The impeller (one) is rotated by the crankshaft and it converts the mechanical Strength of the crankshaft into kinetic Power by putting the fluid in movement. The Charge of the oil stress inside the lock-up clutch is finished by two valves: the relay valve as well as the sign valve. https://garrettqqnkj.elbloglibre.com/33954561/details-fiction-and-torque-converter-clutch