The determine displays the vacuum clutch system. This kind of clutch utilizes the prevailing vacuum during the motor manifold to work the clutch. The vacuum clutch contains a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  Always location the flat facet in the clutch plate against the motor. https://clutch-kereta58900.humor-blog.com/32040978/how-clutch-kereta-can-save-you-time-stress-and-money