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 26.
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 exhaust
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 your engine does not operate properly,
refer to the Troubleshooting Chart or see
your 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 name, hull material, size (tons)
• Use, type of boating, number of hours run
• Total number of operation hours (refer to
hourmeter), age of boat
• Operating conditions when the problem
occurs:
- Engine rpm
- 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
TROUBLESHOOTING
66
6LY3 LDC Operation Manual
© 2008 Yanmar Marine International