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Noise, Vibration and Harshness (NVH) are the major issues in today's modern diesel engine. The reciprocating movement of the piston and connecting rod, combined with the rotating movement of crankshaft generates inertial forces that act on the engine block and cause it to vibrate in different planes. An important key in the working engine is the first-order and second-order inertial forces which cause high amplitude excitation of vehicle structure and leads to interior noise and riding discomfort to the driver. In our study of four cylinder engine configuration, secondary inertial forces are the main cause of vibration acting in vertical direction. This paper focuses on the elimination of secondary inertial forces by using twin balancer shaft rotating in opposite direction at twice the crankshaft speed. A 100hp four cylinder in-line diesel tractor engine is used in our study where the modeling of balancer shaft is done using UNIGRAPHICS. FEA using ANSYS is performed to check for its maximum stress developed on the balancer shaft and also modal analysis is carried out to check for its resonant frequency. Finally the multi-body dynamics using ADAMS is performed resulting in 95% secondary balancing.