该升+升曲轴箱是为积分气瓶，所以我们需要的东西的，以螺杆圆柱上曲轴箱。
The L+L crankcase is made for integral cylinders so we need something's to screw the cylinder onto the crankcase.
窜气，基本上是被压缩的空燃混合气和燃烧后的气体的泄漏，它通过活塞环进入曲轴箱。
Blowby is basically the leakage of compressed air-fuel mixture and burned gases past the piston rings into the crankase.
检查确定引擎安装在平实被板上以便曲轴箱免于应力。
Check to make sure the engine is mounted on a level surface so that the crankcase is free of tension.
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