Isuzu AU-4LE1T, Maintenance Manual

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5. ENGINE STOPPING
1) Make sure that all of the control levers on the equipment are in
NEUTRAL position.
2) Before stopping the engine, cool down the engine by operating it at low
idle speed about three minutes.
In this operation, check the engine noise and the engine oil pressure
for abnormalities.
CAUTION:
In the turbocharged engine, if the engine is stopped
instantaneously, a dry condition produced by high temperature
will take place in the turbocharger rotating parts which may
cause lack of lubrication. This will result in turbocharger
failure.
3) To stop the engine, turn the starter switch key to OFF position. The
engine stop solenoid automatically shut off the fuel to stop the engine.
Switch off the battery (if so equipped).
CAUTION:
Leaving the starter switch key in the DRIVE position for a long
while after the engine has been stopped, will discharge the
batteries wastefully.