Westerbeke 9.0 BCG Technical Manual page 22

Exhaust System
IWARNINGI
Carbon monoxide exhaust gas is deadlyl Carbon monoxide is a dangerous gas that can
cause unconsciousness and is potentially lethal. Some
of
the symptoms or signs of carbon
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
The generator must have its own separate exhaust system and must 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, backing down, from following seas or any other conditions. Special attention
must be made to ensure that the exhaust system is secure and tight and free
of
leaks.
The sea water supply thru-hull sea cock fittings
l11.US1.
be of the flush-hull type. High-speed or weedless scoop
type fittings should not be used, as they tend to pressurize the thru-hull and encourage siphoning.
When a water lift type exhaust sys-
tem is used, the exhaust muffler
should be mounted as close to the
engine as practical. The exhaust
discharge should always drop
downward into the exhaust muf-
fler. Loops in the exhaust hose be-
tween the water-injected exhaust
elbow and the water lift muffler
should be avoided as these will
trap and hold water.
SEA
-~'''''''flTU
For installations where the exhaust
manifold/water-injected exhaust
elbow is at or below the vessel's
water line, provisions
l11.U.St.
be
made to install a siphon-break or a
vent in the sea water supply hose
to the water-injected exhaust
elbow to stop the flow of raw water
through the raw water cooling sys-
tem, 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 always
be above the water line at all
angles of vessel operation to
prevent Siphoning. The vent,
Westerbeke Generators 16
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