拖拉机、小四轮等农用运输车的配气机构,在作业时常出现的问题及对策是: 1.气门关闭不严 表现为气缸压缩力减小,发动机起动因难;发动机冒黑烟,功率下降;不减压摇转曲轴,可听到漏气声。原因及对策:①若因气门与气门座之间有积炭或烧蚀,轻者可进行研磨,重者应先 Tractors, small four-wheeled and other agricultural vehicles with gas agencies, often appear in the operation of the problem and countermeasures are: 1. Valve lax performance for the cylinder compression force decreases, the engine start due to difficulties; engine black smoke, the power down ; No decompression crankshaft, can hear the sound of leakage. Causes and Countermeasures: ①If there is coke or ablation between the valve and the valve seat, the lighter can be grinded, the heavier should be the first