一台检修后的S195型柴油机启动不着。经检查,发现气门回位困难,而导致气门回位困难的原因有两个:一是检修人员在安装气门杆与导管时,忽略了往气门杆上与导管内滴点机油,使气门杆与导管之间干摩擦; A maintenance of the S195 diesel engine can not start. After inspection, it was found that the valve back to the difficulties, which led to the valve back to the hardship for two reasons: First, maintenance personnel in the installation of the valve stem and catheter, ignoring the valve stem and the catheter dropping oil, the valve stem and Dry friction between catheters;