一辆吉林小货车发动机曲轴后油封严重漏油,更换油封后,发动机运转不到半小时又出现漏油现象。对曲轴及油封座作了仔细检查,未发现异常情况。在进一步检查曲轴箱通风管时发现,该通风管因内壁腐蚀剥落而被堵塞。更换通风管和装好油封后,故障排除。由此可见,该车曲轴后油封漏油的原因是:曲轴箱通风管堵塞,从气缸漏到曲轴箱内的气体无法排出,致使曲轴箱内压力越来越大,最终冲破曲轴后油 After a Jilin small truck crankshaft oil seal serious oil spills, replace the oil seal, the engine runs less than half an hour and the phenomenon of oil spills. Crankshaft and oil seal seat was carefully inspected, found no abnormalities. Upon further examination of the crankcase ventilation tube, it was found that the ventilation tube was blocked due to corrosion and peeling of the inner wall. Replace the ventilation pipe and installed oil seal, troubleshooting. Thus, the car crankshaft oil seal leakage after the reason is: crankcase ventilation tube blockage, leakage from the cylinder to the crankcase gas can not be discharged, resulting in increasing pressure on the crankcase, and ultimately break the crankshaft after the oil