
Exhaust System
IIWARNINGI
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, or while the vessel
is
under
sail
or
power in which case
the vessel may experience heeling
or
backing down from following seas
or
any other conditions. Special
attention must be taken
to
make certain the exhaust system is secure and tight and free of leaks.
The sea water supply through-hull sea cock fittings
must
be
of the flush-hull type. High-speed scoop type
fittings must not
be
used, as they tend
to
encourage siphoning.
When a water lift type exhaust system
is
used, the exhaust muffler should be mounted as close
to
the
en-
gine as practical. The exhaust discharge
should always 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
exhaust
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-injected ex-
haust elbow. This stops the flow of sea
water that runs through the sea water
cooling system from filling the exhaust
and engine cylinders when the engine
is
shut down. This sea water supply 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 must
al-
ways be above the water line during
all
angles of vessel operation
to
prevent
siphoning. The vent, when used, must
have its vent hose
or
tube routed so it can
remain above the water line and empty of
water when the engine is shut down. This
allows air
to
enter through this vent
to
prevent siphoning.
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21
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Westerbeke Generators
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