Engine Lubrication: Description and Operation

Function of revised oil circulation






Intake Side

Oil is taken in from the oil pump -6- via the oil pick-up pipe -8-.

Pressure Side

Oil pressure comes from the oil pump -6-through the upper part of the oil pan past the pressure relief valve -7-, oil pressure switch -9-, oil cooler -2- and oil filter -1- to the pressure relief valve -4-.
Pressure relief valve -4- controls the oil pressure to the engine.
The pressure relief valve -7- is a safety valve that opens only at high RPM and cold engine temperature.

Advantages

Oil pressure is controlled from the oil filter and oil cooler, so that the oil pressure available at those locations is supplied via the pressure relief valve -4- or from the oil pump.