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.
gear unit of the stern drives models. Water pumped to
the engine by the seawater pump is circulated through
the engine by the engine circulating pump. A thermo-
stat controls the engine operating temperature by
determining the amount of water to be taken in,
recirculated and discharged. The water is discharged
through an idle exhaust relief and the exhaust through
the propeller hub. A temperature gauge(s) located
on your instrument panel monitors engine(s)
The load carried in a boat will directly affect perfor-
mance of the engine. If an engine that is not develop-
ing full power, be sure the engine is properly tuned
and load conditions are those normally experienced,
before changing propellers.
Never operate your engine without a
For shipping reasons, the propellers are not factory
installed. Initial installation of the propellers will be
performed by the dealer during pre-delivery service.
Consult your speciﬁc engine manufacturer’s owner’s
manual for propeller installation instructions. See
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.
Front Propeller Nut
Rear Propeller Nut
Figure E3: Duo Prop Installation
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
Should it be necessary to change propellers,
always 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.
B. Fresh Water Cooling - Optional
Be sure the propellers are of the correct blade con-
ﬁguration, diameter, 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.
An available option on certain 338 Vista stern drive
engines models is a “closed water cooling” system.
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
additional information regarding service and mainte-
nance of this equipment. See your Four Winns dealer
E - 5 ENGINE COOLING SYSTEMS
A. Raw Water Cooling
Most of the 338 Vista® stern drive 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
Engines, Drives and Instrumentation - Section E
Owner’s Manual Page 56
|Categories||Four Winns Manuals, Four Winns Vista Manuals, Outboard Marine Corporation Manuals|
|Tags||Four Winns Vista 338|
|Model Year||2007, 2008|
|Document Type||Owner's Manual|
|Product Brand||Boats and Cruisers, Four Winns. For support contact your dealer at http://www.fourwinns.com/locate-dealer.aspx|
|Document File Type|
|Wikipedia's Page||Outboard Marine Corporation|
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