MEANING OF OIL PUMP
The oil pump is an internal combustion engine part that 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.
Most oil pumps are driven directly by the crankshaft. The pump illustrated here sits over the nose of the crankshaft where its internal gear is driven directly. All oil pumps are called positive displacement pumps – the amount of oil that leaves is the same as that enters. In other words, the pump moves oil from one side, to the other.
This can be contrasted with a coolant pump, for example, which tries to move water but will not do so if the pressure is too great on one side. As engine RPM increases, the pump turns faster and more oil is pumped. This is convenient because at higher engine speeds lubrication and cooling requires a greater flow of oil.
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