When an engineering ship is under heavy load,there is shafting runout and oil/water leakage at the seal of the stern tube.To solve these problems,this paper installs an extra bearing in front of each stern tube at the portside and starboard.During the installation of the bearings,this paper solved the eccentricity of the front bearing seat of the starboard stern tube by machining the bearing seat and embedding a new sleeve into it with the dry ice freezing method.After the installation,each bearing of the shafting with the jack-up method,showed that each bear-ing load was reasonably distributed.During the sea trial and many high-load projects,there were no shafting runouts or oil/water leakages,which fully demonstrated that the installation of extra bearings was reasonable and effective.
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