Check During Operation - Yanmar 4JH3-TE Operation Manual

30 4. HOW TO OPERATE

4.6 Check 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 color normal?
The continuous emission of black exhaust shows engine overloading.
This shortens the engine's life and should be avoided.
(3) Are there abnormal vibrations or noise?
Do not operate at speeds which produce violent vibrations.
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 operation, lower the engine speed immediately, check the alarm 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 oil in the fuel 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.
Racing the Engine
♦ ♦ ♦ ♦ Morse Remote Control Handle
Pull out the handle lever (MT-3) or the free throttle but-
ton (MV) and shift the engine speed from high t to low
several times.
Racing the engine removes carbon built up in the com-
bustion chamber and around the fuel injection valve.
Neglecting to race the engine will cause the exhaust to
turn black and lower the efficiency of the engine.
NOTICE:
Never turn off the battery switch or spark the
battery cable during operation.
parts in the electric system will result.
NEUTRAL
→See 4.3.4(1)
Pull out handle lever
Damage to
Battery Switch
OPTION
NEUTRAL
Pull out free throttle button
MT-3
ON
Free throttle button
MV
OFF