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 TM 55-1905-223-24-5
SECTION II. EQUIPMENT DESCRIPTION AND DATA
1-6. General Description. The NT855-M is a 300 hp, 6 cylinder, water cooled diesel engine designed for
marine use. This engine will furnish drive power to the bowtruster waterjet unit and to the number three fire
pump.
1-7. Characteristics, Capabilities, and Features. A very broad view of the bowthruster engine is as follows:
a. Characteristics.
(1) Turbocharger allows more horsepower to be developed
(2) Fuel injectors deliver atomized fuel into the combustion chambers for ignition by heat of compressed
air.
(3) Cooling is supplied by: coolant for engine operation heat; a lube oil cooler, which gives off heat to
engine coolant; and an aftercooler, which cools (or warms) air before it reaches the turbocharger.
b. Capabilities and Features.
(1) Furnishes 300 hp to drive the waterjet.
(2) Has power takeoff clutch assemblies on each end to drive the waterjet and the auxiliary fire pump.
(3) Has both remote and local control station.
1-8. Location and Description of Major Components. FIGURE 1-1 shows views of each side of the engine with
the locations of major components indicated. Refer to FIGURE 1-1 and the reference number key below for
the description of these components.
a. Instrument Panel (1) An electrical panel on top of the engine that contains the local display of
operational gauges and the switches for local control of the engine.
b. Air Cleaner (2). The filter canister and cover assembly located on the top, rear of the engine.
c. Intake Manifold (3). The intake air distribution piping (assembly) on the left side of the engine.
d. Sump Pump (4).
The manually operated oil pump located on the left rear of the engine.
e. Fuel Filters (5).
Two spin-on filters located together on the lower left side of the engine.
f. Lube Oil Pump (6). A gear driven pump located on the left front comer of the engine.
g. Fuel Pump (7). A PT (type G) pump and throttle assembly with a 24 volt shutoff valve, located on the
left front of the engine.
Change 2
1-2
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