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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
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 elimi-
nate gasoline vapors. Blowers and fans may also be
provided for ventilation and to mitigate the migration 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 ob-
structed or restricted, collapsed, kinked, or crushed
5. Eliminating sags in ducting that can form a water
trap
6. Checking hangers and other supports
7. Ensuring blower/fan is operational
8. Ensuring that airflow is present at discharge
9. Inspecting wiring to equipment
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X. Maintenance - Bulkhead and Deck Integrity
1. Seal all visible openings (e.g., cracks, crevices,
holes, including openings around wiring and piping
runs) in bulkheads and decks that separate ma-
chinery compartments from occupied compart-
ments. These openings can permit migration of
CO vapors.
2. Check gaskets and sealing surfaces on hatches,
doors, and access panels.
Y. Maintenance - Air Conditioning Systems
These systems can be a source of CO ingress and
migration of CO vapors.
1. Keep grilles and filters clean.
2. Seal bulkhead voids and openings at wiring and
piping runs in return air ducting, plenums, and air
handling equipment enclosures, especially those
adjacent to machinery compartment bulkheads.
3. Check that water traps and condensate drains are
present. These may be in the form of a double
loop in the drain line or prefabricated p-traps. Any
drain that discharges below the waterline when the
boat is underway is sealed, by virtue of its design,
against CO intrusion.
Z. Maintenance - Liquid Drains
Sink, shower and condensate drains can be a source
of CO ingress. Ensure that water traps are present
and contain fluid. These traps may be in the form of a
double loop in the drain line or prefabricated p-traps.
Any drain that terminates below the waterline is, by vir-
tue of its design, sealed against CO intrusion. Some
drains that are below the waterline when boat is under-
way will be above the waterline when the boat is at rest.
The location of drains, relative to the waterline, can be
affected by the dynamics of boat motion (i.e., under-
way or at rest).
AA. CO Detection System
Four Winns has included two CO detectors as a stan-
dard feature. One of the CO detectors is located in the
forward V-berth and the other is located in the aft/mid
cabin. Check systems and maintain in accordance with
the manufacturer's instructions.
Section B
Page 10
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