Installation
30
4.
Mount the outboard motor on the center
line (keel line) of the boat, and ensure
that the boat itself is well balanced. Oth-
erwise the boat will be hard to steer. For
boats without a keel or which are asym-
metrical, consult your dealer.
EMU26925
Mounting height
To run your boat at optimum efficiency, the
water resistance (drag) of the boat and out-
board motor must be made as little as possi-
ble. The mounting height of the outboard
motor greatly affects the water resistance. If
the mounting height is too high, cavitation
tends to occur, thus reducing the propulsion;
and if the propeller tips cut the air, the engine
speed will rise abnormally and cause the en-
gine to overheat. If the mounting height is too
low, the water resistance will increase and
thereby reduce engine efficiency. Mount the
outboard motor so that the anti-cavitation
plate is between the bottom of the boat and a
level 25 mm (1 in) below it.
NOTICE
ECM01634
●
Make sure that the idle hole is high
enough to prevent water from entering
the engine even if the boat is stationary
with the maximum load.
●
Incorrect engine height or obstructions
to the smooth flow of water (such as the
design or condition of the boat, or ac-
cessories, such as transom ladders or
depth finder transducers) can create air-
borne water spray while the boat is
cruising. If the outboard motor is operat-
ed continuously in the presence of air-
borne water spray, enough water could
enter the engine through the air intake
opening in the top cowling to cause se-
vere engine damage. Remove the cause
of the airborne water spray.
TIP:
●
The optimum mounting height of the out-
board motor is affected by the boat and mo-
tor combination and the desired use. Test
1. Center line (keel line)
ZMU01760
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U6DR70E0.book Page 30 Thursday, December 6, 2012 9:14 AM
