ARMY TM 9-2815-259-24 AIR FORCE TO 38G1-125-2 MARINE CORPS 09249A/09246A-245-115 3 Position chisel with special ground end (Figure 5-92) in burr on valve seat insert. Tap handle of chisel with hammer until valve seat insert comes loose. Remove and discard valve seat insert. Refer to Figure 5-93 for detailed view. FIGURE 5-92. VALVE SEAT REMOVAL CHISEL FIGURE 5-93. REMOVAL OF VALVE SEAT INSERT 4 Thoroughly clean area around valve seat bore and inspect for damage or cracks. Replace cylinder head as necessary.