Why did the clutch shoes melt?
The main reason for the clutch shoes melting to the inside of the clutch bell is the engine’s idle speed was too high. If you have to use your foot or a curb to stop the car when it’s supposed to idle, your idle speed is too high and the clutch shoes will melt eventually. When you have the brakes applied, the clutch shoes are still expanding and contacting the inside of the clutch bell. This contact (friction) creates heat, and although the clutch shoes are made from a heat-resistant plastic, the clutch shoes eventually melt into one solid mass and prevent the springs from bringing the clutch shoes into their normal position.
