Yanmar 4LHA-DTP, Operation Manual

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4.6 Check During Operation
Always be on the look out 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 black exhaust smoke shows engine overloading.
This shortens the engine's life, so 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.
How to Race the Engine
•Morse Remote Controi Handle
Pull out the handle lever (MT-3) or the free
throttle button (MV) and shift the engine
speed from high to low several times.
Racing the engine removes carbon built up in
the combustion chamber and around the fuel
injection valve.
Neglecting to race the engine will become poor
snoke color and drop engine performance.
^NOTICE]
Never turn off the battery switch or
spark the battery cable during opera-
tion. Damage to parts in the electric
system will result.
NEUTRAL A. NEUTRAL
^ O ^ X ^ l Free throttle
"^/ifc-.. \\ / button
Pull out the handle lever Pull out free throttle button
MT-3 MV
- 3 7 -