LUBRICATION SYSTEM CONTINUED
Oil Flow Through Filter Housing to Engine
Refer to Table 2.
The engine oil pump is mounted to the back of the front gear train on the lower right hand side of the engine. The
engine oil pump is driven by an idler gear from the crankshaft gear. Oil is pulled from the sump to the oil pump and
pushed from the oil pump through the bypass valve on the way to the engine oil cooler. The bypass valve controls
the oil pressure from the engine oil pump. The engine oil pump can supply excess oil for the lubricating system.
When this situation is present, the oil pressure increases, and the bypass valve opens allowing the excess oil to
return to the sump.
High pressure relief valve regulates high pressure in the system by allowing the oil to return to the sump when the
oil pressure reaches 100 psi (690 kPa). The oil then flows through the engine oil cooler. The engine oil cooler uses
engine coolant in order to cool the oil. The oil cooler bypass valve directs the oil flow through the engine oil cooler
by two different methods.
Oil cooler bypass valve will close partially when the oil temperature exceeds 212°F to 217°F (100°C to 103°C). This
will direct some of the oil through the engine oil cooler. If the oil reaches a temperature of 260°F (127°C), the
bypass valve will close fully. This will direct all of the oil flow through the engine oil cooler.