ARMY   TM9-2805-262-14 AIR  FORCE  TO  38G2-90-1 NAVY   NAVFAC   P-8-613-14E Table 5-2. Engine Repair and Replacements Limits (cont). Item VALVES Exhaust: Length  to  gage  point Stem diameter Head diameter Seat  angle Stem  guide  clearance Intake: Length  to  gage  point Stem diameter Head diameter Seat  angle Stem  to  guide  clearance Springs: Pounds  load  (valve  open) Length  (valve  closed) Pounds load (valve closed) VALVE GUIDE Exhaust  and  intake: Stem  clearance Inside  diameter VALE SEAT INSERTS Exhaust: Inside  diameter Seat  angle Measurements Maximum* 2.7885 (7.0828) 0.3100 (0.7874) 0.8390 (2.1311) 45°5' 0.0020 (0.0051) 2.7885 (7.0828) 0.3100 (0.7874) 0.9010 (2.2885) 45°45’ 0.0045 (2.2352) 42 (18.9kg) 1.095 (2.7813) 19 (8.55kg) 0.0045 (0.0114) 0.3145 (0.7983) 0.7480 (1.8999) 45°0’ Minimum* 2.7850 (7.0739) 0.3095 (0.7861) 0.8490 (2.1565) 46°0’ 0.0045 (0.0114) 2.7850 (7.0739) 0.3105 (0.7887) 0.9110 (2.3139) 45°0’ 0.0020 (0.0051) 41 (18kg) 1.095 (2.7813) (8.10kg) 0.0020 (0.0051) 0.3125 (0.7937) 0.7460 (1.8948) 44°45’ 5-57