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NOTICE
Should it be necessary to change propel lers,
always use an appro priate propeller removal
tool or "Prop Puller." DO NOT attempt removal
using a ham mer. Dam age to the propeller or
propeller shaft can result.
Be sure the propellers are of the correct blade con-
figuration, diame t er, pitch, and shaft size to assure
good performance. For additional information on
factors affecting performance and/or assistance with
your selection, please consult your Four Winns dealer.
NOTICE
For twin engine installations, always check drive
shaft rotation before propel ler instal la tion. A right
hand rotation pro peller must be installed on the
star board propeller shaft. Similar ly, a left hand
prop must be installed on the port propeller shaft.
E - 5
ENGINE COOLING SYSTEMS
A. Raw Water Cooling
Certain stern drive and inboard engines utilize a raw
water cooling system. This 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
temperature 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) tempera-
tures.
NOTICE
Inboard boats utilize exhaust hoses to
relinquish cooling water. A periodic inspection
of the hoses, muffler and related parts should
be made to insure that leaks or heat
deterioration have not resulted. Replace them
as necessary.
Engines, Drives and Instrumentation - Section E
Never operate your engine without a
thermostat. Engine damage can occur and is
considered operator negligence and therefore
not covered under the engine warranty.
If engine should overheat, turn off engine,
look for obstructions to water pick-up. If any
obstructions are found, clear the obstructions
and run engine again at 1500 RPM in neutral
and check temperature gauge to verify
condition. If overheating still occurs, return to
port at low RPM to prevent excessive over-
heating and engine damage. Consult with
your certified engine dealer for service.
NOTICE
When laying up the boat for winter it is
important that the cooling system be flushed
with fresh water so that deposits do not dry and
to prevent the buildup of salt crystals. Please
consult your engine owner's/operator's manual
for proper engine and cooling system
winterization procedures.
B. Fresh Water Cooling
IPS drives along with certain V series inboards and
stern drive models include a "closed water cooling"
system. The fresh water system is the engines'
internal cooling system. The freshwater cooling
system ensures the engine operates at the correct
temperature. It is a "closed water cooling" system and
must be filled with a mixture of at least 40% concen-
trated coolant and 60% water to protect against
internal corrosion, cavitation and damage caused by
freezing.
This system provides adequate engine cooling without
exposing the internal engine to the detrimental effects
of surface water, including salt, highly polluted or
silt-laden water. The engine owners manual provides
addi tional infor mation regarding service and mainte-
nance of this equipment.
Models that use fresh water cooling also use surface
water as a cooling medium for the heat exchanger.
This seawater system is the boat's external cooling
system. Surface water may be used as a cooling
medium for such items as the control system oil
Owner's Manual Page 59
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