01.8 Refacing valve seats with valve seat cutter 352/352 A 9 Turning hand crank. move steady bar to correct position. Floating guide is to be locked horizontally in roughly the center of the guide with the aid of steady clamp. Cutter must turn just as smoothly as before. 10 Turning the quick-action adjuster sets cutting tool to inner seat edge. Tighten coupling nut now, but do not start chip feed yet. 11 Turn crank while holding feed screw. Cutting is normally irregular at this position.
After turning once release coupling nut of quick-action adjuster and move tool back to inner setting, 12 Release locking screw (1) and turn knurled collar (2) anti-clockwise by about 1/2 to 2 divisions (1 division = 0.1 mm). Retighten locking screw (1) and coupling nut, then beginning to turn again. 13 Hold feed screw and turn crank until cutting tip has reached outer position. 14 Chip feed is to be continued until seat is fully refaced (do not go below machining limit). Then turn once again without chip feed. Newly fitted valve seat rings must show values given in table. See 1.2/4 for repair sizes. 15 Re·assemble cylinder head, referring to 5.1/1. 6.2/2