928 S V8-4957cc 5.0L (1985)
Engine Oil Check Valve: Diagrams
Oil Circuit Diagram
The oil delivered by the oil pump goes first to the pressure relief valve (3). The pressure relief valve will open when a pressure of 8 bar is reached. The
excessive oil will return into the suction side of the pump. The oil required for lubrication continues to the thermostat (5), on which the oil pressure
sending unit (7) is located.
If the oil is cold, the thermostat will be open (position illustrated). The oil flows around the expansion element and through the oil filter to the main
passage (9). In this condition the feed opening "k" and the return opening "r" of the oil cooler will have the same pressure, so that no oil flows through
the cooler.
As the oil temperature increases (starting from 87°C) the expansion element will stop the flow to the main passage. Feed opening "k" is now under full
oil pressure. The oil now flows through the cooler.
P - Oil under pressure from the pump
R - Return into suction side of oil pump
K - Feed to oil cooler
