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cooler, fuel cooler, intercooler, engine oil cooler and
heat exchanger. Depending on the model, The cooling
water employed enters the system through a water
intake on the drive-unit or thru-hull water intake
scoops. It is relinquished through the exhaust pipe
elbow where it is mixed with the exhaust gases.
These types of intakes have an external strainer. Be
sure strainers are kept free of mud, weeds and other
debris. Some boating areas require that additional
water intake filters be installed. Refer e nce Section P-3
- Equipment Installation, in this manual for installa tion
instruc tions and consult your Four Winns dealer
regard ing any special equip ment that may be re-
quired.
A gate valve or seacock is provided at each engine
intake 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 en gine in take or an ex ha ust or cool ing
hose rup ture, turn the en gine off and close the
seacock immediately. Proceed under tow if
neces sary to a service facility for appropriate
repairs. Maintain a close visual watch on the
prob lem hose and also on the bilge water level.
E - 6
RUNNING ANGLE & POWER TRIM/
TILT
Hull planing surfaces have the least amount of drag at
a three to five degree angle with the water. This is the
pre ferred running angle when boating. The running
angle has a signifi c ant impact on top speed and
handling. Heavy load or certain water conditions may
make it difficult to achieve the optimum running angle.
See Figure E5.
Engines, Drives and Instrumentation - Section E
The running angle can be controlled through the use
of power trim (stern drives) and/or trim tabs. See
Section E-7 - Trim Tabs and Section S-7 - Trimming
Your Boat for information on the use of trim tabs and
tilt/trim control switches.
Figure E5: Running Angle
A. Power Trim
Trim angle is how far in or out, the lower unit is
positioned in relation to the bottom of the boat. The
trim angle of the lower unit has a distinct affect on the
running angle of the boat.
The power trim system permits control of the trim
angle of the drive unit relative to the boat, at the touch
of a button.
It allows the drive unit to be raised (trimmed out) for
shallow water opera tion. Power trim also allows the
operator to adjust the drive unit while under way to
provide the ideal running angle for a given load and
water condi tion. Addi tional infor mation can be found
in the engine owner's manu al.
Owner's Manual Page 60
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