Section 3 - On the Water
90-866938081 MAY 2009 Page 27
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 one 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)
Basic Boat Operation
Freezing Temperature and Cold Weather Operation
IMPORTANT: If the boat is operated during periods of freezing temperature, take
precautions to prevent freezing damage to the power package. Damage caused by freezing
is not covered by Cummins MerCruiser Diesel Limited Warranty.
NOTICE
Water trapped in the seawater section of the cooling system can cause corrosion or
freeze damage. Drain the seawater section of the cooling system immediately after
operation or before any length of storage in freezing temperatures. If the boat is in the
water, keep the seacock closed until restarting the engine to prevent water from flowing
back into the cooling system. If the boat is not fitted with a seacock, leave the water inlet
hose disconnected and plugged.
NOTE: As a precautionary measure, attach a tag to the key switch or steering wheel of the
boat reminding the operator to open the seacock or unplug and reconnect the water inlet
hose before starting the engine.
In order to operate the engine in temperatures of 0° C (32° F) or lower, observe the following
instructions:
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