目前有些手扶拖拉机在使用中表现出耗油多,发动机没劲(马力不足),排气管冒黑烟等不正常现象.其原因很多,但多数是由于进、排气门磨损严重或烧蚀而造成漏气,从而导致汽缸内压缩比不足,故产生上述现象.进排气门漏气是否严重,一般的检查方法是拆卸气缸盖,将油注在气门上,观察油渗漏的快慢来判断气门是否漏气严重;或者用测试 At present, some walking tractors show many problems such as fuel consumption, lack of engine (lack of horsepower), black smoke on exhaust pipes, etc. There are many reasons for this, but most of them are due to severe abrasion or ablation of intake and exhaust valves Resulting in leakage, resulting in insufficient compression ratio in the cylinder, it produces the above phenomenon. Into the exhaust valve leakage is serious, the general method of inspection is to remove the cylinder head, the oil injected on the valve to observe the speed of oil leakage To determine whether the valve is a serious leak; or use the test