TM  10-3930-643-34 BRAKE  TROUBLESHOOTING  AND  MAINTENANCE. 8-14. Air Compressor. (Sheet 8 of 13) CLEANING/INSPECTION NOTE If necessary, grind bearing  journals  to undersize  dimension connecting  rod next  lower and replace bearings with appropriate undersize  bearings. 37. Inspect  threads  and  keyway  of crankshaft  (38). Replace if keyway is chipped or misshaped or threads are stripped. 38. Using  a  micrometer,  measure  cylinder diameter of cylinder block (15). Cylinder diameter should be 1.995 to 2.000 inches. 39. Inspect  cylinder block  (15)  for cracks,  scoring,  pitting  or damage. If severe scoring or pitting of cylinder  walls  is  evident,  cylinders may be bored to 2.015 to 2.020 inches and pistons (27) replaced with oversize  pistons. 40. Inspect  piston  (27)  for  cracks. Light scoring or abrasion marks can be removed with a stone. 41. Install ring sets (22 and 23). 42. Using  a  feeler  gage,  measure clearance  of rings in grooves. Clearance should be 0.005 to 0.0025 inches. Go to sheet 9 8-69

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