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一台长春-12型小四轮拖拉机冷车起动正常,而热车起动困难。检查供油提前角、气门间隙和喷油器均正常。经分析认为,可能是缸套上缘有细小裂纹,热车时缸套受热膨胀,裂纹扩大,气缸漏气,导致热车起动困难。最后在热车时拆下缸盖检查,果然发现缸套上缘有一个6毫米长的裂纹。更换缸套后,故障排除。一台长春-12型小四轮拖拉机,在调整供油提前角后连续损坏了两个喷油泵体。第一个泵体的损坏是因驾驶员在调整供油提前角时,将泵体与机体之间的纸垫减光
A Changchun -12 small four-wheel tractor cold car started normal, and hot car start difficult. Check fuel advance, valve clearance and injector are normal. The analysis shows that there may be fine cracks on the upper edge of cylinder liner, hot cylinder liner thermal expansion, crack expansion, air cylinder leakage, resulting in hot car starting difficulties. Finally, remove the cylinder cover when hot car check, it was found on the edge of the cylinder liner has a 6 mm long crack. After replacing the cylinder liner, troubleshooting. A Changchun -12 small four-wheel tractor, after adjusting the fuel supply advance angle after the continuous damage to the two injection pump body. The first pump is damaged due to the driver adjusting the fuel supply advance angle, the paper between the body and the body pad dimmer