What is the reason why there is a knocking sound at the medium speed of the diesel engine

1. The oil supply time is too early. When the upward movement of the diesel engine piston has not reached the specified injection position, the fuel injector begins to inject fuel, so that the fuel combustion is advanced, and the high-pressure gas in the cylinder hits the piston, making a rhythmic "click, click" crisp knocking sound, reducing the throttle, and the knocking sound is obvious.

The elimination method is to adjust the fuel supply advance angle, that is, to increase the gasket between the fuel injection pump and the gearbox to delay the fuel supply time to meet the specified fuel injection time. For each additional millimeter of gasket, the oil supply advance angle can be delayed.

2. Poor fuel combustion Fuel injection pressure is too low, injector dripping, fuel injection atomization is poor and the fuel supply time is too late, etc., will cause poor fuel combustion and cause cylinder knocking.

Elimination method: This kind of fault caused by the cylinder knocking sound is low, hoarse, accompanied by engine overheating, black smoke or exhaust pipe discharge, fire and other phenomena. The injector should be removed for inspection and adjustment, adjust the oil supply time, and replace new parts if necessary to make it comply with the regulations.

3. Wear of the oil outlet valve After the oil outlet valve is worn, on the one hand, the gap between the pressure reducing ring belt and the inner hole of the valve seat becomes larger, the sealing becomes poor, and the pressure reduction effect becomes worse; On the other hand, the residual pressure in the high-pressure oil pipe is too high, and the oil supply increases, causing the fuel to deflagrate and knock on the cylinder, and the knocking sound is especially obvious when the throttle is reduced.

The elimination method is to replace the oil outlet valve and valve seat. It is necessary to remind the operator that the diesel engine in good technical condition sometimes emits a rhythmic knocking sound when running at low speed, which is caused by the vibration wave generated by the sharp increase in airflow pressure during the fuel combustion process, rather than the knocking cylinder mentioned above.

The medium-speed cylinder knocking of diesel engine is the impact sound caused by the excessive gap between the piston pin and the copper sleeve, and the cylinder knocking caused by the premature oil supply time is generally only when it is suddenly accelerated.

It's okay to knock on the cylinder The diesel engine that knocks on the cylinder is strong.

The reasons for the knocking sound of the diesel engine are:

1.Ignition angle too early: In order for the piston to gain the kinetic nuclear force immediately after compressing the top dead center when it enters the work stroke, it is common to ignite the piston early before it reaches the top dead center (because it takes some time from ignition to complete combustion).

However, premature ignition will cause most of the oil and gas to burn while the piston is still in the compression stroke, and the unburned oil and gas will spontaneously ignite under great pressure, resulting in deflagration. So don't start the engine too early.

2.Excessive carbon deposition in the engine: Excessive carbon deposition in the combustion chamber of the engine will not only increase the compression ratio (high pressure of dry and open excavation), but also produce high temperature hot spots on the surface of the carbon deposit, causing the engine to knock. Therefore, it is necessary to clean up the engine carbon deposits on a regular basis.

3.High engine temperature: If the engine is in too hot environment, the intake air temperature will be too high, or the engine cooling water will be poorly circulated, resulting in high engine detonation. Do not start the engine in an environment where the temperature is too high to avoid starting.

4.Incorrect air-fuel ratio: An air-fuel ratio that is too thin will increase the combustion temperature, resulting in an increase in engine temperature, so it is prone to detonation.

5.Low octane number of fuel: The octane number is an indicator of fuel knock resistance.

The higher the octane number, the stronger the anti-knock performance. Engines with high compression ratios have high combustion chamber pressures, and if fuel with low knock resistance is used, it is easy to knock. If the diesel engine knocks on the cylinder, it should be checked and repaired at a professional auto repair point in time to avoid greater safety hazards.

Summary. Hello, I am your exclusive technician, attentive, careful, dedicated to answering your car questions, for you to find the corresponding problem solutions and solutions! The reason is that the inside of the engine burns badly.

1.Fuel quality problems will lead to insufficient fuel combustion, which will lead to cylinder knocking. 2.

Low-pressure pipes if they are clogged. It can also lead to poor oil supply. It then affects the normal operation of the engine and causes the cylinder to knock.

You can change the fuel first. Or inspect low-pressure pipes.

Hello, I am your exclusive technician, attentive, careful, dedicated to answering your car questions, for you to find the corresponding problem solution and solution! The reason is that the inside of the engine burns badly. 1.

Fuel quality problems will lead to insufficient fuel combustion, which will lead to the phenomenon of cylinder knocking. 2.Low-pressure pipes if they are clogged.

It can also lead to poor oil supply. However, after the judgment of the pants, it affects the normal operation of the engine and causes the cylinder to knock. You can change the fuel first.

Or inspect low-pressure pipes.

There are two kinds of high-pressure oil pumps, one is when it needs to be aligned, the other is when it needs to be aligned, and the high-pressure oil pump that does not need to be aligned only has two oil pipes. If you make a mistake, it will not affect the normal operation of the engine.

