Shutting Down The Engine; Normal Shutdown - Yanmar 4JH45 Operation Manual

ENGINE OPERATION
Racing the engine: With the gear 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 valve. Neglecting to race the
engine will result in poor smoke color
and reduce engine performance.
• If possible, periodically operate the
engine at near maximum engine speed
while underway. This will generate
higher exhaust temperatures, which will
help clean out hard carbon deposits,
maintaining engine performance and
prolonging the life of the engine.
Never turn off the battery switch (if
equipped) or short the battery cables
during operation. Damage to the electric
system will result.
52
SHUTTING DOWN THE
ENGINE

Normal Shutdown

1. Reduce engine speed to low idle and
put remote control handle in NEUTRAL.
2. Accelerate from low speed to high
speed and repeat five times. This will
clean out the carbon from the cylinders
and the fuel injection nozzles.
3. Allow engine to run at low speed
(approximately 1000 min
load for 5 minutes.
For maximum engine life, Yanmar
recommends that when shutting the
engine down, you allow the engine to
idle, without load, for 5 minutes. This will
allow the engine components that
operate at high temperatures, such as
the turbocharger (if equipped) and
exhaust system, to cool slightly before
the engine itself is shut down.
Figure 4
4. Push and hold the stop switch.
After the engine has stopped, push the
power switch off.
JH Series Operation Manual
-1
) without
Start switch
Stop switch
Power switch
042590-01EN01