ARMY TM 9-6115-464-34
AIR FORCE 35C2-3-445-2
NAVY NAVFAC P-8-624-34
c. 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 obsever this warning could cause servere 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 obsever this warning could cause
servere personal injury or death.
Clean all parts in dry cleaning solvent (Federal Specification P-D-680) and dry thoroughly with
filtered compressed air.
Scrape carbon deposits from valves and cylinder head.
Visually inspect rocker arms for cracks, corrosion, and excessive wear. Check that oil holes are
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
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 O. 3780 inch.
Replace worn valve guides as follows:
(a) Use a 5/8 inch drift with a 3/8 inch pilot and drive out valve guides.
(b) Drive replacement valve guides to a depth of 1.3700 to 1.3800 inches blow cylinder head deck.
(c) Ream bore diameter of intake valve guides to 0.3740 to 0.3750 inch.
(d) 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 valve spring
to a length of 1.4920 inches. Test load shall be 72 to 82 pounds. Compress spring to a length of
1.0820 inches. Test load shall be 80 to 86 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 straightedge 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.