engine does not start, it is recommended to find a professional maintenance personnel for troubleshooting.

The reasons why the four-stroke gasoline engine cannot be started are as follows: 1. Compression failure: (1) Incorrect valve clearance; (2) The contact part between the valve and the valve seat is worn; (3) The camshaft ruler convex hull part is worn; (4) The cylinder gasket seal is not high or damaged; (5) The piston ring is worn; (6) The camshaft timing point assembly is incorrect; (7) The pressure reducing valve is not working properly.

2. Ignition failure: (1) The ignition system has abnormal phenomena such as weak ignition energy and fire failure; (2) The ignition timing is incorrect; (3) The oil alarm device is not working properly; (4) Short circuit of grounding wire; (5) Short circuit of the ignition switch.

Hello dear and happy to answer for you. Kiss the four-stroke gasoline engine crankshaft rotates 10 times, completes (40) stroke, and does (20) work externally For four-stroke internal combustion engines, one working cycle does work only 1 time, and external work is done 10 times, indicating that 10 working cycles have been completed; Each working cycle goes through 4 strokes of Xiangshanyan and the crankshaft rotates for 2 weeks, so 10 working cycles go through 10 4 = 40 strokes and the crankshaft rotates 10 2 = 20 cycles. So the answer is:

40；20.A working cycle of an internal combustion engine consists of four strokes, namely: suction, compression, work, and exhaust; In a working cycle, only the power stroke is done externally, and the crankshaft rotates for two weeks I hope this only service can help you, you can click on my avatar to follow me, and if you have any questions in the future, you can consult me again, and look forward to serving you again.

Wishing you well; Happy life, everything goes smoothly [warm] [warm] [warm.

Kiss the four-stroke gasoline engine crankshaft rotates 10 times, completes (40) stroke, and does (20) times of work to the outside of the internal combustion engine, a working cycle to do work only 1 time, external work 10 times, indicating that 10 work cycles have been completed; Each duty cycle goes through 4 strokes and the crankshaft rotates for 2 cycles, so 10 duty cycles go through 10 4 = 40 strokes and the crankshaft rotates 10 2 = 20 cycles. So the answer is: 40; 20.

A working cycle of an internal combustion engine consists of four strokes, namely: suction, compression, work, exhaust and collapse; In a working cycle, only the power stroke is done externally, and the crankshaft rotates for two weeks I hope this service can help you, you can click on my avatar to follow me, and if you have any questions in the future, you can consult me again, and look forward to serving you again. Wishing you well; Have a good life,

The crankshaft of the four-stroke gasoline engine rotates 10 times, completes the (40) stroke, and does (20) work externally For the four-stroke internal combustion engine, there is only 1 work cycle to do work, and 10 times to do work externally, indicating that 10 work cycles have been completed; Each duty cycle goes through 4 shirt strokes and the crankshaft rotates for 2 cycles, so 10 duty cycles go through 10 4 = 40 strokes and the crankshaft rotates 10 2 = 20 cycles. So the answer is: 40; 20.

A working cycle of an internal combustion engine consists of four strokes, namely: suction, compression, work, and drainage of collapsed gas; In a working cycle, only the power stroke is done outside the bend, and the crankshaft rotates for two weeks

Four-stroke concept.

Intake fuel injection. Compression evaporation.

Expansion does work. Exhaust gases.

Each step is a stroke, and the four steps are combined to achieve efficient combustion. The principle of intake fuel injection is to use the positive pressure of the head-on collision wind in the car and the negative pressure suction generated by the downward operation of the piston to suck in air; The ECU trip computer calculates the amount of fuel injected into the engine based on the amount of oxygen in the air, which is called the "air-fuel ratio", and mixes the oil and gas after inhaling the air and injecting the fuel, which lays the foundation for the second stroke.

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The compression stroke is a crucial step, as the piston moves upwards in the cylinder from bottom to top under the propulsion of the crankshaft. The purpose of this action is to compress a large volume of air into a small volume, and in the process of compression, the violent movement of molecules will produce high temperature due to friction - the purpose of compressed air is to heat up, and use the raised temperature to atomize the liquid fuel to evaporate into a gaseous state. It is important to know that the combustion rate of gaseous mixed oil and gas is much higher than that of liquid fuel oil, and the significance of increasing the speed is to fully combustion.

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Knowledge points: The concept of engine speed (rpm) is the speed of the crankshaft, which refers to how many revolutions are rotated in one minute, and the speed can also be understood as how many times work is done in a minute. Assuming that the engine runs at 2000rpm, then 2000 times of "intake and detonation" actions will be completed in one minute, and the time left for the expansion power stroke is the millisecond standard.

In order to fully burn and partially convert the mixed oil and gas into effective work (power) in such a short time, the premise is that the mixed oil and gas burn very quickly, which is where the compression stroke evaporates the fuel.

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Expansion stroke: Described in the vernacular as "ignition work" or "detonation push", a gasoline engine uses an electric arc from a spark plug to ignite a mixed oil gas, much like the concept of igniting fuel with a lighter. The diesel engine uses the ultra-high compression ratio to directly heat the air to a very high temperature, and uses the high temperature to make the diesel spontaneously ignite to achieve expansion work.

The so-called expansion refers to the process of violent movement of molecules in the chemical reaction during combustion, using the driving force of the movement to drive the piston to move from top to bottom, the piston drives the connecting rod and the connecting rod to promote the crankshaft to rotate, and the flywheel at the power output end of the crankshaft will output the rotating power (moment) to the gearbox, and drive the wheels to rotate through the transmission system.

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Exhaust stroke: The above three steps are completed in the cylinder of the engine, and the exhaust gas generated by combustion must be discharged from the cylinder to start the next round of "pressure and burst exhaust" of lead fiber, so exhaust is naturally an action that must be completed. So far, the four-stroke internal combustion engine has completed an energy conversion, and the four-step process of completing the four-step process is from low speed to high speed of the fuel-powered vehicle with 1000 6000 times per minute.

The four-stroke engine work is mainly as follows: intake stroke, compression stroke, power stroke, exhaust stroke!

Intake stroke: the piston is carried downward by the inertia of the crankshaft, resulting in vacuum, and the pressure difference makes the outside air enter the engine cylinder, at this time the intake valve is opened, due to the relationship between the distribution phase, at the beginning of the intake stroke, the exhaust valve should also be opened for a period of time (exhaust delay and closure angle) to ensure that the exhaust gas in the cylinder is clean.

Compression stroke: The piston is carried upward by the crankshaft inertia, compressing the mixer, at this time, the pressure in the cylinder gradually increases, and before the piston reaches the top dead center, the spark plug jumps (ignition advance angle) and ignites the mixture. At the beginning of the compression stroke, the intake valve should be continuously opened for a period of time (intake delay and closure angle) to ensure that the intake is sufficient.

Power stroke: The piston moves downward under the pressure of mixture combustion and volume expansion, and the piston pushes the crankshaft to run, and the crankshaft generates torque and outputs power outward. At the end of the power stroke, the exhaust valve opens (exhaust advance angle) and the air is vented in advance by the pressure difference between the air pressure in the cylinder and the outside atmospheric pressure.

Exhaust stroke: The piston is carried upward by the crankshaft inertia, and the exhaust gas in the cylinder is pushed out of the cylinder through the live defeat Housser, and before the exhaust stroke ends, the intake valve is opened to ensure that the engine is fully intake.