ARMY TM 9-6115 464 34
AIR FORCE TO 35C2-3-445-2
NAVY NAVFAC P-8-624-34
Cleaning. Inspection. and Repair
Solvent, Dry Cleaning P-D-680, Type II is flammable and moderately toxic to skin, eyes and respiratory
tract. Eye and skin protection required. Good general ventilation is normally adequate. Failure to
observer this warning could cause severe personal injury or death.
Compressed air used for cleaning and drying purposes can create airborne particles that may enter the
eyes. Pressure shall not exceed 30 psig and use only with adequate chip guards and chipping goggles.
Failure to observer this warning could cause severe personal injury or death.
Clean all parts in dry cleaning solvent (Federal Specification P-D-680) and dry thoroughly with filtered compressed
Scrape carbon deposits from valves and Cylinder head.
Visually inspect rocker arms for cracks, corrosion, and excessive wear. Check that oil holes are open.
Inspect rocker arm shafts for cracks, deep wear patterns, nicks, and burrs. Remove minor nicks and burrs with oil
soaked crocus cloth. Clean polished shaft in dry cleaning solvent to remove abrasive particles.
Inspect blocks for cracks, nicks, burrs, and excessive wear. Remove nicks and burrs from outer surfaces with fine
abrasive paper or stone.
Inspect springs for cracks, breaks, chaffing and distortion.
Inspect push rods for cracks, bends, excessive wear, nicks and scratches. Polish push rods with crocus cloth to
remove minor defects.
Inspect valve guides for excessive wear. Bore diameter of exhaust valve guide shall be 0.3750 to 0.3790 inch.
Bore diameter of intake valve guide shall be 0.3740 to 0. 3780 inch.
Replace worn valve guides as follows:
Use a 5/8 inch drift with a 3/8 inch pilot and drive out valve guides.
Drive replacement valve guides to a depth of 1.3700 to 1.3800 inches blow Cylinder head deck
Ream bore diameter of intake valve guides to 0.3740 to 0.3750 inch.
Ream bore diameter of exhaust valve guides to 0.3750 to 0.3760 inch.
Inspect valve springs for cracks, breaks, and distortion. Using a spring tester, compress spring to a length of
1.0820 inches. Test load shall be 163 to 180 pounds.
Inspect Cylinder head for cracks, breaks, and broken studs. Remove broken studs by center punching, drilling,
and using an easy out.
Check Cylinder head for warping using a straight edge and feeler gauge. Check lengthwise and between each
Cylinder crosswise. Warpage shall not exceed 0.003 inch laterally and 0.005 inch longitudinally. Cylinder head
may be milled to remove minor warpage.
3-112 Change 1