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Why Does the Engine Belt of a Car Make Abnormal Noises?

1 Answers

DeAlexis

07/29/25 11:56pm

Belt abnormal noises may be caused by slipping, aging, friction, and other factors. Insufficient Belt Tension: Actually, when the belt tension is insufficient, the belt can easily slip just like when it ages. Most cars on the market today use belts with automatic tension adjustment, which relies on a large spring design to press the belt, thereby regulating the belt tension. When the belt is too loose, the friction decreases, leading to abnormal noises due to slipping. Aging of the Drive Belt: The drive belt is primarily made of rubber, which hardens and becomes brittle over time with prolonged use, and its friction coefficient also decreases. In other words, as the rubber of the belt ages, the friction is not as good as before, which affects power transmission and leads to slipping. After slipping for a while, the rubber softens due to the heat generated by friction, and the noise disappears. Severe Belt Wear: When the car's belt is severely worn, the contact area between the belt and the pulley significantly decreases. At this point, even a slight pressure on the belt will cause it to sink deeply into the pulley groove. When the belt rotates, it becomes very laborious, and the friction increases significantly. In such cases, it is necessary to replace the belt with a new one as soon as possible.

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