换新件应将防锈油和蜡除掉一台桂花牌ＧＮ９１型手扶拖拉机大修时换了活塞、活塞销、缸套和活塞环等零件。装好后第一次起动比较困难，停放了一个晚上，第二天就再也摇不动。拆开检查，发现活塞环卡死在缸套内，油底壳的机油已全部变质。原来在装配时，新活塞、活塞销、缸... New parts should be anti-rust oil and wax should be removed A Guihua brand GN91 walking tractor overhaul for the piston, piston pin, cylinder liner and piston rings and other parts. After the first start is more difficult to install, parked for one night, the next day can no longer shake. Open the inspection and found that the piston ring stuck in the cylinder liner, the oil pan has all the deterioration of oil. The original assembly, the new piston, piston pin, cylinder ...