Caracterização dos consequentes problemas ocasionados em sedes de válvula de escape do motor MARK 9 M20 – estudo de caso em uma retífica

Abstract

The valves are high precision elements. They are components of internal combustion engines, subject to high thermal and mechanical stresses. They are manufactured by different processes and used from low carbon materials to superalloys with valve seat shielding. This work uses qualitative methods such as the problem solving method and its tools, cause and effect diagram, 5 whys and action plan formulation, as well as technical methods such as electrochemical analysis and reverse cause analysis, all applied in the Search for a solution of failures and cracking in exhaust valve seats of a marine tug engine. It will be seen the use of concepts that deal with issues such as internal combustion engines, diesel, and also their head elements, some types of corrosion will be signaled as possible consequences for the problem raised, and will still be shown some characteristics of materials used in the Constitution of seats and valves. The project will investigate these technical concepts. Starting with the practical phase, firstly the dismantling of the 8 heads will be done, in addition to each of these components, in order to arrive at the cause of the engine failure, after that phase the qualitative characterization stage will be given, where they will be When using the troubleshooting tools to characterize the cause of the failure, the third step will be to seek scientific support for conducting chemical tests on the cooling fluid. Finally, it will be given the reassembly of the head assembly, made its seal and tests to prove

this, in addition to the expressed results of all the qualitative analyzes and physical- chemical tests, conclusions and references of the work given at the end