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TM 5-4210-220-12
4-28.3 Air Compressor - Continued
k. Inspection
WARNING
Dry cleaning solvent P-D-680 (safety or Stoddard's solvent) is potentially dangerous. Avoid
repeated and prolonged breathing of vapors and skin contact with the liquid. Do not use near
open flame, arcing equipment or other ignition sources. Always wear eye protection and
protective clothing. The flash point of P-D-680 is 100 to 138 deg. F (30 to 59 deg. C).
(1) Wash all compressor components using dry cleaning solvent (item 10, Appendix E).
WARNING
Death or serious injury could occur if compressed air is directed against the skin. Do not use
compressed air for cleaning or drying unless the pressure is/has been reduced to 30 psi (2.11
kg/cm2) or less. When working with compressed air always use chip guards, eye protection and
other personal protective equipment.
(2) Dry all components using compressed air.
(3) Using extreme care not to scratch machined surfaces, remove carbon deposits form the cylinder head
interior surface. Clean all interior air and water passages.
(4) Using extreme care not to scratch machined surfaces, remove carbon from piston crown and ring
grooves.
(5) Using compressed air, blow out all drilled passages to ensure they are clear.
(6) Using extreme care not to scratch machined surfaces, remove all gasket material from gasketed
surfaces.
(7) Inspect all cylinder head components as detailed below.
(a) Examine cylinder head for cracks and damaged threads. The head gasket surface must be free of
nicks and gouges. Replace the head if damaged.
(b) Inspect the inlet and exhaust valve discs for wear. Replace the valves if cracked, pitted or
grooved on either side.
(c) Check the inlet and exhaust valve springs for loads at specified heights.
Inlet Valve Spring
Load at 0.287 Inch ..........................................................0.62/0.36 lb (0.28/0.16 kg)
Exhaust Valve Spring
Load at 0.73 inch ............................................................3.70/3.30 lb (1.68/1.50 kg)
4-542
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