TM    5-2815-241-34&P CYLINDER  BLOCK  -  CONTINUED ACTION LOCATION ITEM REMARKS CLEANING/INSPECTION   -   CONTINUED 18.  Cylinder block (1) Counterbore   (2) 19. a. Using 6-inch to 7-inch micrometer, measure  counterbore  diameter,  A. If  diameter  is  greater  than  6.5635 inches  (188.713  mm),  tag  counter- bore  for  salvage  sleeve,  steps  57 thru   63. b. Using dial indicator depth gage, meas- ure  counterbore  depth,  B. If  depth  is  greater  than  0.412  inch (10.486  mm),  tag  counterbore  for salvage  sleeve,  steps  57  thru  63. c. Using dial indicator depth gage, meas- ure counterbore depth at four equally spaced  points  at  the  edge  of  the  bore. If  there  is  a  total  of  0.001  inch  (0.03 mm)  difference  in  these  measure- ments,  tag  counterbore  for  cutting, steps  53  thru  56. If  counterbore  ledge  (3)  is  not  flat  with the  top  of  the  cylinder  block  within 0.0014  inch  (0.038  mm)  overall,  tag counterbore  for  cutting,  steps  53 thru  56. d. Check  that  counterbore  ledge  (3)  is  at  a 90-degree  angle  to  cylinder  sleeve bore. If  counterbore  ledge  is  not  at  a go-degree  angle  to  cylinder  sleeve bore,  to  within  0.005  inch  (0.13 mm),  tag  counterbore  for  cutting, steps  53  thru  56. Cylinder   sleeve   (4) a. Using leak-detection dye, inspect for cracks  just  under  top  flange  (5)  at bottom  of  sleeve  (6)  or  above  gasket groove  (7). If  cracks  exist,  discard  cylinder sleeve. b. Inspect for corrosion, pits, or erosion. If  corrosion,  pits,  or  erosion  exists 1/16 inch (1.59 mm) deep or more, discard  cylinder  sleeve. c. Inspect  underside  of  cylinder  sleeve  top flange  (5)  for  dents,  or  pitting. If  dents  or  pitting  cannot  be  removed by  lapping,  discard  cylinder  sleeve. 2-148