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For the purpose of effective noise reduction, it is very important to understand the entire system of noise generation. So each noise source's contribution was analyzed in detail. Then the transfer paths and radiation surfaces of each noise source were analyzed. Combining all of the data, noise flow from sources to radiation surfaces became clear. Analysis results showed the importance of the main bearing structure. Several cylinder blocks with different main bearings were examined using a electro-hydraulic shaker. An actual engine was manufactured based on the shaker test results and about a 6dB(A) noise reduction was achieved. RECENTLY NOISE REDUCTION has become one of the primary goals of new engine development and an increasing amount of time and money is being spent to achieve this goal. For the purpose of effective noise reduction, it is very important to understand the entire system of noise generation. The noise generation system can be separated into three main phases.