The determine shows the vacuum clutch mechanism. This sort of clutch employs the present vacuum during the motor manifold to function the clutch. The vacuum clutch is made of a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  This prevents the transmission shaft and clutch plate from tilting https://clutch-plate59246.madmouseblog.com/13503507/new-step-by-step-map-for-clutch-kereta