Clutch
A mechanical coupling that connects and disconnects the engine's power from the manual transmission.
A clutch is a mechanical device that connects and disconnects the engine's power flow from the transmission. In manual transmission vehicles, the clutch allows the driver to temporarily interrupt power delivery to shift gears or stop the vehicle without stalling the engine.
The clutch assembly consists of three main parts: the **flywheel** (bolted to the engine), the **clutch disc** (a steel plate coated with high-friction material on both sides, splined to the transmission input shaft), and the **pressure plate** (a spring-loaded cover bolted to the flywheel that clamps the clutch disc against the flywheel).
When the driver presses the clutch pedal, a hydraulic release bearing pushes against the pressure plate springs, releasing the clamping force and allowing the clutch disc to spin independently of the flywheel (disengaged). When the pedal is released, the springs clamp the disc, forcing it to spin at engine speed (engaged).
Clutches are wear items. Friction material gradually wears down, especially from "riding" the clutch or hard acceleration. A worn clutch will begin to slip, meaning the engine revs up but the vehicle does not accelerate. Other symptoms include a hard clutch pedal, grinding noises when shifting, or a burning smell.