TM 5-4310-451-14
5-24. EXHAUST VALVES MAINTENANCE (Con’t).
b. CLEANING AND INSPECTION
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 1000F-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.
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.
Clean all metal parts with dry cleaning solvent and dry with compressed air.
2.
Inspect spring for pitting and damage.
3.
Check spring tension. Replace spring when a load of less than 25 lb (11.35 kg) will compress spring to 1.8 in. (4.6
cm).
4.
Inspect exhaust valve stem and face for cracks, pitting, and warping.
5.
Inspect outer diameter of exhaust valve face for damage. Grind or replace as required.
c. REPAIR
NOTE
Exhaust valve seat must be ground before Installation.
1.
Grind exhaust valve (8) using 30° grinding stone.
2. Edge of exhaust valve (8) must be at least 0.031
in. (0.787 mm) thick after grinding.
5-44
