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一台使用了近2年的工农-12型手扶拖拉机,柴油机工作无力,排气冒黑烟。机手更换了气缸套、活塞环、进、排气门、针阀偶件及柱塞偶件后,仍无济于事。经过我们认真分析,初步判断问题可能出在排气系统。拆下排气管和消音器后,柴油机工作即恢复正常。从排气管清除积炭足有一大碗。造成此故障的原因是:机手为改变消音器排气口方向,增加了排气管道的长度和弯头,致使排气阻力增大,排气不净,燃烧不良冒黑烟,工作无力。另一台使用仅1个月的工农-12型
A used worker-peasant-12 type walking tractor used for nearly two years, the diesel engine is weak and the exhaust smoke black smoke. After the replacement of the cylinder liner, piston rings, into, exhaust valve, needle valve and plunger parts, still no use. After careful analysis, we may initially judge the problem in the exhaust system. After removing the exhaust pipe and muffler, the diesel engine will resume normal operation. There is a large bowl of carbon removed from the exhaust pipe. The reason for the failure is as follows: The hand machine changes the direction of the exhaust port of the muffler, increases the length of the exhaust pipe and the elbow, resulting in increased exhaust resistance, poor exhaust gas, poor combustion and black smoke, and weak work. Another one worker-peasant-12 type that uses only one month