Engine Overheat Warning System - Yamaha AR240 HO Owner's Manual

ENGiNE OVERHEAT
WARNiNG SYSTEm
This model is equipped with an engine
overheat warning system. If the engine
starts to overheat, "ENGINE OVER
TEMP" will appear on the LCD display
of the affected engine. The buzzer also
begins to sound. The engine speed is
automatically limited to help prevent
damage. If this occurs, immediately re-
duce the engine speed, return to shore
or maneuver to a safe location, and
check for water discharge at the cool-
ing water pilot outlets.
Each engine is equipped with cooling-
water pilot outlets  on the starboard
side of the hull. The port side engine is
the one closest to the bow. Check that
water comes out of the outlet while the
engine is running, particularly while ap-
plying throttle. If you do not see any wa-
ter at the outlet, cooling water may not
be circulating in the engine.
Tip:
If water cooling passages on the
engines are dry, it will take about 20
seconds for water to reach the pilot out-
lets after starting.

f
eatureS
If water is not circulating, something
may be clogging the jet intake grate.
Refer to the Jet Pump Clean-Out
procedures on page 5-5 for further
information.
if the cause of overheating cannot
be found and corrected, take special
precautions to avoid major engine
damage while you return to shore.
SiNGLE ENGiNE
— Shut off the overheating engine
and use the properly running engine
to return to shore. Operate at "no
wake" speed to prevent water from
flooding the non-operating engine
through the cooling water intake.
See page 2-15 for "No Wake mode"
system operation.
BOTH ENGiNES OVERHEATiNG — if
getting a tow from another vessel is
not possible, operate both engines
just slightly above idle while you re-
turn to shore. if you can be towed,
refer to "Towing the boat" on page
5-3.
Tip:
Press either the m or T button on the
tachometer to stop the buzzer.
2-13
& f
unctIonS
OVERHEATiNG
2