Install stationary seat (3B) into bore in inboard cover (4) with fingers (do not touch seal face with any tools) so slot in face of seal is facing into inboard cover (4).

• 用手（禁止使用任何工具接触密封面）将静止座（3B）安装于内侧盖（4）孔腔内，以便密封面槽对准内侧盖（4）。