In a clutch with coil spring how will the axial clamping load vary wear of facing?

As the facing wears, the axial clamping load in a clutch with a coil spring will decrease. This is because the coil spring provides the force that presses the pressure plate against the friction disc, and as the facing wears, the distance between the pressure plate and the friction disc increases. This means that the coil spring has to stretch more to provide the same clamping force, and as a result, the axial clamping load decreases.

The rate at which the axial clamping load decreases will depend on the rate at which the facing wears. If the facing wears quickly, then the axial clamping load will decrease quickly. If the facing wears slowly, then the axial clamping load will decrease slowly.

It is important to maintain the proper axial clamping load in a clutch to ensure that the clutch functions properly. If the axial clamping load is too low, then the clutch may slip, and if the axial clamping load is too high, then the clutch may drag.