This paper presents the investigation into the actual performance of marine diesel generator engines, The following conclusions are obtained;
1. The allowable maximum load of the engines has been limited between 60 and 70% of the rated output in less than several years after launching.
2. The maximum load is limited by an upper bound of an exhaust gas temperature at a cylinder exit, which is set up at 400°C in the investigation.
3. The reduction of the maximum load is caused by a secular change of an engine, which produce gradual increase of the exhaust gas tempreature.
These results suggest the necessity of counter-measures to a new-built ship to decrease exhaust gas temperatures and to employ higher power ratio of a diesel engine to a generator.
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