
EPA07/10 DD PLATFORM WORKSHOP MANUAL - ENGINE
21.1 DESCRIPTION AND OPERATION OF OIL PUMP AND RELATED
COMPONENTS
The oil pump supplies all of the engine oil circuits with engine oil. The oil pump ensures that
engine oil is available under all operating conditions, in adequate quantities, at the required
pressure, and to the respective locations.
A crankshaft drive gear drives the oil pump drive gear. The oil pump drive gear drives the two
impellers within the oil pump housing. The rotational movement of the impellers and the design
of the pump chamber suctions the engine oil from the oil pan, through oil strainer to the oil pump
inlet. The engine oil is delivered under pressure to the oil pump outlet, to the oil pump pressure
line and then through the return
fl
ow check valve to the main oil duct, into the engine oil circuit.
The pressure regulator valve regulates engine oil pressure. The pressure regulator valve has the
oil pressure applied to it from the engine oil in the main oil duct. Excess engine oil is fed by the
pressure regulator valve to the suction side according to the oil pressure in the main oil duct. This
regulates the engine oil pressure and reduces the operating energy input of the oil pump. High
pressures in the oil circuit are avoided using the safety valve. High pressure can occur in the cold
start phase of the engine if the engine oil is not yet of suf
fi
cient viscosity. The safety valve opens
at a pressure >10 bar and directs part of the engine oil back into oil pan.
All information subject to change without notice.
DDC-SVC-MAN-0081 2010
Copyright © 2010 DETROIT DIESEL CORPORATION
21-3
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