ARMY TM 9-2815-259-24
AIR FORCE TO 38G1-125-2
MARINE CORPS 09249A/09246A-24
Exhaust valve outer diameter should be 0.3090 - 0.3100 in. (7.848 - 7.874 mm).
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
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.
Reface valve to 29.25° ± 0.25° using valve refacing station, refer to Figure 5-90.
Clean, inspect, and measure cylinder head as follows:
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
Remove all plugs from cylinder head.
Scrape gasket material, oil, carbon, and rust from cylinder head. Use a powered wire
brush to clean sealing surfaces.