Ventilation And Drainage Systems; Engine Compartment Ventilation; Gravity Ventilation System; Forced Air Ventilation - Four winns Horizon Owner's Manual

VENTILATION & DRAINAGE SYSTEMS
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ENGINE COMPARTMENT VENTILATION

All Four Winns® stern drive models are equipped with
engine compartment ventilation. This system is designed
to meet or exceed the requirements (in effect at the time
of manufacture) of the U.S. Coast Guard, the National
Marine Manufacturers Association, and the American
Boat and Yacht Council.
A. Gravity Ventilation System
This system includes air intake and exhaust components.
The exhaust ducting reaches to the lower bilge area.
This provides adequate air movement while underway
and during bilge blower operation.
B. Forced Air Ventilation
All Four Winns® models except outboards are equipped
with an electric bilge blower. The bilge blower provides
the ventilation required prior to starting the engines and
while at idle. See Section H - Electrical Systems for
blower operation instructions.
Gasoline vapors can explode resulting in in-
jury or death. Before starting the engine, check
the engine compartment bilge for gasoline or
vapors, and operate blower for four (4) minutes,
and verify blower operation. Run blower when
vessel is operating below cruising speed. AL-
WAYS operate the bilge blower while the en-
gines are at idle.
Fumes can come from batteries while charg-
ing. A concentration of hydrogen fumes can be
explosive under the right conditions. Ensure to
follow the above warning.
NOTICE
A Gas Vapor Detector is a monitor which will
alert the operator of an accumulation of gaso-
line fumes in the engine compartment. It is op-
tional only on larger models but can be installed
by your Four Winns dealer. DO NOT rely solely
on detectors or similar equipment. ALWAYS
conduct a physical inspection of the engine
compartment.
180/190/200 Horizon
Owner's Manual
08/01
C. Engine Ventilation System Maintenance
Periodic inspection and cleaning of the ventilation ducts
is necessary to ensure adequate air circulation. A buildup
of leaves, twigs, or other debris can severely reduce
ventilation. Be sure bilge water does not accumulate to
a level that would obstruct the ventilation ducts.
Blower operation can be tested by placing a hand over
the vents. DO NOT rely on the sound of the blower. Be
sure a substantial amount of air is being exhausted by
the bilge blower. Check the bilge blower system often,
preferably before each cruise.
Should blower noise and vibration be excessive, loos-
ening the bilge blower mounting screws and then tight-
ening evenly usually reduces noise considerably.
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HULL DRAINAGE SYSTEMS

A. Transom Drain
A transom drain with plug is provided in the engine com-
partment to allow water drainage. When the boat is out
of the water, remove the drain plug and raise the bow of
the boat on the trailer so any bilge water accumulation
during dry storage will flow towards the transom and
drain.
Be sure the drain plug is securely in place prior
to launching the boat. Upon shipment of the
boat, the drain plug is usually taped to the steer-
ing wheel.
B. Bilge Pumps
Bilge pumps are provided in the bottom of the hull to
remove miscellaneous water accumulations that might
occur during normal boating or weather conditions. The
bilge pump is controlled by the Bilge Pump Switch on
the dash panel. See Section H-3 for a detailed descrip-
tion of the bilge pump switches.
Section J
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