Regeneration of parts is the most correct form of use of worn out components and contributes, among others, to
reduce CO2 emissions. In the case of elements of fuel injector systems, very high precision is required and such
regeneration should be carried out using the original parts. It also requires testing on the original testing stands of
these manufacturers, which very often characterized by the fact that it is not possible to perform a short test, which
means that it is only possible to perform a time-consuming comprehensive test. An unquestionable advantage in some
cases would be the possibility of preliminary verification of the correct operation of the regenerated subassembly
without the need for a full time-consuming test. In the present situation, only after completing a time-consuming
comprehensive test of the diagnosed element of the injection system, it is often necessary to carry out its disassembly,
replacement or correction of one of the components and reassembly with the next time-consuming test. In the case of
low unemployment in the labour market, this is extremely unfavourable, and it is often not possible to organize work
in such a way that the diagnostic test of the subassembly takes place without the participation of an employee. On the
basis of the analyses presented in this article, carried out in the research and development department in company
whose employee is one of the co-authors, it can be stated that in the current situation on the labour market where
skilled workers are required to work and for the development of science is the most purposeful recognition of the
possibility of using vibroacoustic signals to shorten time of tests, which with a high probability may end in a negative
result. The preliminary analysis carried out, show that limitation of diagnostic time can be over 35%.
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