Why is the clutch stiff?

[McDonovan]

Clutch stiffness is most likely caused by a broken or jammed return spring in the clutch master cylinder. Here is some relevant information about the clutch: Clutch: 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 is the input shaft of the transmission. While driving, the driver can press or release the clutch pedal as needed to temporarily disconnect or gradually engage the engine and transmission, thereby cutting off or transmitting the power from the engine to the transmission. Principle of releasing the clutch: The principle of releasing the clutch is: "slow at first, fast in the middle, and coordinated at the end." When initially pressing down, it should be done quickly and all the way to the bottom. When lifting the pedal, the free travel should be quick, but slow when nearing contact. At the semi-engagement point, pause briefly before releasing completely. The key to this process is finding the semi-engagement point accurately. To control the vehicle speed effectively, use the semi-engagement point as the dividing line—lifting quickly above it and lowering slowly below it, adjusting to find a speed that suits you.