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 TM 5-685/NAVFAC MO-912
PLATFORM
COVER FOR ACCESS
TO SCAVENGING AIR VALVES
LINERS
COOLING OIL AREA
WATER COOLED
O F PISTON HEAD
EXHAUST HEADER
SCAVENGING
AIR HEADER
SCAVENGING
AIR PASSAGE
REMOVABLE COVERS
AND
INJECTION PUMP
M A I N BEARING
C O N N E C T I N G ROD
CRANKSHAFT
.
TIE
Figure 3-8. Cross Section of a diesel engine showing chamber for lubricating oil collection.
elevated tanks and two sets of pumps are also used.
end of the engine, either inside or outside the crank-
Sump capacities vary with horsepower.
case, and driven by the crankshaft. In other en-
e. Lube oil pumps. In most engines, an engine-
gines, the pump is mounted on the end and driven
driven rotary pump supplies pressure needed to cir-
from the camshaft gears. Larger diesel engines fre-
culate oil through the engine lubrication system. Oil
quently have an auxiliary, motor-driven pump that
pressure varies from 5 to 60 pounds, depending on
circulates oil to the bearings before the engine is
diesel engine type. The pressure depends on the
started. As soon as the engine is up to speed, the
amount of clearance in the bearings and the capac-
pump shuts down. The auxiliary pump also serves
ity of the pump.
as an emergency lubricating oil pump in case the
f. Types of pumps. Lubricating oil pumps are usu-
engine-driven pump fails. Finally, the auxiliary
pump circulates the oil for a time after the engine is
ally built into and driven by the engine. In high-
speed engines, the oil pump is usually placed in the
crankcase sump and driven from the camshaft by a
When this method is used, a check valve in the
discharge line of the auxiliary pump is necessary to
vertical shaft. In larger engines, the pump can be
chain-driven by the crankshaft, or mounted at the
prevent the oil from flowing back when the engine
3-14
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