口述13-3

Please say something about the moving parts of main engine and their maintenance work.请说一下关于主机的运动部件及其维护工作。
The moving parts of the main engine include the piston, the connecting rod, and the crankshaft. The maintenance work of the moving parts of the main engine is as follows: (1) clean and measure piston ring grooves; (2) open up cooling spaces and clean them; (3) check tightness after reassembly; (4) measure crank deflections and so on. 主机的运动部件包括活塞，连杆和曲轴。主机运动部件的维护工作如下：1、清理并测量活塞环槽；2、打开冷却区域并清理它们；3、重新组装后检查是否上紧；4、测量臂距差等等。