Yanmar 4JH110, Operation Manual

Page: 112 / 160

TROUBLESHOOTING
104
JH Series Operation Manual
Is there water, oil or fuel leakage? Are
there any loose bolts or connections?
Check the engine room daily for any leaks
or loose connections.
Is there sufficient fuel in the fuel tank?
Refill fuel in advance to avoid running out
of fuel. If the tank runs out of fuel, bleed
the fuel system.
See Bleeding the Fuel
System on page 40 .
When operating the engine at low speed
for long periods of time, race the engine
once every 2 hours. Racing the engine
with the clutch in NEUTRAL, accelerate
from the low-speed position to the
high-speed position and repeat this
process about five times. This is done to
clean out carbon from the cylinders and
the fuel injection valves.
NOTICE
Neglecting to race the engine will result in
poor smoke color and reduce engine
performance.
Periodically operate the engine near
maximum speed while underway. This will
generate higher exhaust temperatures,
which will help clean out hard carbon
deposits, maintain engine performance
and prolong the life of the engine.
TROUBLESHOOTING
INFORMATION
If the engine does not operate properly,
refer to the
Troubleshooting Chart on page
105
or consult authorized Yanmar Marine
dealer or distributor.
Supply the authorized Yanmar Marine
dealer or distributor with the following
information:
• Model name and serial number of your
engine
• Boat model, hull material, size (tons)
• Use, type of boating, number of hours
run
• Total number of operation hours (refer to
hour meter), age of boat
• The operating conditions when the
problem occurs:
• Engine speed (min
-1
)
• Color of exhaust smoke
• Type of diesel fuel
• Type of engine oil
• Any abnormal noises or vibration
• Operating environment such as high
altitude or extreme ambient
temperatures, etc.
• Engine maintenance history and
previous problems
• Other factors that contribute to the
problem
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