近日有两位机手的小四轮因烧机油并且冒黑烟而送到某修理部修理.修理工按贯例更换气缸套、阻水圈、活塞、活塞环、气门、气门导管等易损件.装好后试机,勉强可以起动,但不久水箱里即冒起大量气泡,导致发动机自行熄火.拆除检查发现,是气缸套顶部凸肩断裂,认为是气缸套质量问题,马 Recently, there are two small hands of the four drivers for burning oil and black smoke and sent to a repair department repair. Repair workers according to consistent replacement cylinder liner, water block, piston, piston rings, valves, valve guides and other wearing parts After the installation of the test machine, barely can be started, but soon a lot of bubbles in the tank, causing the engine to turn off .Remove the inspection found that the top of the cylinder liner shoulder rupture, that the quality of the cylinder liner, horse