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在原6L250GZC－Ⅱ型柴油机的基础上，通过加长行程、改进增压系统、匹配先进的增压器、选择合适的平均有效压力和最高燃烧压力、改进燃油系统、提高燃油喷射压力、优化供油规律和喷油规律并选择合适的燃烧室，使燃油、空气在燃烧室中达到较理想的混合和燃烧，从而达到增加功率、降低油耗、改善排放、提而各项性能指标的要求。改进后的L2502系列柴油机在国内处于领先水平。
On the basis of the original 6L250GZC-Ⅱ diesel engine, by improving the stroke, improving the pressurization system, matching the advanced turbocharger, selecting the appropriate average effective pressure and the maximum combustion pressure, improving the fuel system, increasing the fuel injection pressure and optimizing the fuel supply rule And fuel injection law and select the appropriate combustion chamber, the fuel, air in the combustion chamber to achieve the desired mixture and combustion, so as to increase power, reduce fuel consumption, improve emissions, mention the performance requirements. The improved L2502 series diesel engine is leading in the country.