The thesis project was developed as part of an internship held at the FPT Industrial research and development center located in Turin, Italy. The objective was to follow the activities related to the certification process of a new developed marine diesel engine. The commercialization of marine engines must be accompanied by a certification procedure according to a classification society that in this particular case was assessed by the RINA (Registro Italiano Navale) corporation. The certification procedure must be followed to guarantee the correct engine design and construction for marine applications to attain a sound fabrication and the safety of life at sea.