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Why does the transmission make abnormal noise that disappears when the clutch is pressed?

2 Answers

OscarRose

07/29/25 2:34pm

The reason why the transmission makes abnormal noise that disappears when the clutch is pressed is: After the clutch is pressed, the power between the engine and the transmission is cut off, and the transmission stops rotating, so the abnormal noise disappears. In this case, it is necessary to check whether the transmission gear oil is missing or deteriorated. The transmission is a mechanism used to change the speed and torque from the engine. It can fix or change the transmission ratio of the output shaft and the input shaft in different gears. The transmission consists of two parts: the transmission mechanism and the shifting mechanism. The main function of the transmission mechanism is to change the value and direction of torque and speed, while the main function of the shifting mechanism is to control the transmission mechanism to achieve the transformation of the transmission ratio, that is, to achieve gear shifting for speed and torque change.

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McEmmanuel

08/13/25 6:56am

Last time I was driving, the transmission made a strange clicking noise while moving, but as soon as I pressed the clutch pedal, the sound completely disappeared. This really puzzled me. After spending some time researching, I learned that this is usually a problem with the input shaft bearing of the transmission. When the vehicle is in neutral or accelerating, the input shaft rotates at high speed, and if the bearing is worn, it will produce abnormal noises. However, once the clutch is pressed, the connection between the transmission and the engine is disengaged, reducing the pressure on the bearing, so the sound naturally stops. If left unrepaired for a long time, the bearing may completely fail, leading to transmission lock-up or more expensive repairs. I now suggest not driving too fast and finding a repair shop to have a mechanic listen to the location of the noise. Also, check the transmission fluid level to ensure it's normal, and change the oil when necessary to prevent small issues from turning into big troubles.

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