通过模拟柴油机气阀机构的两种常见的主要故障：气阀漏气和气门间隙异常。
By simulating two kinds of main fault of a valve train, which are the gas leak and abnormal lash, the vibration signals of a cylinder head have been measured.
该仪器通过测量柴油机缸盖表面的振动信号，提取特征参数，对柴油机的气阀漏气与间隙异常进行诊断。
The instrument measures vibration signal of diesel cylinder header, extracts the characteristic parameters, to diagnosis for fault of leakage and abnormal space of valve.
进气阀和排气阀密封有问题也会造成压缩时漏气。
The intake or exhaust valves are not sealing properly, again allowing a leak during compression.
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