The drawing of the oilrouting system in the crankcase shows the direction of the oil flowing through the pump and right crankcase. The big red T stands for the steel ball that closes the pump off when the engine is not running, and keeps oil flowing back from the oil tank. This ball opens up when the engine starts running and pressure is created by the pump, the oil is then flowing to the tappets and top end. When there is enough pressure there, the other valve (big red B) opens up and oil is flowing to the big end (con rod bearings and pen). In this valve the B.E.O.F.V.C (big end oil flow valve check) can be placed.