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通常气门质量不合格或发生某些故障,都可能引起气门杆的折断。然而摇臂及摇臂衬套的磨损、气门锁夹的配对不当,却是易被人们忽视的原因。
Usually valve quality failed or some failure occurred, may cause the valve stem break. However, the wear of the rocker and rocker arm bushings and the improper pairing of the valve lock clamps are easily overlooked by people.