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TM 55-1905-223-24-5
h. ExpansionTank(8). The fresh watertank with pressure cap and sight glass located on the top, front of
the engine above the heat exchanger.
i. Water Filter (9). A spin-on filter located on the right side near the front of the engine.
j. Heat Exchanger (10). The horizontal, cylindrical tank assembly located on the front of the engine
beneath the expansion tank
k. Fresh Water Pump (11). The belt driven pump located on the right front of the engine.
l. Seawater Pump (12). The U-shaped pump assembly on the right side of the engine connected to the
heat exchanger seawater inlet piping.
m. Tube Oil Filter/Cooler (13). The spin-on filter and cooling core assembly located on the right side
near the front of the engine.
n. Coolant Heater (14). The electric water jacket heater located at the right side of the oil pan.
o. Starter Motor (15). An electric motor, solenoid, and magnetic switch assembly on the right rear comer
of the engine. The battery cables are connected to the starter.
p. Bypass Oil Filter (16). A spin-on filter located on the right rear comer near the top of the engine.
q. Exhaust Manifold (17). The water cooled exhaust air assembly on the right side of the engine. The
turbocharger is mounted on this manifold.
r. Turbocharger (18). A turbine wheel unit mounted on the exhaust manifold on the right side of the
engine.
s. Electrical System. Consists of the batteries, starter and solenoid, and instrument panel Batteries are
located remote from the engine assembly. For maintenance information on batteries, refer to TM 55-1905-223-
24-1.
1-9. Engine Identification Data. For model identification of an engine, check the data or serial number plate.
The following example shows how the engine is identified.
NT 855-M
N = Model Identification
T = Turbocharged
855 = Cubic Inch Displacement
M = Marine Application
a. Engine Dataplate. The engine dataplate (FIGURE 1-2) shows specific information about your engine.
The engine serial number and the Control Parts List (CPL) provide information for ordering parts and service
needs.
Change 2
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