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Figure E5: Prop Installation
NOTICE
Should it be necessary to change propellers, al-
ways use an appropriate propeller removal tool or
"Prop Puller." DO NOT attempt removal using a
hammer. Damage to the propeller or propeller
shaft can result.
Always check shaft rotation before propeller installation.
A right hand rotation propeller must be installed on the
prop shaft connected to a starboard engine. Similarly, a
left hand prop must be connected to the port engine shaft.
The propellers must rotate outboard not inboard.
Be sure the propellers are of the correct blade configura-
tion, diameter, pitch, and shaft size to assure good perfor-
mance. For additional information on factors affecting
performance and/or assistance with your selection , please
consult your Four Winns dealer.
E - 5
ENGINE COOLING SYSTEM
Your 378 Vista™ includes a "closed water cooling" sys-
tem as standard equipment. This system provides ad-
equate engine cooling without exposing the internal en-
gine to the detrimental effects of surface water, including
salt, highly polluted or silt-laden water. The engine own-
ers manual provides additional information regarding ser-
vice and maintenance of this equipment.
The 378 Vista uses surface water as a cooling medium
for the heat exchanger. The cooling water employed en-
ters the system through a water intake and is relinquished
through the exhaust manifold system.
378 Vista™ Owner's Manual
™
378
Inboards utilize thru-hull water intake scoops. These
types of intakes have an external strainer. Be sure strain-
ers are kept free of mud, weeds and other debris. Some
boating areas require that additional strainers or water
intake filters be installed. Reference Section P-3 - Equip-
ment Installation, in this manual for installation instruc-
tions and consult your Four Winns dealer regarding any
special equipment that may be required.
A gate valve or seacock is provided at each engine in-
take scoop previously described. Be sure these valves
are in the open position (lever is parallel with the valve)
when operating the engines and in the closed positions
(lever is perpendicular to valve) when engines are not
operating for an extended period of time.
Serious engine damage could result if
seacock valve(s) is not open during
engine(s) operation. Ensure seacock valve(s)
are in the open position when operating
engine(s).
Should an engine intake or an exhaust or cool-
ing hose rupture, turn the engine off and close
the seacock immediately. Proceed under tow,
if necessary, to a service facility for appropriate
repairs; maintain a close visual watch on the
problem hose and also on the bilge water level.
Inboard boats utilize exhaust hose to relinquish cooling
water. A periodic inspection of the hose, muffler and re-
lated parts should be made to insure that leaks or heat
deterioration have not resulted. Replace them as neces-
sary.
E - 6
RUNNING ANGLE
Hull planing surfaces have the least amount of drag at a
three to five degree angle with the water. This is the
preferred running angle when boating. The running angle
has a significant impact on top speed and handling.
Heavy load or certain water conditions may make it diffi-
cult to achieve the optimum running angle. See Figure
E6.
The running angle can be controlled through the use of
trim tabs. See Section E-7 - Trim Tabs and Section T-7
- Trimming Your Boat for information on the use of trim
tabs.
Section E
Page 6
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