本厂是汽车发动机液压挺杆和活塞销的专业化生产企业。

The factory is Tappet car engine and hydraulic piston pin the specialized production enterprises.

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整修气缸需要12～20小时（时间长短取决于发动机的类型），这包括调配和安装新活塞、活塞环、活塞销和连杆。

Refinishing cylinders requires 12 to 20 hours (according to the type of engine). This includes fitting and installing new pistons, rings, piston pins, and connection rods.

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结果表明，导致活塞销失效的主要原因是活塞销内表面在发动机装配使用前存在折叠裂纹。

The results indicate that the main reason causing the failure of the piston pin is fold cracks in inner-surface of the piston pins existing before that the engine is assembled and tested.

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