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 TM 5-1940-277-20
TM 1940-20/2
1-15. AIR-EXHAUST SYSTEM.
The port engine and the starboard engine have individual air-exhaust systems. The systems are
identical except that the port engine discharges exhaust gases to port and starboard engine discharges
exhaust gases to starboard. Both port and starboard exhaust systems are cooled by raw water from the
hydrojet. The MK2 exhaust is cooled by water from the hydrojet. On the MK1 boats, a hybrid system
from self-contained fresh water cooling has been installed. Refer to paragraph 1-12 MK1 engine cooling
system.
a. Air Intake draws air for combustion from the engine compartment. The air intake contains filters
that remove particles from the air that could cause engine damage.
b. Turbocharger draws a large amount of air (approximately 360 cubic feet per minute) and
supplies it to the intercooler where it is cooled before entering the intake manifold. The turbocharger is
driven by exhaust gas expanding through a turbine wheel.
c. Heat Shield The MK1 and MK2 w/Sabre heat shield encloses the turbocharger's turbine housing
which operates at high temperature. The heat shield contains insulation, but may cause burns if
touched during, or immediately after extensive operation of the engine.
d. Exhaust Pipe carries the exhaust gases to the flexible connection and on to the exhaust port on
the side of the boat at water level. The exhaust gases are cooled by raw water from the raw water
cooling system. The raw water enters the exhaust pipe just after the point where gases leave the
turbine housing.
e. Flexible Connection is a short piece of bellows-type rubber tubing and is used to isolate the
engine from the hull.
1-16. FIRE EXTINGUISHING SYSTEM.
a.
Automatic Operated Fire Extinguishers are located on the underside of each engine
compartment hatch. Each extinguisher is equipped with sensor/spray nozzle that operates the
extinguisher when subjected to flames or extreme heat.
b.
Hand-Held Fire Extinguisher is located in bracket, on right side of the forward cockpit.
Operating instructions are printed on the extinguisher.
Change 2
1-23
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