Mercury 8.1S Horizon, Product Applications Manual

Page: 72 / 163

Exhaust System
90-863758060 AUGUST 2006 Page 6A-3
!
WARNING
Avoid prolonged exposure to carbon monoxide. Carbon monoxide poisoning can lead to
unconsciousness, brain damage or death. Ensure that the boat, while at rest or
underway, is well ventilated.
GOOD VENTILATION
Ventilate passenger area, open side curtains, or forward hatches to remove fumes.
1. Example of desired air flow through the boat.
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POOR VENTILATION
Under certain conditions, permanently enclosed or canvas enclosed cabins or cockpits with
insufficient ventilation may draw in carbon monoxide. Install 1 or more carbon monoxide
detectors in your boat.
Although the occurrence is rare, on a very calm day, swimmers and passengers in an open
area of a stationary boat that contains or is near an operating engine may be exposed to
a hazardous level of carbon monoxide.
1. Examples of poor ventilation while a boat is stationary:
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a
b
a - Operating the engine when the
boat is moored in a confined
space.
b - Mooring close to another boat with
its engine operating.
2. Examples of poor ventilation while a boat is moving:
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a
b
a - Operating the boat with the trim
angle of the bow too high.
b - Operating the boat with no forward
hatches open (station wagon
effect).
Exhaust Connections
!
CAUTION
Avoid exhaust hose failure which could cause exhaust or discharge water to enter the
boat. Discharge water from the exhaust elbow must flow without restriction around the
entire inside diameter of the exhaust hose to avoid causing hot spots, which could
eventually burn through the exhaust hose. Connect the exhaust hoses and tubes to the
exhaust elbows so that they do not restrict the flow of discharge water from the exhaust
elbows.