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TM 5-2420-222-34
3-12.
VALVE MAINTENANCE (Con’t).
CAUTION
Do not nick or scratch surface between valve
face and stem. A small nick can cause valve
head to break off during operation.
5.
Slide valve (6) out of cylinder head (1).
b.
CLEANING AND INSPECTION
WARNING
Carbon removing compound is a corrosive liquid. If splashed In eyes, it can
cause blindness. If splashed on skin, it can cause serious burns. Be sure to
wear safety goggles or lenses, rubber apron, and rubber gloves. If accidentally
splashed In eyes or on skin, flush with clean, cool water, refer to FM 21-11 for
first aid Information, and get medical attention Immediately.
1.
Soak valve overnight in carbon removing compound.
WARNING
Compressed air used for cleaning or drying purposes, or for clearing restrictions,
should never exceed 30 psi (207 kPa). Wear protective clothing (goggles/shield,
gloves, etc.) and use caution to avoid Injury to personnel.
2.
Using paint brush and hot water, clean carbon deposits off valve, then dry with compressed air.
WARNING
Dry cleaning solvent, P-D-680, is toxic and flammable. Always wear protective
goggles and gloves, and use only In a well-ventilated area. Avoid contact with
skin, eyes, and clothes, and DO NOT breathe vapors. DO NOT use near open
flame or excessive heat. 270 The solvent's flash point is 100°F-138°F (38°C-59°C).
If you become dizzy while using cleaning solvent, immediately get fresh air and
medical help. If solvent contacts eyes, Immediately wash your eyes and get
medical aid.
3.
Clean valve spring, valve lock, exhaust valve cap, and valve seat with dry cleaning solvent. Dry thoroughly with clean
rags.
TA701270
3-78
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