Yanmar 3JH4E, Service Manual

Page: 118 / 350

2. Inspection and adjustment
98
2.6.3 Check points and precautions during running
Step Item Instructions Precautions
1 Checks before
operation. 1) Make sure that the sea cock is open.
2) Make sure there is enough lube oil and (fresh)
coolant.
3) Operate the remote control handle and check if the
device connected to the engine works property.
3) Lamp should go off
when engine is
running.
2 No load operation;
warm up operation. 1) When the lube oil temperature is raised to allow
the engine to start, the pilot lamp goes off.
2) When the engine is started, check the following:
• There is no leakage of water, fuel and lube oil.
• Exhaust gas does not leak when the engine is
started.
• There is no abnormal indication on the instrument
panel.
• There is no abnormality in coolant discharge,
engine vibration or engine sound.
3) To warm up the engine, operate at low speed for
about 5 minutes, then raise the speed to the rated
speed and then to max. speed.
2)
• Fit leaks if any.
• Check the intake/
exhaust valves, fuel
injection nozzle and
cylinder head.
3) Do not raise the
engine speed
abruptly.
3 Cruising (load)
operation. 1) Do not operate the engine at full load yet, but raise
the speed gradually for about 10 minutes until it
reaches the rated speed.
2) Make sure that exhaust gas color and temperature
are normal.
3) Check the instrument panel and see if the water
temperature and oil pressure are normal.
4 Stopping the
engine. 1) Before stopping the engine, operate it at 800-850
min
-1
for about 5 minutes.
2) Raise engine speed to 1,800 min
-1
jut before
stopping the engine and idle the engine for about
3-4 seconds.
1) Stopping the engine
suddenly during high
speed operation
increases the
temperature of
engine parts.
2) This procedure
prevents carbon
from being deposited
on the valve seats,
etc.
5 Checks after stop-
ping the engine. 1) Check again for water and oil leaks.
2) Make sure that no nuts and bolts are loose.
3) Close the sea cock and fuel cocks.
4) When the temperature is expected to fall below
freezing, drain the seawater.
5) Turn off the battery switch.
1) Check the oil seal
area.
2) Especially the
engine installation
bolts.
4) Drain from the
seawater pump.