What is the reason for abnormal noise when stepping on the clutch?
2 Answers
The reason for abnormal noise when stepping on the clutch is the lack of lubricating oil in the clutch pedal return spring. The solution to this problem is to add lubricating oil to the spring. The car clutch is located in the flywheel housing between the engine and the transmission. The clutch assembly is fixed to the rear plane of the flywheel with screws, and the output shaft of the clutch is the input shaft of the transmission. During driving, the driver can step on or release the clutch pedal as needed to temporarily separate and gradually engage the engine and the transmission, thereby cutting off or transmitting the power input from the engine to the transmission. Currently, spring-loaded friction clutches (referred to as friction clutches) are widely used in automobiles.
I previously encountered clutch noise issues when driving a manual transmission, and later found out there could be several reasons for abnormal noises when pressing the clutch. A faulty clutch release bearing is the most common cause, producing squeaking or rustling sounds when depressed. Another possibility is an issue with the diaphragm spring of the clutch pressure plate, resulting in a clicking noise with each press. If the noise comes from the pedal itself, it might be due to lack of lubrication in the connecting mechanism's pivot pins—spraying some WD40 on those joints can help. Additionally, damage to the transmission input shaft bearing can cause a humming sound when pressing the clutch, requiring transmission removal for inspection. In short, following a troubleshooting sequence from simple to complex is crucial—first check around the pedal area before considering whether to remove the transmission.
