Engine Shut-Down - Yanmar 3YM20 Operation Manual

3. OPERATION
(5) Is there water, oil, or gas leakage, or
are there any loose bolts?
Check the engine room periodically for
any problems.
(6) Is there sufficient fuel oil in the fuel
oil tank?
Replenish fuel oil in advance to avoid
running out of fuel during operation.
(7) When operating the engine at low
speed for long periods of time, race
the engine once every 2 hours.
Note: Racing the Engine
With the clutch in NEUTRAL, accelerate from
the low speed position to the high speed po-
sition and repeat this process about 5 times.
This is done to clean out carbon from the
cylinders and the fuel injection valve. Ne-
glecting to race the engine will result in poor
exhaust color and reduce engine perfor-
mance.
(8) If possible, periodically operate the
engine at near maximum rpm.,
while underway. This will generate
higher exhaust temperatures,
which will help clean out hard car-
bon deposits, maintaining engine
performance and prolonging the
life of the engine.
NOTICE
Electric Operation
Never turn off the battery switch
during operation. Damage to parts
in the electric system will result.

3.3.5 Engine shut-down

Stop the engine in accordance with the fol-
lowing procedures:
(1) Put the remote control handle in
NEUTRAL
(2) Be sure to race the engine before
shut-down. (See 3.3.4 (7))
(3) Cool down the engine at low speed
(approximately 1000 rpm) for about
5 minutes.
NOTICE
Always remember to allow engine
to idle below 1000 rpm for five min-
utes prior to shut-down to remove
heat from major components.
Shutting down the engine suddenly
while operating at high speed will
cause the engine temperature to
rise quickly, causing deterioration
of the oil and sticking of parts.
Electric stop device
Push the stop button on the instru-
ment panel when the key is in the ON
position.
Engine shut-down by stop button
A
A Stop button on the instrument panel
(4) Close the fuel cock.
(5) Close the sea cock.
NOTICE
Neglecting to close the seacock
could allow water to leak into the
boat and may cause it to sink. Be
sure to close the seacock.
EN
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