Oil Flow Through Lubrication System
Refer to Table 1.
The lubrication system (Figure 1) supplies 230°F (110°C) filtered oil at approximately 40 psi (276 kPa) at rated
engine operating conditions. Oil pump bypass valve is controlled by the engine oil manifold pressure, rather than
the oil pump pressure. The engine oil manifold pressure is independent of the pressure drop that is caused by the
engine oil filter and the engine oil cooler.
Oil cooler bypass valve maintains the engine oil temperature at 230°F (110°C). High pressure relief valve, which is
located in the filter base, protects the filters and other components during cold starts. The opening pressure of the
high pressure relief valve is 100 psi (690 kPa). The bypass housing diverts five percent of the oil to the oil sump
through the bypass valve. The remaining oil continues through the filter and oil filter bypass valve. The opening
pressure of the oil filter bypass valve is 25 psi (172 kPa). Engine oil pressure sensor is part of the engine protection
The turbocharger cartridge bearings are lubricated by an oil supply line from the main oil gallery, and oil drain line
returns the oil flow to the sump.