What s going on with the clattering of the engine

Reasons for the engine clattering:1. Aging or loosening of the foot glue: The foot rubber is the rubber block between the engine and the frame.

Its function is to reduce the vibration and cushioning of the engine when working, and to fix the engine. Once these feet are aged or loose, the engine will shake, and in severe cases, there will be a "click" abnormal sound, which only needs to be replaced with a new foot rubber.

2. The mixture is too thick: when the engine mixture is too thick, the phenomenon is: it is difficult to accelerate after starting, and the engine runs unevenly; black smoke from the exhaust pipe, and the engine is accompanied by a clattering sound; Engine power decreases, fuel consumption increases.

This is mostly related to carbon deposits, filter clogging, etc., and generally does not need to be overhauled.

3. "Knocking cylinder" abnormal sound: due to poor lubrication conditions, excessive wear of the piston and cylinder wall, resulting in the gap matching tolerance between the piston and the cylinder wall exceeding the normal range, and the piston skirt and the cylinder wall collide when the engine is running, resulting in a crisp sound of "da-da-da", which is generally more obvious when running at idle speed or low speed.

The relationship between squeak and squeak and engine speed The presence of most common squeak and squeak in an engine depends on the state of the engine's rpm. The squeak is only there.

2.The relationship between abnormal noise and load There is an obvious relationship between a lot of abnormal noise on the engine and its load, and the method of relieving the load can be taken cylinder-by-cylinder during diagnosis.

3.The relationship between abnormal noise and temperature When the temperature rises, the sound decreases or even disappears. The reason for the sound is the gap between the piston and the cylinder wall.

4.The relationship between squeak and squeak and engine work cycle The squeak and squeak fault of the engine is often obviously related to the work cycle of the engine, especially.

5.The relationship between abnormal noise and engine parts When abnormal noise occurs in the engine, a certain degree of vibration will inevitably be generated, according to the characteristics and parts of the vibration.

The relationship between squeak and squeak and engine speed The presence of most common squeak and squeak in an engine depends on the state of the engine's rpm. The squeak is only there.

2.The relationship between abnormal noise and load There is an obvious relationship between a lot of abnormal noise on the engine and its load, and the method of relieving the load can be taken cylinder-by-cylinder during diagnosis.

3.The relationship between abnormal noise and temperature When the temperature rises, the sound decreases or even disappears. The reason for the sound is the gap between the piston and the cylinder wall.

4.The relationship between squeak and squeak and engine work cycle The squeak and squeak fault of the engine is often obviously related to the work cycle of the engine, especially.

5.The relationship between abnormal noise and engine parts When abnormal noise occurs in the engine, a certain degree of vibration will inevitably be generated, according to the characteristics and parts of the vibration.

One reason is that the viscosity of the oil you use is not enough to cause poor lubrication, and it is generally recommended that you use a 40-grade engine oil. Such as satisfied.

The "click" of the car engine is generally the sound of the valve or the fuel injector. The canister solenoid valve also has this sound, but the sound is brittle. There is a way to distinguish, that is, to give a little oil at idle speed to see if the frequency changes, if the frequency does not change, it is the sound of the solenoid valve, if the frequency changes, it should be abnormal noise at the valve.

If you can't hear it clearly in the car, the problem is not big, the vehicle will have a corresponding clicking sound, one is the sound of the fuel injector working, the other is the valve part, and there is a similar sound, which is the sound of the timing chain.

In general, when the car starts cold, the engine sound will be slightly louder than when the car is hot, as long as the sound sounds uniform and soft, not harsh, there is generally no problem. This is due to the fact that the gap between the cylinder wall and the piston is not yet optimally sized during cold driving, and the lubrication of the oil is not sufficient. Usually when the engine block temperature reaches about 95 degrees, the sound will return to normal.

The cause of the oil. Inferior engine oil or not changing the engine oil for a long time, lack of engine oil, etc., can easily lead to increased friction between the valve and the duct and the hydraulic tappet, etc., so that the various sounds in the engine are louder.

Hello master, what's wrong with my car shining? Just changed the oil,

The engine rattle depends on the state of the engine's rpm. The following are the causes of abnormal noise: 1. Abnormal noise only exists when it is running at idle speed or low speed.

The reasons for the sound are: the gap between the piston and the cylinder wall is too large; The piston pin assembly is too tight or the connecting rod bearing is assembled too tightly; The gap between the tappet and its guide hole is too large; The profile of the valve cam is worn; Sometimes the starting grip is loose and the pulley makes a sound (noticeable when the speed changes). 2. Maintain a certain speed when the sound is disordered, and a short sound is made when the deceleration is sharp.

