Such as whether the bolt is tightened, the piston ring is installed correctly, damaged oil seal is replaced, etc.

譬如螺栓是否拧紧，活塞环安装是否正确，损坏油封是否更换等。

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This paper introduced a four-body contact model of steel crown-the nodular cast-iron skirt-piston pin-connecting bolt for the steel-crown aluminum-skirt composite piston of locomotive diesel engines.

本文以机车柴油机钢顶铝裙组合活塞为对象，建立组合活塞钢顶铝裙连接螺栓-活塞销的四体接触计算模型。

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