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L. Cabin Appliances
Boats having fuel burning appliances in accommodation
areas should be provided with adequate ventilation and
maintained to function properly.
M. Air Conditioning
It may be possible for carbon monoxide to be brought into
the air conditioned space by the air conditioner. If in-
stalled, please refer to the air conditioner manufacturer's
literature for additional information.
N. Ventilation of Accommodation Spaces
Accommodation spaces need to be ventilated to intro-
duce fresh air into the spaces. Ventilation method; e.g.
windows, hatches, doors, and blowers; used to accom-
plish this may, under certain conditions, bring hazardous
levels of CO into the accommodation spaces. Care should
be taken to be aware of all prevailing conditions when us-
ing these ventilating methods.
O. Altitude and Sea Conditions
Changes in altitude greater than 5,000 feet contribute to
inefficient engine performance and may require adjustments
to the ignition systems, fuel systems, or changing the
propeller's size.
1. Failure to make adjustments to ignition systems, fuel
systems, and propeller size may cause an increase
in CO production.
2. Heavy sea conditions tend to load engines resulting
in reduced performance and thereby increasing their
CO production.
P. Portable Generator Sets
Gasoline powered portable generator are available in the
marine market place and is not an option available through
Four Winns. The portable generator will produce CO.
These sets discharge their exhaust products in locations
which can lead to an increase in the accumulation of car-
bon monoxide in the accommodation space. This equip-
ment is not recommended for use on Four Winns boats.
Q. Maintenance - Engine Performance
Efficient engine performance is vital to minimizing CO pro-
duction. The following items are those considered to have
the greatest effect on increased CO production:
Vista Owners Manual
10/93
1. Fuel Systems - Fuel that is contaminated, stale or
incorrect octane number.
2. Carburetors/Injectors
a. Dirty or clogged flame arrester.
b. Malfunctioning automatic choke plate or faulty
adjustment of manual choke plate.
c. Worn float needle valve and seat.
d. High float level.
e. Incorrect idle mixture adjustment.
f.
Dirty or worn injectors.
3. Ignition System
a. Fouled or worn spark plugs.
b. Worn points or incorrect gap on points.
c. Shorted or opened circuit high tension spark plug
cables.
d. Incorrect ignition timing.
4. General
a. Worn piston rings and valves.
b. Engine temperature - Cold running engines in-
crease CO production. Engine cooling water
system design and selection of thermostat(s)
are primary considerations affecting engine op-
erating temperature. Generally, an engine pro-
duces less CO if it operates at a relatively high
temperature within manufacturer's specifications.
c. Exhaust Back-Pressure - Certain alterations to
the exhaust system may increase engine ex-
haust back pressure and CO production.
d. Restricted engine room or compartment ventila-
tion.
R. Maintenance - External Conditions
External conditions that contribute to inefficient engine
performance are:
Section H
Page 6
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