我场一台东方红—75拖拉机做完四号保养,试运转正常即投入作业。工作两个班发现气门室罩盖温度过高,打开一看,里面没有一点机油。经检查缸盖衬垫正常;机油压力正常,那么通往气门机构的油路何处堵塞?问机车人员保养搞了一些什么项目,说一切按规则进行,只是换了一根新凸轮轴,而保养前气门机构供油正常。看来气门机构没油与新凸轮轴有关。拆开定时齿轮室盖发现凸轮轴前串一厘米多,而其正常轴向间隙 My field a Dongfanghong -75 tractor finish the fourth maintenance, commissioning normal operation. Two classes of work found that the valve cover hood temperature is too high, open a look, there is no point of oil. After checking the cylinder head gasket normal; oil pressure is normal, then leading to the valve mechanism of the oil where the plug? Ask the locomotive maintenance engage in something, say everything according to the rules, but for a new camshaft, and Valve body maintenance before the normal oil supply. Valve mechanism seems no oil and the new camshaft. Open the timing gear chamber cover found camshaft front string more than one centimeter, and its normal axial clearance