对GA123A泵的高温波纹管式机械密封的失效原因进行了分析，证实热油泵的密封故障是由于波纹管内侧水垢和积碳引起。
Failure cause of mechanical sealing of high temperature screwed pipe for GA123A pump is analyzed. It is showed that the causes of the sealing failure are scale deposit and carbon laydown in pipe.
喷油泵上的冒烟限制器失效，在发动机急剧加速时也会冒黑烟；
The restrictions on fuel injection pump smoke the failure in the engine, accelerated sharply when also can smoke;
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