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 TM 55-1905-242-14
0003 00
ENGINE EXHAUST SYSTEM
Each propulsion engine has an exhaust system that quiets the exhaust and discharges it to the atmosphere. The exhaust
system contains two marine mufflers per engine. The exiting exhaust gases are cooled by raw water injected into the top of
the mufflers by an engine-driven raw water pump. As the raw water mixes with the exhaust gases, the exhaust gases are
cooled, and contract. This contraction helps to quiet the exhaust. The mufflers discharge overboard through the side of the
hull between frames 35 and 37, port and starboard.
Flexible connections at the exhaust manifold and expansion joint connectors at the hull connection isolate the exhaust
system from engine vibration and allow expansion and contraction of the system as it heats and cools.
The exhaust piping from the engines to the mufflers is insulated with three inches of thermal glass fiber installed in three, 1"
layers in accordance with MIL-I-16411. Type II insulation over the flanges is removable to allow repair of the system.
RAW WATER
EXHAUST PIPE
INLET
FLEXIBLE
CONNECTION
MUFFLERS
EXHAUST ELBOW
EXPANSION JOINT
CONNECTING
CONNECTOR
ELBOW
ENGINE EXHAUST SYSTEM (TYPICAL)
PROPULSION ENGINE RAW WATER COOLING SYSTEM
Raw water is used to cool the propulsion engine exhaust and the diesel fuel exiting the engines (see WP 0004 00). The
propulsion engine raw water cooling system also primes the bilge pumps (see WP 0007 00).
Sea chests, located immediately aft of each marine transmission, supply raw water to the system. A suction valve is located
at each sea chest to allow the incoming raw water to be secured when necessary.
0003 00-3
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