What Causes a Clutch Not to Disengage?

[FrankFitz]

If the clutch is not disengaging, you can first check the free travel of the clutch pedal, inspect whether the pressure plate is reversed, and verify if the inner ends of the release levers are aligned. Below is an introduction to the clutch: Concept: The clutch is located inside the flywheel housing between the engine and the transmission. The clutch assembly is secured to the rear plane of the flywheel with screws, and the output shaft of the clutch serves as the input shaft of the transmission. Three Operating States: The clutch operates in three states: disengaged when the clutch pedal is depressed, fully engaged when the clutch pedal is not depressed, and partially engaged (semi-engaged) when the clutch pedal is partially depressed. When starting the vehicle, the driver depresses the clutch pedal, causing the pressure plate to move backward and separate from the friction disc. At this point, the pressure plate and flywheel are not in contact, eliminating relative friction. During normal driving, the pressure plate tightly presses against the flywheel's friction disc, creating maximum friction between the pressure plate and the friction disc. This maintains relative static friction between the input and output shafts, ensuring they rotate at the same speed.