Engine Cooling Systems; Raw Water Cooling - Stern Drives & Inboards - Four winns 248 Vista Owner's Manual

Changing either diameter or pitch will have an effect on
engine speed and prop slip, and in turn, directly effect the
performance of a boat. The propellers included with each
Four Winns® boat provide the best general performance
based on data obtained from on-the-water testing of that
model. Variations in load, operating conditions, environ-
ment, the individual engine and hull performance may ne-
cessitate the purchase and use of another propeller(s).
Under your normal load conditions, the engines should
turn within the maximum RPM range when at full throttle.
If the engines exceed the recommended RPM, an increase
in pitch or diameter is required. If the engine RPM is too
low, a decrease in pitch or diameter is required.
The load carried in a boat will directly affect performance
of the engine. If an engine that is not developing full power,
be sure the engine is properly tuned and load conditions
are those normally experienced, before changing propel-
lers.
NOTICE
For twin engine installations, always check drive
shaft rotation before propeller installation. A right
hand rotation propeller must be installed on the
starboard propeller shaft. Similarly, a left hand
prop must be installed on the port propeller shaft.
For shipping reasons, the propellers are not factory in-
stalled. Initial installation of the propellers will be per-
formed by the dealer during pre-delivery service. See Fig-
ure E6.
Figure E6: Prop Installation
Vista™ Owner's Manual
™
NOTICE
Should it be necessary to change propellers,
always use an appropriate propeller removal tool
or "Prop Puller." DO NOT attempt removal us-
ing a hammer. Damage to the propeller or pro-
peller 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 per-
formance. For additional information on factors affecting
performance and/or assistance with your selection,
please consult your Four Winns dealer.
E - 6

ENGINE COOLING SYSTEMS

A. Raw Water Cooling - Stern Drives & Inboards
The cooling system is a seawater system. Seawater
(raw) water is taken in through water inlets on the both
sides of the lower gear unit of the stern drives models or
by thru-hull intake scoops with strainers (inboards).
Water pumped to the engine by the seawater pump is
circulated through the engine by the engine circulating
pump. A thermostat controls the engine operating tem-
perature by determining the amount of water to be taken
in, recirculated and discharged. On stern drive models,
the water is discharged through an idle exhaust relief
and the exhaust through the propeller hub. Inboard
models expel water and exhaust through exhaust ports.
A temperature gauge(s) located on your instrument panel
monitors engine(s) temperatures.
NOTICE
Inboard boats utilize exhaust hoses to relinquish
cooling water. A periodic inspection of the hoses,
muffler and related parts should be made to in-
sure that leaks or heat deterioration have not
resulted. Replace them as necessary.
Never operate your engine without a thermo-
stat. Engine damage can occur and is consid-
ered operator negligence and therefore not cov-
ered under the engine warranty.
Section E
Page 6