In most cases, abnormal belt noise is caused by a loose belt. When this happens, it is best to go to a repair shop to have the belt tension adjusted, as the belt will slip and squeal. Once the belt slips, it will extend further due to high friction and the slippage will become more serious, leading to a vicious cycle. 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 change it now. Don't wait until the belt breaks before replacing it or you'll be in big trouble.
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 thate belt is usually loose or of 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 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 cmotor 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 between the belt and the pulley is relatively smooth. This usually happens when the engine speed changes quickly. Sometimes the load on belt-driven accessories increases, which can 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.
TheMost 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 indicating the 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 devicespoorly assembled auxiliaries.
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. examineA visual component that you think could be causing the malfunction. 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 for dusts of all pulleys.
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 installed backwards during other maintenance, 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 hesitateDo not replace bearings or related parts. However, it should be noted that whenever you replace parts of the auxiliary transmission accessories, remember to replace the belt elastic pulley and automatic elastic device.
As the engine speed increases, the continuous roar gradually turns into a whine, indicating that the corresponding bearing will soon fail.
4. Engine Belt Rumble
Rumble is a typical noise caused by belt vibration, especially when the auxiliary mechanism transmission system is running and when the engine reaches a certain speed, the noise will increase considerably. 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 engine beltthe car is abnormal during the warranty period, it is recommended to communicate with 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. Engine belts 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.
You will hear a crackling sound coming from the bottom of the car when first starting. This is normal and there is a high probability that it is an engine belt
Then turn it. Note that the operation must be carried out when the engine is cold. ThereThe twist angle should generally be less than 90 degrees, otherwise it will need to be adjusted. Abnormal noise in the engine belt is caused by the belt being too dirty. Cleaning it with water or lubricating it with a little lubricant can also eliminate the abnormal noise.
Solution
If the crackling sound occasionally comes from the engine compartment, open the front hood and carefully check for foreign objects. Sometimes blocking foreign objects will cause the vehicle to squeal, therefore. be sure to check it carefully and make it a habit to check the engine compartment frequently.
If the vehicle makes a screeching sound as soon as the brakes are applied while the vehicle is moving, this means that the brake pads have worn to the limit and have started to grind all the way to the brake rotor . time, you should go to the repair shop for maintenance as soon as possible.