THEORY OF OPERATION - CONTINUED
ENGINE - CONTINUED
Engine Lubrication System.
Lubrication system supplies 230°F (110°C) filtered oil at approximately 40 psi (275 kPa) at rated engine
operating conditions. Oil pump bypass valve is controlled by engine oil manifold pressure, rather than oil
pump pressure. Engine oil manifold pressure is independent of pressure drops caused by engine oil filter
and engine oil cooler.
Oil cooler bypass valve maintains engine oil temperature at 230°F (110°C). High pressure relief valve,
located in filter base, protects filters and other components during cold starts. Opening pressure of high
pressure relief valve is 100 psi (690 kPa). Opening pressure of oil filter bypass valve is 25 psi (170 kPa).
Engine oil pressure sensor is part of engine protection system.
Turbocharger cartridge bearings are lubricated by oil supply line from main oil gallery and oil drain line
returns oil flow to sump.