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This research aims to show a way to use the reliability study as a tool to guarantee the improvements in a product design. To reach the goal, a improvement in a oil seal was executed through the study of its reliability and using the value engineer technique. This study aims to show the relationship between the field information and functional tests. Through the analysis of field information, the functional characteristic that must be improved in the product was selected, and the value engineering technique application result in an element that must be improved in a product. The reliability study after and before the change in product, together with functional tests showed the efficiency of the change in the product aimingat improving its operational life. Key-words: Reliability. Field information. Value engineer. Functional test. Oil Seal.

Aperfeiçoamento de um produto através do estudo de sua confiabilidade como um fator de valor.