Oil pump
The oil pump takes oil from the sump and delivers it under pressure to various parts of the engine. An oil receiver with a strainer is installed in front of the oil pump inlet pipe, and is designed to trap contaminants. The oil pump has gears (rotors) with internal gearing, located in the pump casing.
pressure reducing valve (oil pressure regulator) At high engine speeds, the oil pump is able to supply significantly more oil than is required to lubricate the rubbing parts. A relief valve is installed to prevent this (oil pressure regulator), to avoid over-supply of oil. If the oil supply is sufficient, then the spring of the oil pressure regulator closes its valve and closes the bypass channel. But when the oil is over-supplyed, the pressure it develops overcomes the pressure of the spring force. The valve opens and excess oil flows through the bypass channel into the sump.
Oil filter
The oil filter is a full-flow type with a paper filter element and a built-in bypass valve.
The filter is mounted on the outside of the engine to make it easier to replace the filter element. A bypass valve is installed upstream of the filter element to relieve oil pressure in the event of a clogged filter element.