After 6 000 hours of operation of the low-speed marine diesel engine,crack damage occurred on the oil sump,and it needs to enter the shipyard for replacement maintenance.The large volume and weight and con-fined space inside the engine caused difficulties in maintenance.After the analysis on the structure of both the hull and the engine,this paper put forward a program of lifting the upper part of the engine to separate it from the oil sump and opening an auxiliary hole on the front wall of the chamber.The replacement of oil sump is rare in the ship repair industry,and this paper provided a new train of thought for the replacement work of oil sump of marine diesel en-gines.
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