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The Objective of the work is to upgrade existing series of multi cylinder DI turbocharged intercooled diesel engines to meet revised stringent Stage-II emission norms for diesel genset application. In this engine tuning activity, focus is given on optimization of engine without any major modification on engine design features. In recent years, the demand use and penetration of diesel operated generating sets for the power generation application has sharply rise in India. These sharp rises in the DG engines have made the high impact on pollutants emitted by these sets. Hence, concerned authorities have first enforced the limits on the pollutants emitted by these sets in the year 2004. Further these emission limits were tightened recently and reduced the emissions from diesel engines. Concerned authorities implemented the revised emission norms with effective from July 2014. The reduction in NOx+HC emission is around 62% for the engines having rated power above 75 kW.