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Design of an efficient cooling system for new generation engines has become a critical task, which requires to be handled optimally at the design stage itself. This approach helps in minimizing the optimization trials, saving time and cost for finalization of patterns and castings. Study of water jacket core in the engine cylinder head and block is of complex nature. Shape, size and location of transfer holes play a vital role in judging the eddies formation and hot spots. It is required to eliminate the hot spots, thus improving cooling efficiency and durability of the component. Use of CFD technique is found to be an effective design tool while dealing with such kind of complex flow problems. In this paper, effective utilization of FIRE CFD code is described for water jacket design of a modular two-cylinder diesel engine being developed from scratch.