柱塞副磨损后、柱塞与套筒的间隙增大、密封性能降低,导致供油压力降低,供油量减小,并使喷油提前角和延续角减小。这样就会引起发动机功率不足,并在怠速或低负荷时冒黑烟。柱塞副磨损后,临时应急的修复方法是:对于进、出油孔位置一样高的柱塞副,可将套筒旋转180°,使进油孔变为回油孔,回油孔变为进油孔。因为喷油泵长时间 After the plunger pair wear, the gap between the plunger and the sleeve increases, the sealing performance is reduced, resulting in reduced oil pressure, reduced fuel supply and reduced injection advance angle and continuation angle. This can cause insufficient engine power and black smoke at idle or low load. After the plunger pair wear, the temporary emergency repair method is: for the inlet and outlet positions as high as the plunger pair, the sleeve can be rotated 180 °, so that into the oil hole into the hole back into the oil hole becomes Into the hole. Because the fuel pump for a long time