In this paper, we study the trouble diagnosis of diesel valve train by sound intensity, especially by the technique of the Gated Spectrum Analysis. To check the efficiency and reliability of our sound intensity measurement, we record vibration signals and sound intensity simultaneously to diagnose the valve train troubles of the 290-QN diesel. Some typical troubles with the valve train are analogued, the frequency spectrum plots of the vibration signals and sound intensity signals are gotten with the help of the tape recorder which record the signals in situ, so we could identify the troubles of the valve train from these frequency spectrum plots directly.

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