Why does the car shake severely when engaging the clutch halfway in first gear?

[DiAshlyn]

Severe shaking when engaging the clutch halfway in first gear may be caused by the following situations: 1. Possible causes: The clutch disc might be uneven or deformed, requiring special inspection. Improper clutch adjustment - the clutch must be adjusted to a moderate position, neither too high nor too low. Issues with universal joint bearings - if bearings show severe fatigue spalling, oxidative rust, wear pits, cracks, hardness reduced to HRC<60, or unadjustable excessive noise, they should be replaced promptly. 2. Basic requirements: Ensure transmission of the engine's maximum torque with some torque transmission margin. Achieve complete separation when disengaged and smooth engagement when coupled, with good heat dissipation capability. Keep the rotational inertia of the driven parts as small as possible. This makes it easier to change the speed of parts connected to the transmission input shaft when disengaging the clutch to shift gears, thereby reducing gear impact.