我厂生产的170柴油机曾一度出现过气门室盖内无机油雾现象,使摇臂轴和套、气门和导管得不到机油润滑,造成摇臂轴套磨损过快,气门导管易断、咬气门等故障。为了解决这个问题,我们做了气压试验。我们首先制作了一副“U”型管气压计,分别测试了进气道、气门室盖和机体内部压力。发现机体和气门室盖内压力与加油螺塞呼吸片结构有很大关系。目前生产用的加油螺塞呼吸片是一个2毫米厚的塑料片 I produced 170 diesel engine once appeared in the valve chamber cover the phenomenon of inorganic oil mist, the rocker shaft and sleeve, valves and catheters are not oil lubrication, resulting in excessive wear on the rocker shaft sleeve, the valve easy to break the catheter, bite Valve and other failures. In order to solve this problem, we made a pressure test. We first made a “U ” type barometric pressure gauge, respectively, to test the intake port, valve cover and body pressure inside. Found that the body and the pressure in the valve chamber lid with the structure of the gas pump plug has a great relationship. The current production of the fuel plug snorkel is a 2 mm thick plastic sheet