What Causes Abnormal Noise in Car Engine Belts?

1 Answers
MilaDella
07/29/25 12:59pm
The causes of abnormal noise in engine belts are: 1. The contact surface between the belt and pulley becomes overly smooth; 2. Loose or aged drive belts; 3. Excessive load on driven accessories; 4. Insufficient oil supply leading to inadequate lubrication of timing chains; 5. Excessive wear reducing the belt's surface friction coefficient; 6. Contaminants on pulley surfaces; 7. Incorrect reverse installation of used belts. Methods to diagnose engine belt noise: 1. Inspection: First examine the engine belt. For vehicles with multiple belts, start the engine and pour water on suspected belts - if noise disappears, this identifies the faulty belt for further inspection of looseness or poor quality. 2. Water application: Pouring water temporarily increases belt viscosity to pinpoint noise sources. The belt returns to original state after drying, which explains this diagnostic principle.
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