DCE80-100E
Technical Handbook
Engine Cummins QSB 5.9
Description
41
P.Group 30
TDCE01
04GB
Lubricating system
The engine is pressure-lubricated, and the oil is supplied by a
gear pump. All lubricating oil flows through a full-flow filter.
The lubricating oil is cooled in a plate oil cooler by the engine
coolant.
The lubricating system includes the following main components:
Oil pump - of rotor type, draws oil from the sump. The oil is fed
from the pressure side of the pump through the oil filter and is
then distributed to the different ducts of the lubricating system
Piston cooling – reduces substantially the piston temperature
which, in turn, contributes to a longer life of the piston rings, re-
duces the risk of carbon deposits and lowers the oil consumption.
The pistons are cooled by oil which is sprayed by nozzles into the
underside of each piston and into the cooling passages when the
piston is at the bottom dead centre.
Reducing valve – located just before the filter. The valve will
open if the lubricating oil pressure is too high and will return ex-
cess oil back to the sump.
Oil filter – of full-flow type, with a filter element of pleated filter
paper. To protect the engine against insufficient lubricating oil, a
by-pass valve is fitted in the oil filter bracket. The valve will open
if the lubricating oil pressure should rise above a certain pressure
due to clogging of the filter. When the valve is open, unfiltered oil
will flow to the engine. The filter is of disposable type and should
be scrapped after use.
Crankcase ventilation - prevents over-pressure in the crank-
case and separates fuel mist, water mist and other gaseous com-
bustion products.
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