What are the causes and solutions for abnormal engine belt noise?

1 Answers
McArthur
07/30/25 8:29am
Here are the causes of abnormal engine belt noise: 1. Mostly caused by aging of various belt groups in the engine: or issues with the tensioner leading to overly loose belts, resulting in friction noise, belt slippage, etc. 2. Major belt groups and tensioners inside the engine: such as the engine timing belt, alternator belt, circulating water pump belt, air conditioning belt, power steering pump belt, etc. 3. Caused by the contact surfaces between the belt and pulley becoming too smooth. 4. When the engine speed changes rapidly. Here are methods to solve abnormal engine belt noise: 1. Check if the accessories driven by the belt have bearing damage, seizure, excessive play, or increased accessory power consumption. 2. Replace the belt, or lightly sand the contact surfaces between the pulley and belt with 100-grit sandpaper (light sanding is sufficient).
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