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TM 5-2420-222-34
3-6.
CYLINDER HEAD MAINTENANCE (Con’t).
c.
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.
•
Avoid contact with live steam. Live steam can burn skin, cause blindness, and
cause other serious Injury. Be sure to wear protective apron, gloves, and
safety goggles when using live steam.
•
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.
1.
Soak cylinder head overnight in carbon removing compound. Using wire brush and hot water, clean off carbon
deposits. Using y in. tube brush and hot water, clean valve guides. Dry thoroughly 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. The solvent's flash point is 100°F-138°F (38°C-590C). 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.
2.
Clean all other metal parts with dry cleaning solvent and wipe dry with a clean, dry rag.
3.
Check cylinder head for cracks, breaks, warping, damaged threads, and abnormal wear.
4.
Using square edge and thickness gage, check flatness of bottom mounting surface of cylinder head.
5.
Remove and inspect valves (see paragraph 3-12).
6.
Install valves (see paragraph 3-12).
d.
REPAIR
1.
Restore damaged threads using screw threading set.
2.
If bottom mounting surface of cylinder head (3) was not flat, use grinding equipment to flatten cylinder head.
e.
ASSEMBLY
If removed, position two expansion plugs (4) in place in cylinder head (3). Using ball-peen hammer, tap expansion
plugs into position.
f.
INSTALLATION
1.
With the aid of an assistant, position new gasket (5) and cylinder head (3) in place on engine block (6).
3-38
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