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TM 10-4930-250-13&P
Thedieselis a compressionignitionengine:ignitionis achievedby compressinga fitel-air mixturein a cylinderuntil thehe-at
generated by compression causes the mixture to ignite. The resulting combustion causes the mixture to expand, forcing the
piston to move. The diesel engine is a two cylinder, direct injection engine. An individual fuel injector and injection pump
supplies pressurized fuel alternately to each cylinder.
An on-board fuel tank is the normal fuel source for engine operation. However, a fuel selector valve allows selection of an
external fuel source, if desired. A fuel filter/water coalescer in the supply line removes impurities and water from the fuel,
regardless of source. The engine fuel pump continuously supplies fuel to the fuel injection pumps; a fuel return line allows
surplus fuel to return to the fuel tank.
1. 11.3
Electrical Subsystem.
All electrical power distribution, control and monitoring is performed by the electrical subsystem. The subsystem consists of
the system battery, the control panel, the alternator, the voltage regulator, the engine starting motor, the auxiliary pump,
various engine and pumpage sensors, controls, and the interconnecting cables.
1. 11.4
Defueling Subsystem.
The defueling subsystem consists of the auxiliary pump module connected in the AAFARS to pump fuel from system
components to the fuel drums. Figure 1-19 illustrates one common configuration. The auxiliary pump is a rotary vane,
positive displacement pump capable of a maximum flow rate of 13 gpm. It is equipped with two-inch unisex couplings at
inlet and outlet, allowing
it to be connected directly to almost every system component. It may be used to defirel the entire
system, or an individual
component such as the liquid fuel filter-separator
or even a single length of hose.
The auxiliary pump may also be used to evacuate air from a fuel bladder. Purging the fuel bladder of air is necessary to
prevent cavitation in the fuel transfer pump during normal system operation.
1-27
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