COMPRESSION Valve Seat Inserts To Remove Valve Seat Insert Use valve seat puller 19138 as shown in Fig.  15, and select the proper puller nut.  See Table 3.  Be sure the puller body does not rest on the valve seat insert.  Fig. 16.  Turn the 5/16" bolt with a wrench until insert is pulled out of the cylinder.  Fig.  16. Fig.  15 - Removing Valve Seat Fig.  16 - Inserting Valve Seat Puller NOTE: On aluminum alloy cylinder models, it may be necessary to grind the puller nut until the edge is 1/32" (0.8 mm) thick in order to get the puller nut under the valve insert.  Fig.  16. TABLE NO.  4 VALVE SEAT INSERT AND COUNTERBORE TOOLS COUNTERBORE CUTTER & INSERT BASIC MODEL SERIES CUTTER SHANK DRIVER PILOT DRIVER ALUMINUM CYLINDER 6B, 8B 19126 19136 60000, 80000 19126 19136 82000, 92000, 94000 19126 19136 100000, 130000 19126 19136 140000, 170000, 190000 19127 19136 CAST IRON CYLINDER 5, 6, N 19133 19129 19126 19136 8 19132 19129 19126 19136 9 19132 19129 19127 19136 14, 19, 190000 19131 19129 19127 19136 200000, 23 19131 19129 19127 19136 230000, 240000 19131 19129 19127 19136 300000, 320000 19127 19136 7