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 TM 55-1905-223-24-18-1
the associated thermostat sends an alarm signal, via a zone module located in the
fire control panel to the fire control panel indicators. When pulled, the manual
fire pull box also sends an alarm signal via the zone module to the marine fire
detector panel indicators.
1-14. Main Propulsion System. The main propulsion system is the power source for
the main reduction gear and clutch system which transfers the power to the LCU's
p r o p e l l e r s . The system consists of two diesel engines. The engines counter-rotate;
the port engine rotates counterclockwise, and the starboard engine rotates
clockwise. The engines can be operated together or individually.
a. Engine Instrument and Control Panel. The engine control panel contains
indicators which monitor the operation of the engine. Conditions monitored by the
control panel are oil temperature, oil pressure, cooling water temperature, oil
d i f f e r e n t i a l pressure across oil filters, exhaust temperature by bank, starting air
pressure, engine RPM (tachometer), and total engine operating hours. These
conditions are monitored at the engine room console (ERC) and pilothouse console by
the machinery plant monitoring system. The engines can be started and stopped
locally at the panel and remotely from the ERC. The engine may be stopped from the
PHC, utilizing the main engine emergency trip pushbuttons.
b. Fuel System. The fuel system which is composed of a fuel pump containing a
governor, is driven by the front engine gear train. Filtered fuel is supplied to
the injectors via the fuel manifold and cylinder head drillings. Timing is provided
by a camshaft through cam rollers and push-tubes to injector rockers which actuate
the injectors at the proper time. The governor maintains the speed of the engine at
a setting determined by the engine operator. An automatic shutdown feature, which
is controlled from the machinery plant monitoring system, will energize a shutdown
solenoid, cutting off fuel flow to the engine. This solenoid also contains a
plunger for manual shutdown. The fuel system receives fuel oil from the fuel oil
transfer piping system.
c. Air Starting System. The main engine air starting system provides low
pressure air to starting motors during engine startup. When energized, a solenoid
valve releases air to the starting motor and the motor cranks the engine. The air
starting system requires low pressure air from the compressed air piping system.
d. Lubricating Oil System. The engine is pressure lubricated by a gear-type oil
pump mounted to the block and driven by the rear crankshaft gear. The lubricating
oil system receives oil from and returns oil to the engine sump. L u b r i c a t i n g oil is
supplied to the engine sump from the external lubricating oil tank via the lube oil
transfer and dirty oil discharge piping system.
e. Cooling System. The main engine cooling system provides fresh water cooling
to the engines. The cooling system receives fresh water from the fresh water
cooling piping system. Fresh water is drawn into the cooling system by centrifugal
pumps, pumped through the engine and discharged back to the fresh water cooling
piping system. The piping system then routes the heated water through the keel
cooler to cool the fresh water before it is pumped back through the engines. The
cooling system also contains expansion tanks that handle cooling system overflow and
provide a convenient point for adding coolant to the system.
1-13
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