The figure demonstrates the vacuum clutch mechanism. Such a clutch utilizes the existing vacuum during the motor manifold to operate the clutch. The vacuum clutch contains a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  Along with your car idling, pay attention for just a growling sound with https://clutchkereta82580.blogmazing.com/32228329/new-step-by-step-map-for-clutch-plate