Yanmar 3JH4E Operation Manual page 84

TROUBLESHOOTING
• 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 30.
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
the 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.
78 JH4 Series Operation Manual