Lubrication System
The oil pump (1) supplies engine oil from the oil pan (4) and feeds it to the various parts of the engine under pressure.
An oil strainer is mounted before the inlet of the oil pump to remove impurities that could clog or damage the oil pump or other engine components. When the crankshaft rotates, the oil pump driven gear rotates. It makes the space between inner rotor and outer rotor to constantly open and narrow enough to pull the oil from the pan into the main gallery of block.
At high engine speeds, the oil pump supplies a much higher amount of oil than required for lubrication pressure of the engine. A relief valve relieves the amount of oil entering the engine lubrication passages.
During lower engine speeds the relief valve is closed by the coil spring tension, so all of the oil is delivered to the engine parts. If the engine speed is increased, the oil pressure becomes high enough to overcome and open the force of the spring. The bypassed oil is returned to oil pump inlet.
For cooling the engine oil, the heat oil cooler (5) is located on the engine block side.