The reasons for the sound are: the camshaft timing gear is cracked or its fixing nut is loose; crankshaft breakage; The piston pin bushing is loose; The axial clearance of the camshaft is too large or its bushing is loose. 3. The abnormal noise still exists when the engine accelerates sharply and maintains high-speed operation.

The reasons for the sound are: the connecting rod bearing is loose, the bearing is burned or the size does not match and rotates; loose crankshaft bearing or bearing burning capacity; The piston pin is broken; crankshaft breakage;

The sound of the engine clicking, this kind of fault needs to be analyzed on a case-by-case basis: 1. If it is the sound of clattering in the cold car state, and the sound disappears in the hot car state, this is generally caused by the internal lubrication of the engine is not in place, or the hydraulic tappet is caused by wear. 3. If it is a cold car, a hot car has this abnormal sound, it is generally necessary to focus on checking the lead to check the formal chain, or the hydraulic tappet, you can first add the appropriate excitation point engine internal repair agent to try to see if it can solve the problem, if not, you need to replace new parts.

It could be the sound of the engine's internal valves working. If it is a new car, it is inevitable that other cars (such as belts, bearings, etc. may be damaged) are available.

On the issue of abnormal noise of automobiles, it is difficult for ordinary car owners to distinguish which ones are abnormal noises and which ones are reasonable abnormal noises. Only nearly 20% of the vehicles that went to the repair shop to detect abnormal noises really had problems. In the case of a turbocharged engine, there is a must be a difference between the sound and the sound of a naturally aspirated engine; Models with engine guards may also make noises due to friction; After some car owners come into contact with different cars, it is likely that due to their lack of understanding of mechanical knowledge, they mistake reasonable abnormal noise as a vehicle failure.

Therefore, learn to distinguish the abnormal noise of the car and avoid wasting time and energy.

The identification of car noise is limited, and it is difficult to use special instruments to measure the sound of the car, and the sound of the car can only be described and compared with the judgment of the sound in daily life. For example, the "rattle" sound caused by the dry friction of the bearing, and the "click" sound similar to the small hammer hitting the cement floor caused by the excessive valve clearance.

1. Correctly distinguish between normal and abnormal sounds.

The vibration of each mechanism in the work of the car will emit a variety of sounds, but the sound does not mean that the car is faulty, in order to avoid unnecessary disassembly, we must first distinguish between normal sound and abnormal noise. The normal vibration sound of each system component (such as the noise on the surface of the engine), the impact sound of the gear when shifting, the air intake sound and exhaust sound of using gas as the working source, and the gear meshing noise are all normal sounds. Abnormal noise (abnormal noise) can be divided into slight noise, general noise and malignant noise according to the impact on the performance of the car.

Slight noise, such as the flashover sound of high-voltage electric leakage, the slight loose sound of rolling bearings, etc., the general volume is small, the degree of wear of the parts is not large, and there is no significant change for a long time, and this kind of fault can still maintain the normal operation of the car without repair.

3. When diagnosing abnormal noise, attention should be paid to creating good auscultation conditions and trying to eliminate the interference of other noises, so as not to affect the accuracy of judgment.

It is best to consciously amplify or reduce the sound, that is, use a screw or other metal rod as a stestological instrument to contact the sound part to amplify the sound, or use a single cylinder fire cut-off to reduce the sound to meet the diagnostic needs. The auscultation site should be kept quiet to minimize human interference.

The sound of the clattering engine is almost all the valves, and if it is loud, the valves and camshafts are badly worn and need to be replaced.

This sound may be from a high-pressure oil pump, and if it is from a high-pressure oil pump, it is also normal. This sound may also be made by the valve. If the valve is issued, it is caused by too large valve slip clearance or low oil pressure.

If the oil pressure is too low, you need to check if the oil is sufficient.

Excessive valve clearance is caused by long engine mileage and valve wear. If you want to solve this problem, you need to replace the valve lifter with a new one.

Many cars have a very noisy engine when it first starts, but it stops after driving for a while. This is because the oil is viscous when the engine is first started. At this point, there is not enough oil in the valve lifters of a moving car, which can lead to excessive valve clearance.

After a period of driving, when the normal operating temperature is reached, the fluidity of the oil will become better. At this point, there is enough oil in the valve lifter so that the valve does not ring.

Engine oil is very important for the engine. Engine oil is known as the blood of the engine. Without oil, the engine cannot function properly.

Engine oil not only plays the role of lubrication in the engine, but also plays the role of cleaning, sealing, buffering, rust prevention and heat dissipation.

The performance of the engine oil will be reduced after a long period of use, so it is necessary to change the oil regularly.

If the oil is not changed for a long time, it will also affect the normal operation of the engine.

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