Stopping; Engine Working Range - Shanghai Diesel Engine SC9D Series Operation And Maintenance Manual

In the case of too high temperature of coolant, decrease engine speed or reduce load or take both until the
temperature recovers to the range of normal working conditions, otherwise, find the cause and trouble shoot the
problems as specified in Chapter V "Troubleshooting Guidelines".
Most failures will develop with a symptom. Observe the change of engine performance and sound of abnormality, or
check if one of following signs occurs. If so, it is necessary to repair it.
－misfire
－abnormal smoke
－abnormal vibration
－power loss
－abnormal noise
－increased oil consumption
－sudden change of oil pressure or coolant temperature
－increased fuel consumption
Warning: The engine will be damaged in case of running at overspeed (a speed exceeds the maximum
value under empty load).

3.3 Stopping

3.3.1 Normal shutdown
After full-load operation and before shutdown, gradually reduce the engine speed and load, and run the engine for
3~5 minutes at the idle to let turbocharger speed fall considerably and let the engine cool down gradually and evenly
so as to protect the turbocharger and engine.
Turn the start key switch to the OFF position.
Unless it is necessary, no emergency stop should be done while running under high loads, or serious failures will
occur due to overheating.
3.3.2 Emergency shutdown
Under an emergency or special condition, make an emergency stop to avoid serious engine failure. Manually pulling of the
emergency stop handle can achieve an emergency shutdown.

3.4 Engine Working Range

△Caution: The engine can operate with full throttle under the transitional working conditions at a speed above
the maximum torque speed, which is in line with recommended strategy for economical running. If the engine is
running with full throttle at a speed below the maximum torque speed for a long time, this will shorten the engine
service life, leading to overhaul or causing serious damage to the engine, which is treated as an abuse behavior.
△Caution: The engine will operate at a speed below the maximum torque speed during shifting gears. This is due
to different transmission ratios among transmission gears. However full-throttle running at a speed below the
maximum torque speed shall not be longer than 1 minute.
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