故障一:某厂一台黄河JN162型载货汽车,大修后行驶不到3000千米即发生了烧瓦故障。据查,修理工在调试该车发动机(X6130型柴油机)所配用的P型喷油泵时,发现原柱塞套与泵体座孔间的两道“O”形密封圈老化破损,随手用一块橡皮板制作了密封圈装复使用。由于所用的橡皮板是普通橡皮,在油的腐蚀作用下很快失效,造成油泵低压油室内的柴油渗漏到凸轮轴室。因为P型泵采用的是强制润滑方式,凸轮轴室与油底壳相通,渗漏的柴油冲淡了润滑油, Fault one: a factory a Yellow River JN162 truck, driving less than 3000 km after the repair that occurred in the tile failure. According to the investigation, the mechanic found that when the P-type injection pump equipped with the X6130 diesel engine was used, the two “O” type seals between the original plunger sleeve and the pump body bore were aged and damaged, Rubber plate made of the seal used to re-use. Since the rubber plate used is a common rubber, it quickly fails under the action of oil corrosion, causing the diesel oil in the low-pressure oil chamber of the oil pump to leak into the camshaft chamber. Because the P-type pump is forced lubrication, the camshaft chamber and the oil pan connected to the leakage of diesel diluted oil,