When an abnormal noise occurs in a car engine, you must first determine the location where the abnormal noise occurs, and then diagnose the fault at that location. There are many sources of abnormal noises in automobile engines, such as abnormal belt noises, abnormal valve noises, cylinder knocking, etc. Abnormal noise coming from the belt is best to judge. As long as there is a chirping noise after starting the engine, then it is an abnormal noise coming from the belt. Abnormal belt noise is caused by belt slippage. The solution is very simple. All you need to do is replace the belt. The belt is a wearing part and must be replaced every 60,000 to 80,000 kilometers. Abnormal valve noise will appear on the engine and the valves are located under the engine valve cover. There are many reasons why abnormal noisevalve may be due to abnormal wear or poor lubrication. The knocking occurs in the middle of the engine. Cylinder knock is caused by excessive space between the piston and the cylinder wall. Knocking cylinder repairs are difficult and the most common solution is to bore out the cylinder and install a larger piston. When using a car, if the engine oil level is too low, add engine oil in time. Do not let the engine run at too high a speed when it has just been started and has not reached its normal operating temperature. On-time maintenance and on-time engine oil change When using engine oil, it is best to choose fully synthetic engine oil. Engine knocking and valve noises are caused by excessive wear and poor lubrication.
There is an abnormal noise in the Volkswagen engine, how to resolve it?
Hello, your situation is due to a belt that is too loose or aging. Check if the belt is too loose and tighten it. If it is old, it needs to be replaced. . I hope I can help you, I wish you a good car! If you have a problem with your car, ask the auto guru. Professional technicians from 4S stores can solve the problem within 10 minutes.
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What should I do if the car belt makes an abnormal noise?
A way to judge the abnormal noise of the engine belt
Step 1: If there is an abnormal noise in the engine compartment of the car, it means that the belt is usually loose or poor quality, so first of all check the engine belt. If there are many belts in the car, we cannot know which one is defective. You can start the car and pour water on itr the belt. If the abnormal noise disappears, there is a problem with the belt. We can see if it is loose or poor quality.
Abnormal noise coming from the engine belt. Water is poured in to increase its viscosity, which actually increases the viscosity of the belt. But once the water dries, the belt will return to its original shape. This is the principle of belt watering.
Step 2: We can also judge which belt has problem by listening to the sound. If there is a problem with the steering wheel, there may be a problem with the steering pump belt. If there is an abnormal noise when the car starts cold, there may be a problem with the engine belt, and we can check it step by step.
A method for determining and solving the problem of abnormal engine belt noise
1. The engine belt squeals.
This is because the joining surface betweenthe belt and pulley is relatively smooth. Typically occurs when engine RPM changes rapidly, sometimes with belt driven accessories. The load will increase and also cause the belt to idle.
A squeaky belt usually means that the coefficient of friction on the belt surface has been significantly reduced and the belt is excessively worn. If there is noise when loading the vehicle, you may want to observe one of the drive belts and notice that the resistance or elasticity of the automatic belt tensioner or tension wheel of the belt will increase abnormally.
Most automatic belt tensioners have a set of belt wear length indicators on the slider located between the bottom of the belt tensioner and the tensioner arm. The mark consists of a pointer and two or three marks indicatingthe working range of the belt tensioner. If the pointer is outside of this range, the belt may be overstretched and needs to be replaced. On cars without an automatic belt tensioner, use a standard belt tensioner gauge and measure halfway between the two pulleys. If it differs from the standard value, it is better to replace the belt.
2. The motor belt makes a long-term squealing or high-pitched noise
Although the surface of the pulley is stained with sand and other dirt or the worn belt is installed upside down, the The belt will make a long-term high-pitched noise or squeal, but this is usually caused by poorly assembled auxiliary devices.
If the noise occurs in a new car that has not been driven for a long time, it may be caused by poor quality of the original equipment. Check for visual features that you think might be causing the dysfonoperation. If the above noise occurs in an old car, then you must consider whether you need to completely replace some of the associated accessories of its auxiliary drive unit. Carefully examine accessories that could have been delicately replaced (such as generator sets, auxiliary steering pumps, etc.). ) and check if their mounting brackets are secure, which can also cause misalignment of the pulley assembly.
Dust or sand between the pulleys and pulleys can also cause loud noises, so if the car is used in a dirty environment, check the surfaces of all pulleys for dust.
Take the example of the timing belt. It must be adjusted immediately after installation. This is why the direction of rotation of the timing belt must be marked. If the timing belt was installedWorn backwards during another service, you will hear a high-pitched squealing sound when the belt is running.
