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TM 9-2330-398-24
4-1.
ENGINE ASSEMBLY REPAIR (continued).
WARNING
Drycleaning solvent P-D680 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 flames
or excessive heat.
9.
Thoroughly clean all components of the cylinder head assembly using drycleaning solvent and a stiff brush.
10.
Inspect oil inlet port using cleaning wire, and flush clean with drycleaning solvent.
WARNING
Particles blown by compressed air can be dangerous. Be certain to direct air
stream away from user and other personnel In the area.
11.
Dry all tapped holes and oil ports using compressed air.
12.
Inspect cylinder head casting using Magnaflux or dye-penetrating technique to detect cracks.
14.
Inspect all finished surfaces for nicks, scratches, pitting, or excessive wear.
15.
Inspect all tapped holes for worn or damaged threads.
16.
Repair minor damage to the cylinder head castings using crocus cloth dipped in drycleaning solvent. Repair minor
damage to threads using a proper size tap. Do not enlarge threaded hole. If minor damage cannot be repaired,
replace cylinder head casting and valve seats. Salvage all other usable components.
17.
Inspect studs for stripped or worn threads or bent or loose connections. Replace studs if damaged.
18.
Check for valve-stem-to-valve-guide allowable clearance by measuring inside diameter of valve guide (133 and
134) and outside diameter of valve stem. Refer to Table 4-1 for correct dimensions.
NOTE
If valve stem is worm below minimum tolerances, replace valve. If new valve fails to
correct stem-to-valve clearance, replace valve guide.
19.
Remove valve guide and install new valve guide through top of cylinder head using valve guide driver/installer tool
set. Allow valve guide to remain at 0.3437 inch (0.8730 cm) from top of cylinder head. Ream the replacement
valve guide, if necessary, to obtain proper valve-stem-to-valve-guide clearance.
20.
Inspect valves for warped stems, pitting, evidence of burning, and excessive wear. Replace valves if badly
damaged or if valve stem is worn beyond tolerances shown in Table 4-1.
CAUTION
If grinding on valve face produces valve with thin edge, replace valve.
4-14
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