Is there a friction sound on the pulley? You should think about this!
On a weekend morning not long ago, my friend called me and said that after changing the pulley, his car would make a "squeak" sound every time it started. The sound disappeared not long after the beginning. Then he asked me if his pulley was not replaced correctly. I know that encountering this strange noise can make people nervous. However, the installation error when replacing the pulley is only one of the reasons for the abnormal noise. Not all, that is to say, the strange sound does not mean that you have made an operating error when replacing the pulley. Even if the best auto mechanic in the world replaces the pulley for you, it is normal for the pulley to make noise, because if the friction surface of the new belt and the old pulley is not enough, they will make noise when working. As the work of the pulley becomes looser, the working condition of the contact surface will get better and better. This principle is the same as why a new car has a run-in period. You need to replace it. After the pulley, regularly check the working status of the belt, and then adjust accordingly according to the actual situation. Even if it is used repeatedly and adjusted two or three times, it is normal. This is determined by the characteristics of the multi-groove belt.
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