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Exhaust System
IWARNINGI
Although diesel fuel is not as dangerous as gasoline, precautions should
be
taken to guard
against CARBON MONOXIDE GAS. Carbon monoxide is a dangerous gas that can cause un-
consciousness 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
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 at-
tention must
be
taken to make certain the exhaust system is secure, 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 engine
as practical.
The exhaust discharge
should always drop downward into the
exhaust muffler. Loops in the exhaust
hose between the water-injected ex-
haust 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.
21
GElUIIOI Rlon WITEI LIIE
!EIUITOR BElOW WilER LIIE
SEI
VRTER
PUNP
Westerbeke Generators
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