Workshop Manual

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 c rankshaft 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 ﬂow 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 th e safety valve. High pressure can occur in the cold

start phase of the engine if the engine oil is not yet of sufﬁcient 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.