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2. Reduced power resulting from increased altitude
may require adjustments to propeller size.
3. Heavy sea or out of trim conditions tend to load
engines resulting in reduced performance and
thereby increasing their CO production.
S. Portable Generator Sets
Never use a portable generator on a boat.
Gasoline-powered portable generators are available
in the marine market place and are not an option
available through Four Winns. Portable generators
will produce CO. These sets discharge their exhaust
products in locations which can lead to an increase
in the accumulation of carbon monoxide in the accom-
modation occupied space. Do not use gasoline-pow-
ered portable generators on Four Winns
T. Maintenance - Engine Performance
Efficient engine performance is vital to minimizing
CO production. The following items are those con-
sidered to have the greatest effect on in creased CO
production:
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 plug.
b. Worn points or incorrect gap on points
Boating Safety - Section B
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 en gines
increase CO production. Engine cooling water
system design and selection of thermostat(s)
are primary consider ati ons affecting engine
operating tempera ture. Generally, an engine
produces less CO if it operates at a rela-
tively high tem perature within manufacturer's
specifica t ions.
c. Exhaust Back-Pressure - Certain alter ati ons
to the exhaust system may in crease engine
exhaust back pressure and CO production.
boats.
®
d. Restricted engine room or compartment
ventilation
U. Maintenance - External Conditions
External conditions that contribute to inefficient engine
performance can include:
1. Fouled hull bottom
2. Damaged and fouled running gear (i.e., outdrive
shaft, strut propeller, rudder and trim tabs,
if applicable)
3. Incorrect selection of propeller size
V. Maintenance - Exhaust System Integrity
Gas tight integrity of exhaust systems must be main-
tained to insure that leakage of CO within the boat
does not occur. Disassembly may be required
to carry out a thorough inspection. Repair or replace
components as indicated. Inspect the following:
1. Gaskets at cylinder head connection
2. Casting and pipe fittings in the dry section
3. All joints
4. Hoses
Owner's Manual Page 35
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