Try reversing the direction of installation of the belt to see if the fault disappears.
3. The motor belt makes a whistling, clicking, roaring, or chirping sound.
A persistent whistling or clicking sound that increases with engine speed usually means that the auxiliary rotating mechanism bearings are starved of oil.
Using a stethoscope, we can hear these noises more. Next, remove the drive belt and turn the suspected defective part by hand. If it is difficult to turn or the noise is rough or crackling, do not hesitate to replace the bearings or corresponding parts. However, it should be noted that whenever you replace parts of the auxiliary transmission accessories, remember to replace the elastic belt pulley and the deviceautomatic elastic.
As the engine speed increases, the continuous roar gradually turns into a whine, indicating that the corresponding bearing will soon fail.
4. The rumble of the motor belt
The rumble is caused by the beltTypical sound caused by vibration, especially when the auxiliary mechanism transmission system is running, the noise will increase significantly when the motor reaches a certain speed. The cause of this failure is usually that the drive belt is too loose, too tight, or the belt tensioner and elastic pulley are damaged.
If the car engine belt is abnormal during the warranty period, it is recommended to contact the 4S store as soon as possible to negotiate repairs. Once the warranty expires, you may have to pay for repairs at your own expense. The belts mmotor are automotive wear products and must be replaced regularly. Replacing the engine belt on some models is very complicated. It is better for car owners to go to a repair shop or 4S workshop for replacement.
Most abnormal belt noises on Pacific Automotive Network are due to the belt being loose. If this happens, it is better to go to the repair shop to adjust the belt tension, because. the belt will make a squealing sound if it slips. Once the belt slips, the belt will be further stretched due to friction and high temperature, making the slipping more serious and entering a vicious circle. Therefore, quick adjustment of belt tension is essential.
Most of the time, when the belt makes an abnormal noise, it is because it is loose. In this case, it is preferredIt is safe to go to the repair shop to adjust the belt tension, because the belt will produce noise. a squeak if it slips. Once the belt slips, it will cause the friction temperature to be further stretched and slip more seriously, entering a vicious circle. Therefore, quick adjustment of belt tension is essential. If you have driven almost 20,000 kilometers and have never changed the belt before, you should normally replace the belt now. Don't wait for the belt to break before replacing it and you'll be in big trouble.
How to judge the abnormal noise of the engine belt: Step
First: If there is an abnormal noise in the engine compartment of the car, it is usually because the belt is loose or of poor quality. You must therefore first check the engine belt. If there are several belts in the car and we cannot detectTo determine which belt is the problem, we can start the car first, then pour water on the belt. If the abnormal noise disappears, there is a problem with this belt. , and we will. You will be able to check if it is loose or of poor quality.
The motor belt makes an abnormal noise. Dousing it with water will increase its viscosity, which effectively improves the viscosity of the belt. But after the water dries, the belt will return to its original state. This is the principle of belt watering.
Step
Second: We can also determine which belt has the problem by listening to the sound. If there is an abnormal noise when the air conditioner is turned on, there may be a problem with the air conditioner compressor belt. If there is a problem with the steering wheel turning, there may be a problem with the power steering pump belt. If the car makes abnormal noises when startingcold, there may be a problem with the engine belt. We can check it step by step.
Diagnosis and solutions to abnormal engine belt noise faults: The engine belt squeaks: This is due to relatively gentle wear of the friction between the belt and the pulley. This usually happens when the engine speed changes quickly. Sometimes the increased load on belt-driven accessories also causes belt noise. If the belt makes a squealing noise, it usually means that the friction coefficient of the belt surface has been significantly reduced and the belt is excessively worn. If the vehicle is loading If the machine is making noise while loading, you may want to observe one of the drive belts. You will find that the strength or elasticity of the automatic belt tensioning device or the belt elastic wheel will increase abnormally.aly.
Most automatic belt tensioners have a set of belt wear length indicators somewhere between the bottom and arm of the tensioner, along the slide. The mark consists of a pointer and two to three marks that indicate the operating range of the belt tensioner. If the pointer is outside this range, the belt is probably too tight and needs to be replaced. On vehicles without an automatic belt tensioner, use a standard belt elongation tape measure halfway between the two pulleys. If there is a difference from the standard value, it is best to replace the belt.
Long squealing or squealing of the engine belt: Although the surface of the pulley is stained with dirt such as sand or the worn belt is installed backwards, this will also cause squealing or squealing noises from the belt. . This is ggenerally due to incorrect assembly of the auxiliary device. If the noise occurs in a new car that has been on the road for a while, it may be caused by poor quality original equipment.