What is the reason for the clunking sound when releasing the clutch during manual transmission gear shifting?
2 Answers
The reasons for the clunking sound when releasing the clutch during manual transmission gear shifting are: 1. Abnormal noise occurs when the clutch is disengaged or engaged; 2. The release bearing lacks lubricant, causing dry friction or bearing damage; 3. Severe oil contamination or dust accumulation between the release bearing sleeve and the guide tube, or fatigue, breakage, or detachment of the release bearing return spring and pedal return spring; 4. Loose fit between the spline hole of the driven plate and its spline shaft; 5. Annealing, fatigue, or breakage of the driven plate damping spring. A manual transmission is a gear-shifting device used to change the speed and torque transmitted from the engine to the drive wheels. It enables the vehicle to obtain different traction forces and speeds under various operating conditions such as starting from a standstill, climbing hills, turning corners, and accelerating, while also allowing the engine to operate within a more favorable range of working conditions.
Having driven manual transmission cars for over twenty years, these kinds of clunking sounds are not uncommon, often signaling worn clutch plates or synchronizer issues. I've driven many older cars and noticed that if you release the clutch too quickly during gear shifts, it can cause gear collisions and produce noise. Another common cause is aged or insufficient gear oil, leading to inadequate lubrication. If this happens frequently, it may accelerate internal transmission damage, even causing shifting difficulties or jerking. Some cars may produce similar sounds when engine mounts are loose, with increased body shake amplifying the vibrations. It's advisable to regularly check clutch wear and replace components when necessary—don't skimp on costs to save money, as repairs could end up being more expensive and troublesome. Pay attention to shifting rhythm during normal driving, ensuring engine RPM matches vehicle speed. Developing smooth operation habits can help reduce such issues.