If it is the kind of oil pump that needs to be aligned. If it is installed incorrectly, it will affect the acceleration of the engine, and there will be a knocking sound.

Summary. This may be a failure in the fuel system of the diesel engine, a leak in the diesel pump, a valve that does not open, or other faults, which may cause a knocking sound and a normal throttle increase. The fuel system should be inspected immediately, and damaged parts should be replaced or repaired to ensure proper engine operation.

This could be a failure in the diesel engine's fuel system, a leaking diesel pump, a valve that won't open, or something else that could cause a cylinder knock and a throttle increase. The fuel system should be inspected immediately, and damaged parts should be replaced or repaired to ensure proper engine operation.

The vibration force of the 3 high-pressure tubing is different.

It may be because the specifications of the three high-pressure tubing are different, or the installation position is different, so the vibration force will be different. In addition, the materials used in different high-pressure tubing may also affect the size of the vibration force.

Hello, the knocking sound of a single-cylinder diesel engine is caused by the wear or failure of some parts inside the engine. When there is a problem with these parts, they rub against other parts, creating a knocking sound. However, if the single-cylinder diesel engine has not been knocked on the cylinder for a long time, there may be several reasons for the disadvantages:

1.Engine components have been worn to a point where the clearance is reduced and friction is reduced, which reduces the production of knocking sounds.

2.Parts inside the engine have been replaced or maintained, eliminating the root cause of the knocking sound.

3.The engine is in good condition and has no faults or problems.

4.Noise control for single-cylinder diesel engines has been improved to reduce noise generation.

In short, the single-cylinder diesel engine has not made a sound of knocking on the cylinder for a long time, which may be due to the combined effect of a variety of factors, and a comprehensive inspection and analysis is required to determine the specific original Butpiin.

When the single-cylinder diesel engine is used for a long time, there will be no sound of cylinder knocking. This is due to the serious wear of the internal parts of the diesel engine, which affects the stroke of the piston, reduces the number of collisions between the cylinder block and the piston, and weakens the sound of knocking on the cylinder. In addition, the long-term use of diesel engines will also lead to the deposition of combustion on the cylinder block, the wear and tear of internal parts such as the piston in the cylinder, and the damage to the piston rings, etc., which will lead to the weakening of the sound of the diesel state or the engine knocking on the cylinder.

In addition, the long-term operation of the diesel engine will produce high temperatures, and the internal parts of the diesel engine will also be affected by the high temperature, so that the piston stroke of the diesel engine will be affected, thereby reducing the sound of the diesel engine knocking cylinder. Therefore, if the knocking sound of the single-cylinder diesel engine is weakened, it is best to repair it in time to avoid more serious damage.

Summary. There is a knocking sound in the diesel engine, and there is no refueling at the waiting speed, which is generally caused by the bending or twisting of the engine connecting rod. Excessive carbon deposition in the engine leads to an increase in the compression ratio of the engine, resulting in detonation.

Poor engine lubrication conditions lead to normal lubrication friction between the piston and the cylinder wall. The use of gasoline model is not right, resulting in too high pressure in the cylinder due to too fast speed, and the piston skirt hits the cylinder wall and there is a strange knocking sound.

Hello dear, it's a pleasure to answer for you.

There is a knocking sound on the pin of the diesel and balance oil engine, and there is no refueling at the waiting speed, which is generally caused by the bending or twisting of the engine connecting rod. Excessive carbon deposition in the engine leads to an increase in the compression ratio of the engine, resulting in detonation. Poor engine lubrication conditions lead to normal lubrication friction between the piston and the cylinder wall.

The gasoline model makes the orange stop incorrect, resulting in too fast speed, causing the pressure in the cylinder to be too high, and the piston skirt hitting the cylinder wall and the abnormal sound of knocking the cylinder.

It's not easy to code words, and it's troublesome to help light up a thumbs up. If you have any questions in the future, you can consult me at any time, I wish you a happy life and a good fortune!

The reasons for the knocking of the cylinder of the diesel EFI engine are as follows: 1. The fuel supply time is too early. When the upward movement of the diesel engine piston has not reached the specified fuel injection position, the fuel injector begins to inject fuel, so that the fuel combustion is advanced, and the high-pressure gas in the cylinder hits the piston, making a rhythmic "click, then clever and bad" crisp knocking sound, reducing the throttle, and the knocking sound is obvious; 2. Poor lubrication of the cylinder wall.

Poor lubrication conditions, low oil pressure or low oil viscosity, poor splash lubrication of the cylinder wall, normal lubricating oil film can not be formed between the piston and the cylinder wall, and the piston and the cylinder directly collide and knock the cylinder; 3. The connecting rod is wide and bent or twisted and deformed, and the assembly of the piston connecting rod group makes the piston skew in the cylinder beyond the allowable range, which not only makes the sealing deteriorate, the lubrication strip deteriorates, but also causes the cylinder to wear abnormally, so that the piston and the cylinder wall knock and there is a sound. @2019