TM 5-4320-300-14
6-9. VALVES, CAMSHAFT, AND TIMING GEARS (CONT)
Location/Item
Action
Remarks
WARNING
Dry cleaning solvent is flammable and potentially dangerous to people and property. Do not use
near open flame, sparks, excessive heat, or on hot sur- faces. Flash point of P-D-680 solvent is
100° to 138° F (38° to 59°C). Use solvent in a well-ventilated area, and avoid inhaling fumes. If
repeatedly ex- posed to fumes, seek fresh air and immediate medical help. Avoid prolonged
exposure of skin to solvent. Wash exposed skin immediately and thoroughly.
Compressed air used for cleaning shall not exceed 100 psi (690 kPa). Use goggles or face shield for eye protection. Do
not direct airstream against skin.
35. Valve seat
Clean seat inserts with P-D-680 dry
insert and
cleaning solvent and dry with com-
counterbore
pressed air. Inspect counterbores for
cleaning and
cleanliness, roundness, and flatness;
inspection
inspect for cracks and other damage.
36. Valve seat
If counterbores are clean, round, flat and un-
insert in-
damaged, immerse the cylinder head for 30
stallation
minutes in water heated to 180° to 200°F
(82° to 93°C).
CAUTION
Damage to valve insert may result if insert is installed after the cylinder head has cooled. Install
valve seat inserts immediately after removing head from water bath.
Remove cylinder head from water bath and rest it bottom side up on a bench. Place an insert in the counterbore valve
seat side up. This must be done quickly while cylinder head is still hot and insert is cold (room temperature). Drive insert
in place until it seats solidly in the cylinder head.
6-68
