1·The engine had a broken crankshaft.
发动机的曲轴断了。
—— 《柯林斯英汉双解大词典》
2·The crankshaft, regarded as the "backbone" of the engine, serves to change the reciprocating motion of the piston into rotary motion and handles the entire power output.
曲轴，也叫做发动机的“脊柱”，其作用是将活塞的上下往复运动转换成为旋转运动，并且控制着整个的功率输出。
3·Fit chain drive sprocket on the crankshaft.
将链条驱动链轮安装到曲轴上。
4·Camshaft from the crankshaft through the timing belt or gear or chain drive.
凸轮轴由曲轴通过齿形带或齿轮或链条驱动。
5·The flywheel marks and indentation are used for setting the valve and the ignition systems relative to prescribed position of the crankshaft.
飞轮标记与凹口可以用来确定阀门与点火装置系统的位置，其要根据曲轴的规定位置来确定。