1. The timing belt will become loose after being used for a period of time. When the timing belt cannot fully fit the gear, a serious howling sound will occur when the cold engine is started. If there is abnormal noise in the belt, we can try to solve it by adjusting the tensioner or replacing the belt. When the engine runs smoothly, this abnormal noise will disappear automatically. In fact, this is not a major problem. You only need to replace the aging timing belt regularly to avoid this problem to a large extent.
2. It may be that the belt is slipping on the generator, causing severe friction and vibration between the belt and the pulley, making a sound of a certain frequency. Use polyol solution to coat the land breeze to maintain a certain elasticity and reduce slipping. Only one application is enough for a new car. If the belt is older, it needs to be applied continuously for 3 days.
3. The belt drive accessory is affected by other hardware. For example, if the bearing is damaged or stuck, the power of the belt drive accessory will increase, and the belt will work excessively. If the belt remains in this condition for a long time, the power of the belt drive accessory will increase. Lifespan will be affected.
4. It may be caused by the reduced friction coefficient of the belt surface and excessive wear of the belt. The owner needs to check and replace it in time. If the noise is made when the vehicle is loaded, the owner can observe one of the sets of transmission belts. , through observation, it can be found that there is an abnormality in the automatic belt tensioner. There is usually a belt wear length indicator mark at the bottom of the automatic belt tensioner. If the pointer exceeds the range, it means that the belt has been worn excessively, and the car owner needs to replace it in time to avoid More failures occur while driving, affecting driving safety.
How to judge abnormal belt noise:
You can judge which belt has a problem by listening to the sound. For example, it may be a problem with the air-conditioning compressor belt. If the problem occurs when the car is started cold Abnormal noise may be caused by a problem with the engine belt. This method can also roughly determine the abnormality of the belt.
That may be caused by the high-pressure oil pump being clogged by impurities and moisture in the oil, causing corrosion and early wear and tear. In the end, the car cannot be started, and the oil pump must be replaced to solve the problem;
It is more expensive to buy the oil pump yourself, but if there is a quality problem, you can ask the repair station to make a claim.
I hope the poster can find a solution soon.