DCE80-100E
Technical Handbook
Engine TWD731VE
Description
10
P.Group 30
TDCE01
04GB
Lubricating system
The engine is pressure-lubricated, and the oil is supplied by a
pump in the oil sump. All lubricating oil flows through a full-flow
filter. One part of the oil flows through a by-pass filter for separa-
tion of extremely small particles.
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 gear type, which draws oil through a coarse strain-
er that arrests larger particles. The pump delivers oil through the
lubricating oil filters to the various passages of the lubricating sys-
tem.
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.
Cooling is controlled by a piston cooling valve which shuts off the
cooling oil supply at low engine speeds. This ensures that the lu-
bricating oil flow will be a maximum when the engine is started
and when it is running at idling speed. The valve also restricts the
pressure of the piston cooling oil at high engine speeds, to make
more oil available for lubrication.
1. Oil pump
2. Reducing valve
3. By-pass valve
4. Oil under pressure to
the lubrication system
5. Piston cooling valve
6. Oil under pressure for
piston cooling
7. Oil cooler
8. By-pass filter
9. Oil filter
Lubricating system
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