Measuring and evaluating method for a vibration of the internal combustion engine is highlydeveloped through measuring machine histories - such as from the mechanical type to the electrictype with a piezoelectric element as a transducer, and to the more improved type with a built-in FFTwhich can be analyzed into a frequency level. However, it has not been reached enough level quicklyto measure/evaluate at the site. We started to investigate in 1993(H.5)how the vibration of a combustion diesel/gas engine withaΦ l60mm to 300mm cylinder influenced on required accessories as a damage, and tried to developa new vibration indicator for an actual operation use, which was introduced a measuring/evaluatingmethod using the 'vibration Severity Grade1 that ISO was reviewing at that time. New vibrationindicator were adopted to some factories for their outgoing inspections and got good results.Followings are the histories and results of it.
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