That powerful, smooth ride that you have enjoyed for so long with your Jaguar is no more, thanks to your deteriorating Jaguar clutch. When your Jaguar clutch begins to fail, the most common complaints center around the noise and tumult that a worn-out clutch creates when shifting gears. You might struggle to release the clutch, or notice slipping, 'chattering,' or hideous screeching. Sometimes the car will flat out refuse to move at all when the Jaguar clutch is dying. Before the noise begins, there might have been some early signs that the Jaguar clutch is failing: poor gas mileage. When you go up hills, you need to downshift more often. When you accelerate or start moving from a stop, the engine sounds like it is revving up. There's no more pedal 'free play' when you adjust the clutch, and the clutch pedal feels stiff and is harder to press down. These are signs that the components of your Jaguar clutch - the flywheel, disc and pressure plate - have been worn down by the constant high heat and friction. The Jaguar clutch works to help the engine's spinning parts engage - or disengage - with the turning wheels. The clutch acts to join or disconnect the transmission from the car's wheels, and is activated by the pressure of your foot on the pedal. That pressure pushes the pressure plate against the disc, which then presses against the flywheel. Eventually, the friction will wear down the friction materials, until the surface is too thin to transmit enough torque to move the car normally. At that point, order a new Jaguar clutch, and enjoy the challenge of installing one in your luxury import car.