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Exhaust System
IWARNINGI
CARBON MONOXIDE EXHAUST GAS IS DEADLY. Carbon monoxide is a dangerous gas that
can cause unconsciousness and is potentially lethal. Some of the symptoms or signs of carb-
on monoxide inhalation or poisoning are listed below.
o Dizziness
o Vomiting
o Intense Headache
o Muscular twitching
o Weakness and sleepiness
o Throbbing in temples
All exhaust systems should be such that the entry of sea water into the engine's exhaust manifold and
cylinders is prevented while the engine is not running, when the vessel is under sail or power, healing, back-
ing down, from following seas or any other conditions. Special attention must be made to ensure that the ex-
haust system is secure and tight and free of leaks.
The sea water supply thru-hull sea cock fittings
must
be of the flush-hull type. High-speed scoop type fit-
tings should not be used, as they tend to encourage siphoning.
When a water lift type exhaust
system is used, the exhaust muf-
fler should be mounted as close
to the engine as practical. The
exhaust discharge should al-
ways drop downward into the
exhaust muffler.
Loops in the
exhaust hose between the
water-injected exhaust elbow
and the water lift muffler should
be avoided as these will trap and
hold water.
For installations where the ex-
haust manifold/water-injected
exhaust elbow is at or' below the
vessel's water line, provisions
must be made to install a siphon-
break or a vent in the sea water
supply hose to the water-in-
jected exhaust elbow to stop the
flow of raw water through the
raw water cooling system, filling
the exhaust and
engine
cylinders when the engine is
shut down. This sea water supp-
ly hose must be looped above
the water line and the siphon-
break or vent installed in the high
point of the loop above the water
line. This siphon-break or vent
&uer-ator Above Wabr line
7
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