A piston pin fits into a round hole in the piston. 活塞销装在活塞的环形的孔里。
A piston pin fits into a round hole in the piston. 活塞销装在活塞的环形的孔里。
If only one pin is loose, the knocking will become more distinct when the spark plug in the affected cylinder is shorted. 如果只有一个活塞销松动,当受到影响的气缸的火花塞被短路时,敲击声会变得更加明显。