ARMY TM 9-2815-259-24 AIR FORCE TO 38G1-125-2 MARINE CORPS 09249A/09246A-24 5-110 2 Exhaust valve outer diameter should be 0.3090 - 0.3100 in. (7.848 - 7.874 mm). (e) Use valve inspection center (D-05058ST) to determine if valves are out of round, bent or warped.  Maximum valve face runout is 0.0015 in. (0.038 mm).  Replace valves not within specifications. CAUTION Do not nick valve head-to-stem radius while grinding valves.  A nick could cause valve to break.  Break all sharp edges after grinding valve.  Failure to comply could result in damage to engine. (f) Reface valve to 29.25° ± 0.25° using valve refacing station, refer to Figure 5-90. (4) Clean, inspect, and measure cylinder head as follows: (a) Inspect combustion face for evidence of physical damage, oil or coolant leakage, or gasket failure.  Repair or replace cylinder head if there is evidence of physical damage; such as cracking, abrasion, distortion, or valve seat “torching”.  Inspect all cylinder head passages for restrictions. FIGURE 5-90.  VALVE FACE ANGLE (b) Remove all plugs from cylinder head. (c) Scrape gasket material, oil, carbon, and rust from cylinder head.  Use a powered wire brush to clean sealing surfaces.