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故障现象:漏气不严重者发动机起动后转速快,爆燃声连续而密,锯链在小油门情况下也运转较快,而且调节化油器供油量也无效,当锯切木材时,加大油门发动机也因无力而停动。漏气严重时,发动机不能起动,或起动后高速转一会发动机便马上熄火故障原因:若曲轴箱漏气不严重,在活塞往上运动时,曲轴箱内压力差减小,进入曲轴箱及气缸内的混合气很稀,缸内富氧,点火后嫩烧快,但爆燃后气体对活塞顶部压力小,故一加负载(锯木),发动机因功率不足熄火。若曲轴箱漏气严重,则箱内压力与大气压相等,则油锯不能起动。快速判断曲轴箱漏气部位与排除:曲轴箱产生漏气部位较多,一般用肉眼是看不见的。实践中,我们用吹烟法检查曲轴箱漏气部位,
Symptoms: leakage is not serious, the engine speed after starting fast, deflagration sound continuous and dense, saw chain in the small throttle also works faster, but also to adjust the carburetor fuel supply is invalid, when sawing wood, plus Big throttle engine also stopped due to weakness. Serious leaks, the engine can not start, or start a high-speed engine turn off immediately after the failure Reason: If the crankcase leak is not serious, the piston upward movement, the crankcase pressure differential decreases into the crankcase and Mixture of gas in the cylinder is very thin, oxygen-rich cylinder, quick burning after ignition, but the deflagration gas pressure on the top of the piston is small, so a plus load (sawnwood), the engine flameout due to lack of power. If the crankcase gas leak serious, the pressure inside the box is equal to the atmospheric pressure, then the chain saw can not start. Quickly determine the crankcase leakage and exclusion: Crankcase leaks more, generally with the naked eye is invisible. In practice, we use the smoke method to check the crankcase leakage site,