TM   5-2815-241-34&P CYLINDER  BLOCK  -  CONTINUED I ACTION LOCATION ITEM REMARKS REPAIR  -  CONTINUED WARNING Safety goggles must be worn to prevent eye injury caused by flying steel chips. NOTE Step 28 is for main bearing capscrew threads tagged for repairs and steps 29 thru 35 are for cylinder block tagged for sleeve lower bore repairs. 28. Cylinder block (1) Main  bearing capscrew  hole  (2) a. Using  1/2-inch  portable  electric  drill and  1  1/32-inch  bit,  drill  hole  2.675  to 2.705 inches (68.16 to 68.74 mm) deep  from  main  bearing  cap  pad  (3). b. Using  ST-1230  screw  thread  insert  kit, tap  hole  of  2.425  to  2.455  inches  (61.60 to 62.36 mm) deep. c. Using  inserting  tool  from  kit,  install screw  thread  insert  0.860  to  0.890  inch (21.84  to  22.61  mm)  deep  below  main bearing  cap  pad  (3). 29. Cylinder block (1) ST-1081   boring tool  (4) Install assembled ST-1081 boring tool, allowing bore adapter (5) to engage count- erbore,  and  holes  in  adapter  plate  (6)  to match  holes  in  cylinder  block. 30. Adapter  plate  (6) a. Fasten in place with capscrews (7). b. Using  1/2-inch  drive,  1  1/16-inch  socket, and 0 to 150 ft lb (0 to 210 N•m) torque  wrench,  screw  in  and  torque  cap- screw 50 to 75 ft lb (6.9 to 10.4 kgm). TA  242436 2-156 Change  1