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TM 5-4320-305-24
4-7. REPLACE/REPAIR VALVES, VALVE GUIDES, AND VALVE SEATS (Continued)
e. Inspect valve guides (1) and ream with valve guide reamer, 8 mm, No. 123510 (2).
WARNING
Death or serious injury could occur if diesel fuel oil
is not handled carefully. Use in a well-ventilated area
away from open flame, arcing equipment, ignition
sources, heaters, or excessive heat. Always store
fuel in proper, marked containers. DO NOT SMOKE.
Death or serious injury could occur if compressed air
is directed against the skin. Do not use compressed
air for cleaning or drying unless the pressure is/has
been reduced to 30 psi (2.11 kgcm2) or less. When
working with compressed air always use chip
guards, eye protection, and other personal protective
equipment.
f. Clean valve guides with brush and diesel fuel oil. Dry with low pressure compressed air.
3 Replace any valves that show head warping, burning, or other damage. Replace valves that have seriously
scratched or scuffed stems; or pitted, ridged, or cracked tulips, faces, or heads. Replace valves that have a valve
joint face thickness less than 0.0197 inch (0.5 mm) for inlet or exhaust valve. Remove slight scratches or scuff
marks with crocus cloth.
4-56
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