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一台新购的东风-12型手扶拖拉机使用两天后,发生起动困难的故障。加油门摇动曲轴,感到气缸压缩良好。但听不到喷油声。以为喷油嘴不喷油,更换新喷油嘴后情况依旧,接着又更换了柱塞副,仍然无济于事,经检查发现,低压油路正常,而从喷油泵出油阀紧座泵出来的燃油量少,压力低。问题出在出油阀紧座与出油阀痤之间的塑料垫圈上,垫圈的厚度不够,造成出油阀座压下紧,泵油无力。用牙膏皮剪了4个垫圈,加在塑料垫圈下面,起动性能恢复正常。
A new purchase of Dongfeng -12-type tractor after using two days, the occurrence of difficult start-up failure. Grip the crankshaft, feel the cylinder compression is good. But can not hear the fuel injection sound. That the nozzle is not fuel injection, after the replacement of the new nozzle remains the same, then replaced the plunger pair, still no use, after inspection found that the low-pressure oil is normal, and from the injection pump out of the valve seat pump fuel Low volume, low pressure. The problem lies in the plastic valve seat between the seat and the oil valve acne gasket, gasket thickness is not enough, resulting in the valve seat pressed tight, pump oil weakness. Toothpaste cut 4 washers, added under the plastic washers, starting performance returned to normal.