(1) Causes of abnormal noise in the motor belt
1. Misunderstanding: Many people think the belt is too tight or too loose. In fact, these are superficial phenomena and it is impossible. to adjust the tensioner. Solve the essential problem.
2. The real reason: In winter, the car belt squeaks mainly because the weather is cold, the rubber hardens, loses elasticity, and the surface of the tensioner pulley and the rubber surface slip. Therefore, the reason is not that the belt is loose or tight, but that the rubber is too hard and the friction is reduced, causing slipping and friction causing abnormal noise.
(2) Disadvantages of abnormal engine noise:
Long-term slippage will easily cause the belt and tensioner to wear out. Eventually the belt will loosen and the bearing will become loose. get twisted, like just like old Santana, the entire engine was scrapped.
(3) Solution:
Apply polyol solution to the belt surface and moisturize it thoroughly to reduce hardening and freezing of the belt in winter, now thus a certain degree. Elasticity, reduces slipping. For a new car, one application is enough. If the belt is old, it should be applied continuously for 3 days.
Supplement: Polyol solution configuration
Glycerin solution or propylene glycol solution: the content is 66-77%, the further north, the higher the content high, but pure glycerol cannot be used, pure glycerin It is too hygroscopic and is not conducive to long-term hydration of the belt, and pure glycerin is too slippery. (Glycerin, propylene glycol reagent.)
How to use:
1. First diagnose if there is any abnormal noise in the belt: when idling, pour a little warm wateron the belt (not too much), if there is an abnormal noise. If the sound suddenly disappears, it's a belt problem.
2. When idling, use a cloth (preferably lint-free) to gently press on the belt and wipe it as clean as possible. ;
3. Fill the polyol solution into a small bottle (preferably a bottle with a small neck, or use a plastic syringe directly), let it drip onto the strip, until it is completely wet. .
4. Use a dry cloth (preferably lint-free), pour enough solution on it and gently press the belt to completely moisturize the entire belt.
Causes of abnormal noise in the engine belt
In most cases, abnormal noise in the belt is caused by a loose belt. When this happens, it is best to go to a repair shop to have the voltage adjusted.e the belt, 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 that the belt is usually loose or poor quality, so check the motor belt first. If there are many belts in the car, we cannot know which one is defective. We can startthe car and pour water on the belt. If the abnormal noise disappears, indicating that there is a problem with this belt, we can see if it is loose or of poor quality.
Abnormal noise coming from the motor 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 due to the fact thatThe joint 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 the vehicle is loaded, 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 andtwo 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 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 the visual elements that you think will work incould be the cause of 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 generators, 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 cotiming belt was installed 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 turns with difficulty 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 pulleyof the belt and the 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 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 repairsions at your 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.
What is the abnormal noise of the car belt?
It may be because the belt has slipped on the generator. There is strong friction and vibration between the belt and the belt. pulley, emitting a sound of a certain frequency.
The main cause of belt slippage is belt loosening or aging. Factors that can lead to belt loosening include improper belt tensioner adjustment or insufficient tensioner elasticity. The belt tensioner tension should be adjusted first. If that doesn't work, replace the tensioner.
AgingBelt mainly refers to the gradual hardening and loss of elasticity of the belt during long-term use, and the friction between the belt and the pulley is reduced.
In this case, the belt can only be replaced.
The existence of the most common abnormal noises in engines depends on the engine speed condition.
1. Abnormal noise only exists at idle or low speeds. The reasons for the noise include: too much clearance between the piston and the cylinder wall; too tight mounting of the piston pin or too tight mounting of the connecting rod bearing too much clearance between the pusher and its valve guide hole; cam profile; sometimes the starter latch is loose and the pulley is damaged (squealing visible when changing speeds).
2. The sound is chaotic when maintaining a certain speed, and short-term sounds follow one anothert during rapid deceleration. The reasons for the noise are: the camshaft timing gear is cracked or its fixing nut is loose; the crankshaft is broken; the axial play of the camshaft is too large or its bushing is loose;
3. Abnormal noise occurs when the engine accelerates quickly, and the sound still exists when the engine runs at high speed. The reasons for the noise are: The connecting rod bearing is loose, the bushing is burned, or the size does not match and rotates; the crankshaft bearing is loose or the bushing is burned;
How to judge the abnormal noise of the motor belt:
First of all, check the motor belt. If there are multiple belts in the car and you cannot determine which belt is the problem, you can start the car first and then pour water on the belt. If the abnormal noise disappears, it means there is a problem with thisstrap you. and you can check. Maybe it's loose or the quality is bad.
If the motor belt makes an abnormal noise, pouring water on it 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.