DESCRIPTION OF COMPONENTSENGINE OIL PUMPThe engine oil is drawn in by the sump by means of the vacuum created by the rotation of the gears on the crankshaft. There is a vacuum from the partition (2) for the gears as far as the oil sump suction head. Pressure builds up in all engine oil supply ducts (4) starting from separation partition (2). When the pressure exceeds 5 bar, the force exerted on the restricter valve (5) overcomes the reaction of the spring underneath and moves the valve until the connecting duct between the pressure chamber (3) and the low pressure chamber (1) opens. 
1 - Low pressure chamber 2 - Partition 3 - Pressure chamber 4 - Oil supply duct 5 - Oil pressure restricter valve Engine oil pressure restricter valve closed operating position 
Restricter valve short circuit operating position 
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