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Valve Lash

机译：气门鞭

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It never missed a beat until the altimeter in the little red-and-white Cessna 172 passed through 250 feet AGL. With a sudden loss in climb performance, the freshly overhauled Lycoming O-320-E2D spit and sputtered, giving up the effort with a final backfire and a wheezing cough. The engine failure was traced to improper intake valve guide selection. At the overhaul of the "straight valve" cylinders, the longer, "angle valve" intake guides were inadvertently used. While both are made of the same material and look virtually the same, the "angle valve" guide is longer by about 0.247 inch. This by itself is significant enough, but key is the operation of the engine with these guides installed. Standard mag and leak checks proved satisfactory and even engine ground-running at full power was normal. It wasn't until the engine reached 2550 rpm (with the forward motion of the aircraft) that the valve spring retainer keys began hitting the top of the guides.
机译：直到红色和白色的小塞斯纳172的高度计通过250英尺AGL之前，它从未错过任何节拍。由于攀爬性能突然下降，刚进行了大修的Lycoming O-320-E2D吐了水并溅了水，最终的事与愿违，喘着气喘吁吁地放弃了努力。发动机故障可归因于进气门导管选择不当。在“直阀”气缸大修时，无意中使用了较长的“角阀”进气导管。虽然两者均由相同的材料制成，并且外观几乎相同，但“角阀”导向装置的长度大约为0.247英寸。这本身就足够重要，但是关键是安装了这些指南的发动机的运行。标准的磁粉和泄漏检查证明是令人满意的，甚至在满功率的情况下发动机也可以正常行驶。直到发动机达到2550 rpm（飞机的向前运动）时，气门弹簧固定键才开始碰到导向装置的顶部。

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