What Causes the Buzzing Sound After Replacing the Timing Belt?
2 Answers
Replacing the timing belt and hearing a buzzing sound is usually due to the timing belt being installed too tightly, which needs to be addressed promptly to avoid causing other faults and losses. Additionally, a new belt that is overly tight may also produce noise during transmission, which is a normal phenomenon. Under normal circumstances, as long as the operation is smooth, the timing belt will loosen, and the abnormal noise will disappear after a certain mileage of running-in. When replacing the timing belt, adjusting the belt's tightness is crucial. If it's too tight, it can cause excessive tension and make the belt prone to breakage, affecting its lifespan. If the belt is too loose, it can easily slip, leading to misaligned timing, resulting in car shaking, inability to accelerate, insufficient power, increased fuel consumption, and other phenomena.
Hey, I've encountered this situation before - a humming noise after replacing the timing belt, which is mostly caused by installation issues. If the belt tension isn't adjusted properly, being too tight is like plucking a guitar string, creating that humming sound; too loose and it slips, which also causes noise. Another common reason is the belt not being properly aligned with the teeth - if it's installed crooked, it'll create friction and noise when running. It could also be that the tensioner or idler pulley is old and worn out, and wasn't checked when replacing the belt, causing unbalanced rotation and strange noises. From my experience, it's best to go back to the shop for a check-up right after replacement, listening to the sound to judge the position. If you keep driving like this, severe wear can cause the belt to break, damaging the engine valves, which would be costly and time-consuming. Regular checks are essential - generally, replace the belt every 50,000 kilometers to prevent these headaches and ensure smooth, safe driving.
