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The main challenge in today's modern diesel engines is to design the parts, which should withstand higher temperatures. To achieve this, selection of materials and tolerances are very important. The product identified for this study is an oil pump, which is an engine auxiliary component. The function of oil pump is to supply oil to different parts of the engine to lubricate and reduce the overall engine friction. The different speed and load condition for which the engine is subjected pose a challenge to the oil pump, to supply necessary quantity of oil at required pressures. Normally, the oil pump is subjected to a temperature of 120°C at higher speeds. However, the peak oil temperature in modern diesel engines can be as high as 140°C. When the existing pump was tested at full speed and suddenly decelerated to idle speed, it was observed that the minimum oil pressure was not maintained for engine lubrication.