Yanmar 3JH3(8)E - Cautions During Operation; Stopping the Engine

3. Operation
3.3.4 Cautions During Operation
Always be on the lookout for problems
during engine operation.
Pay particular attention
to the following:
(1) Is sufficient water being discharged
from the seawater
outlet pipe?
If the discharge is small, stop the engine
immediately, identify the cause and repair.
(2) Is the exhaust colour normal?
The continuous emission of black exhaust
indicates engine overloading. This
shortens the engine's life and should be
avoided.
(3) Are there abnormal vibrations or
noise?
Depending on the hull structure, engine
and hull resonance may suddenly become
great at a certain engine speed range,
causing heavy vibrations. Avoid operation
in this speed range. If you hear any
abnormal sounds, stop the engine and
inspect.
(4) Alarm buzzer sounds during
operation.
If the alarm buzzer sounds during opera-
tion, lower the engine speed immediately,
check the warning lamps, and stop the
engine for repairs.
(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, accel-
erate from the low speed position to
the high speed position and repeat
this process about 5 times. This is
done
to clean out carbon from the
cylinders and the fuel injection
valve.
Neglecting
to race the engine will
result
in poor exhaust colour and
reduce engine performance.
NOTICE
Electric Operation
Never turn off the battery switch
or spark the battery
cable during
operation. Damage to parts
in the
electric system will result.
3.3.5 Stopping the Engine
Stop the engine in accordance with the
following procedures:
1. Put the remote control handle in
NEUTRAL.
2. Be sure to race the engine before
stopping it. (See 3.3.4
(7))
3. Cool down the engine at low speed
(approximately
1000 rpm) for about 5
minutes.
NOTICE
Stopping 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.
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