TM9-2815-226-34-1 - JATONKAM35s HOME ON THE WEB

TM 9-2815-226-34-1(5) Make light cuts of 0.001 to 0.003 in. (0.025 to 0.076 mm) deep, removing only enough material to makehead serviceable.(6) Finish surface to 125 R.M.S. finish.(7) Remeasure head height to ensure it is not less than 4.340 in. (110.236 mm).(8) Rework valve seat insert counterbore by removing amount of stock equal to that removed during headresurfacing.n. Valve seat insert counterboring.NOTETwo conditions will determine which size valve seat insert cutter (ST-662) will beused for counterboring. If head was refinished and same inserts are to bereinstalled, no oversize counterboring will be required. Since head material wasremoved, insert counterbores will only have to be deepened to amount equal tomaterial removed. The second condition involves replacement of inserts which arefound loose or their seating areas cannot be restored through regrinding. Thoseinsert counterbores must be enlarged to accept oversize inserts. Inserts areavailable in 0.005, 0.010, 0.020, 0.030, and 0.040 in. (0.127, 0.254, 0.508, 0.762, and1.016 mm) oversizes. The 0.020, 0.030 and 0.040 in. oversize inserts are 0.005,0.010, and 0.015 in. (0.127, 0.254, and 0.381 mm) thicker respectively; therefore,their counterbores will also have to be deepened.(1) Select proper size ST-663 tapered arbor to fit valve guide.(2) Insert arbor into valve guide.3-176