Four winns 358 VISTA, Owner'S Manual

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Owner’s Manual Page 33 Boating Safety - Section B
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., shaft, strut propeller, rudder and trim tabs)
3. Incorrect selection of propeller size
V. Maintenance - Exhaust System Integrity
Gas tight integrity of exhaust systems must be
maintained 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
5. Clamps
6. Mufflers and their drain plugs
7. Thru-hull fittings
8. Hangers and other supports
W. Maintenance - Ventilation Systems
Boats are equipped with ventilation systems to
eliminate gasoline vapors. Blowers and fans may also
be provided for ventilation and to mitigate the migra-
tion of CO into occupied compartments. Attention
should be paid to the following:
1. Keeping ventilation intakes clear of debris
2. Replacing damaged hardware
3. Maintaining the integrity of the ducting material
and its connections
4. Ensuring that position of ducting intake is not
obstructed or restricted, collapsed, kinked,
or crushed.
in the accumulation of carbon monoxide in the
accom modation (occupied) space. Do not use
gasoline powered portable generators on Four
Winns
®
boats.
T. Maintenance - Engine Performance
Efficient engine performance is vital to minimizing
CO production. The following items are those consid-
ered 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
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 relatively
high tem perature within manufacturer’s
specifica tions.
c. Exhaust Back-Pressure - Certain alter ati ons
to the exhaust system may in crease engine
exhaust back pressure and CO production.
d. Restricted engine room or compartment
ventilation