The oil pan is usually formed of pressed steel.

油盘通常用的薄钢板冲压制成。

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。

The bottom of the block is covered with an oil pan or oil sump.

缸体的顶部是气缸盖，它组成了燃烧室，缸体底部是油底壳。

It also discusses some control methods for reducing the radiated noise from oil pan.

文中还论述了降低油底壳辐射噪声的控制方法。

This paper described two methods on how to predict the radiated noise of engine oil pan.

介绍了对发动机油底壳进行噪声预测的两种方法。