半精加工的主轴承安装后需要修整和调配，这样曲轴就必须拆下。
Semifinished main bearings require finishing and fitting after installation, so that the crankshaft must be taken out.
半精加工的活塞是加大尺寸的，必须进行修整以便与气缸相配合。
Semifinished pistons are oversize and must be finished down to size to fit the cylinders.
半精加工的主轴承安装后需要修整和调配，这样曲轴就必须拆下。
Sparated Bearing block for main transmission shaft Easy for maintenance and fix.
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