Oil Pump including Pump Assy., Oil Gasket, Oil Pump Body ,Crankcase, Oil Pump , Cover, Pump Oil .Rotor, Oil Pump Inner ,Rotor, Oil Pump Outer,Shaft, Oil Pump,Pivot, Oil Pump Screen, Oil Filter Screw, Pan,.a part of the lubrication system that pressurizes motor oil for distribution around the engine.The oil pump in an internal combustion engine circulates engine oil under pressure to the rotating bearings, the sliding pistons and the camshaft of the engine. This lubricates the bearings, allows the use of higher-capacity fluid bearings and also assists in cooling the engine. As well as its primary purpose for lubrication, pressurized oil is increasingly used as a hydraulic fluid to power small actuators. One of the first notable uses in this way was for hydraulic tappets in camshaft and valve actuation. Increasingly common recent uses may include the tensioner for a timing belt or variators for variable valve timing systems.