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STORM series diesel engines (8-11 liter), which have been moved into production in 1986, were satisfying the initial development targets. But after the start of mass production, not only some troubles which had not been expected during development have occurred, but the governmental regulations of noise and emissions have been tightened year after year. To solve these problems, the improvement works of engine performance have been executed consistently, and the works of series extension were newly commenced. This paper describes the improvement works of STORM engine which have been done after their commencement of the production.