What is the reason for the clattering of the engine

<>1. Generally, under normal circumstances, it is the sound of the valve or camshaft, why is there a valve sound, because when the engine is running, the intake valve and the exhaust valve will be opened alternately, the intake valve is opened to inhale the combustible gas mixture, so as to facilitate the combustion in the cylinder to promote the engine to run, the exhaust valve is opened to discharge the exhaust gas produced after the combustion of the mixture, 2. The structure of the valve is attached to the combustion chamber to play a sealing role, and the cylinder and valve are metal. The separation and fitting of the two pieces of iron from time to time will inevitably produce a collision sound; As for why there is a sound in the cam, it is also because of the structure, generally the cam is there with a friend called the rocker, and there is also a gap between them, and when the engine is working, they will also go back and forth slightly similar to the collision, which is also two iron bumps, and there may also be that sound.

Piston knocking refers to the piston swinging or channeling in the cylinder when it moves up and down, and its head or skirt collides with the cylinder wall and cylinder head to produce abnormal sound, which can be divided into cold knocking cylinder, hot knocking cylinder and cold and hot knocking cylinder.

Fault phenomenon. 1.There is a knocking sound at low temperatures, and the sound weakens or disappears when the engine temperature is normal.

2.When idling or low speed, a clear and rhythmic "click" sound is made, and the sound weakens or disappears when the speed is increased3. After the fire of a cylinder is broken, the abnormal sound weakens or disappears, and the spark plug jumps out of fire once and sounds twice.

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.

Not on the oil, how much the oil pressure, or valve tappet pressure.

The engine has a "click" sound, is it a big fault? The old mechanic patiently made it clear!

There is a clattering sound in the engine, which may be caused by the following reasons:

1. Abnormal noise of engine belts, such as generator belts, air conditioning belts, steering pump belts, etc., may be too loose or too tight, or it may be that the belt is aging, adjust the tightness of the belt, apply butter to the belt, or replace the belt.

2. The engine lacks cylinders, a cylinder does not work, the engine will be unbalanced and produce abnormal noise, and it is also accompanied by the violent shaking of the engine, insufficient power and other faults, which may be the fault of the ignition module, spark plug and fuel injector, and the corresponding accessories can be replaced.

3. Engine "tempering" failure. When the car slows down and collects the oil, there is a "poof" sound, which may be the engine "tempering" failure, which is usually called the engine "fire", too much carbon deposition on the valve or the wrong timing of the valve will produce abnormal noise, cleaning the carbon deposit on the valve or adjusting the timing of the valve.

First of all, this "da-da-da" abnormal sound is the moment it is activated. Or is there idle time after starting?

If there is an abnormal sound when starting instantaneously, there will be no abnormal sound when the engine is started. It is likely that the carbon brush inside the starter motor is faulty. The working principle of the starting motor is that after the electromagnet is energized, the gear of the starting motor and the flywheel of the engine are combined and rotated at the same time, so that the engine can be driven to start, and the gear will quickly return to position after the engine starts.

This fault is due to the abnormal sound caused by the gear of the starter motor not returning to position quickly, so it is necessary to check the starter motor.

If there is an abnormal idle sound after the engine is started, this fault point is likely to be caused by the hydraulic support inside the engine cylinder head and the excessive clearance of the valve. Because the vehicle has more kilometers and the years of use will be longer, the engine valve and hydraulic support will have a certain amount of wear. After the gap is too large, there will be a "click" abnormal sound.

To solve this problem, the cylinder head needs to be disassembled to replace these 2 parts.

When the car idles, it makes a "click" sound, is it a fault? Listen to the mechanic!

Engine rattling is generally caused by excessive valve clearance. The hydraulic top is simply to check the oil level and oil pressure first, if it is a manual adjustment, only need to re-adjust.

Hello friend, it was a slight dry friction sound caused by incomplete lubrication of the hydraulic tappet compensation hole!

Hello, if it's a crisp da-da-da, this one is a valve sound.

Low oil pressure and large valve clearance!

Hello, this is the sound of the valve.

1. Abnormal sound of cold start.

Many car owners will hear the abnormal sound of "da-da" in the engine compartment when the car starts cold, in fact, this "da-da" abnormal sound is caused by the oil pump not fully establishing the oil pressure during the cold start, resulting in the lack of lubrication of various components. Under normal circumstances, when the engine has been running for a period of time, the rattling noise will disappear.

2. The carbon canister solenoid valve is working with abnormal noise.

The function of the solenoid valve of the carbon canister is that when the engine starts, the solenoid valve installed between the canister and the intake manifold is opened, and the gasoline vapor adsorbed in the canister is brought into the cylinder together with air to participate in combustion. This not only reduces emissions, but also reduces fuel consumption. This part also makes a clicking sound during operation.

The above two are normal engine clattering sounds, so the clatter sound of the car's cold start is not always a failure, and there will be no hidden danger of overhauling the engine.

3. The foot glue is aging or loose.

The foot glue 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 have the effect of fixing the engine.

Once these foot glue are aged or loose, the engine will shake, and in serious cases, there will be a "click" abnormal sound, which only needs to be replaced with a new foot glue.

The reason for the excessive sound of the car engine "da-da" needs to focus on the following aspects:

1. Many new car owners will suspect that the car engine has abnormal noise when they open the front cover when the car is idling after the first warranty inspection service is returned (because before going to maintenance, they are operating in the cab of the car, and they can't hear the sound of the engine under the front cover when it is normal operational. At present, this sound is heard because in the situation of idling and opening the front cover to find the engine sound, it is natural to hear the sound of the engine operating normally. If you can't hear it in the car, it's not too loud, it's usually 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, but it is different from the clicking sound, there is a Gragra sound.

2. When the general car starts cold, the engine sound will be slightly louder than that of the hot car, 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.

3. The reason for 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.

4. If you are still not at ease through the above investigation, it is recommended to go to the nearest 4S or auto repair shop to check to confirm the cause of the failure.

What is the problem with the "click" sound when the car idles?

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 engine rattling sound may be the sound of the high-pressure oil pump, or it may be the sound of the camshaft and valve tappet with too much valve clearance. Many cars are using in-cylinder direct injection technology, and in-cylinder direct injection engines have high-pressure oil pumps, and the high-pressure oil pumps are in the engine compartment. The direct injection engine must have a high-pressure oil pump, because the injection pressure of the direct injection engine is relatively large, and this injection method can completely atomize the gasoline.

Thoroughly atomize.

Hello, this is not possible to determine the fault just by listening to the sound, it is recommended that you go to a professional experiment for maintenance, generally if this sound appears, it may be the sound of the valve. Hope it helps you the more.