TP-5982 4/06 19Section 4 Exhaust System
Section 4 Exhaust System
Carbon monoxide.
Can cause severe nausea,
fainting, or death.
The exhaust system must be
leakproof and routinely inspected.
WARNING
Carbon monoxide symptoms. Carbon monoxide can
cause severe nausea, fainting, or death. Carbon monoxide
is a poisonous gas present in exhaust gases. Carbon
monoxide poisoning symptoms include but are not limited to
the following:
D Light-headedness, dizziness
D Physical fatigue, weakness in
joints and muscles
D Sleepiness, mental fatigue,
inability to concentrate
or speak clearly, blurred vision
D Stomachache, vomiting, nausea
If experiencing any of these symptoms and carbon monoxide
poisoning is possible, seek fresh air immediately and remain
active. Do not sit, lie down, or fall asleep. Alert others to the
possibility of carbon monoxide poisoning. Seek medical
attention if the condition of affected persons does not improve
within minutes of breathing fresh air.
Inspecting the exhaust system. Carbon monoxide can
cause severe nausea, fainting, or death. For the safety of
the craft’s occupants, install a carbon monoxide detector.
Consult t he boat builder or dealer for approved detector
location and installation. Inspect the detector before each
generator set use. In addition to routine exhaust system
inspection, test the carbon monoxide detector per the
manufacturer’s instructions and keep the detector operational
at all times.
Operating the generator set. Carbon monoxide can cause
severe nausea, fainting, or death. Carbon monoxide is an
odorless, colorless, tasteless, nonirritating gas that can cause
death if inhaled for even a short time. Use the following
precautions when installing and operating the generator set.
Do not install the exhaust outlet where exhaust can be drawn
in through portholes, vents, or air conditioners. Avoid
overloading the craft. If the generator set exhaust discharge
outlet is near the waterline, water could enter the exhaust
discharge outlet and close or restrict the flow of exhaust.
Never operate the generator set without a functioning carbon
monoxide detector. Be especially careful if operating the
generator set when moored or anchored under calm
conditions because gases may accumulate. If operating the
generator set dockside, moor the craft so that the exhaust
discharges on the lee side (the side sheltered from the wind).
Always be aware of others, making sure your exhaust is
directed away from other boats and buildings.
Note: Should any information regarding installation
conflict with USCG regulations, follow USCG
regulations.
4.1 Exhaust Lines
Use water-cooled exhaust lines in all marine
installations. Use a 51-mm (2-in.) inside diameter hose.
Keep the lines as short and straight as possible.
NFPA 302 Fire Protection Standard for Pleasure and
Commercial Motor Craft, Clause 4-3 recommends using
two corrosion-resistant hose clamps with a minimum
width of 13 mm (1/2 in.) on each end of the flexible
exhaust hose connections. Kohler Co. requires a
downward pitch of at least 13 mm per 30.5 cm (0.5 in.
per running foot). Use a flexible exhaust hose that
conforms to UL Standard 1129 for the engine wet
exhaust components between the mixer elbow and the
exhaust outlet.
4.2 Exhaust Systems
Mount the silencer independently to eliminate stress on
the exhaust system and the exhaust manifold/mixer
elbow. See Section 7, Installation Drawings for the
mixer elbow waterline hose size. See Figure 4-1,
Figure 4-2, Figure 4-3, or Figure 4-4 for the exhaust
connection to the mixer elbow. Provide an adequate
hose length from the exhaust mixer to the silencer to
allow for generator set movement.
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