In the lathe, the shoulder on both sides of the car spin steam seal block, cars spin amount equal to the amount of gap needed refine, but the thickness of the shoulder not less than 1.5mm, or should be replaced. When steam Seal radiation gap is to small, you can use flat shovel, twisting and beating both the shoulder side of steam seal block, twist two dozen steam seal block backwards to make concessions. But be aware that the last remaining steam seal block yield gap not less than 2.5mm.