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。

youdao

Loosen oil pan bolts and remove the front bolt at each side.

松动油底壳螺栓，拆下每一面的前螺栓。

youdao

According to actual case of thermal recovery in oil field, strengths were checked on pretighten force and working state, and the rigidity was test for failure bolt.

根据油田热采现场的实际应用情况，对失效螺栓进行了预紧状态以及操作状态的强度校核，并进行了硬度测试。

youdao

The bolt comes out and there was no way to hold the oil in the pan.

VOA: standard.2010.08.01

"There's a nut on the inside of the oil pan. The bolt came out. But the nut was not welded corectly to the oil pan,so the nut fell off.

VOA: standard.2010.08.01