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TM 5-4320-305-24
4-7. REPLACE/REPAIR VALVES, VALVE GUIDES, AND VALVE SEATS (Continued)
g. Inspect installed valve
seat insert rings (1) for
nicks, burrs, or other
minor damage to valve
mating surfaces. Very
carefully smooth out
any nicks, burrs, or
other minor damage
with valve guide man-
drel No. 122305, valve
seat ring cutter No.
122302 (2), mandrel
handle 122306 (3), and
holder No. 122304 (4).
h. Check valve head/cylinder head seat clearance with NEW valve in accordance with procedure in
CLEANING/INSPECTION step 10.
Maximum clearance is 0.2520 inch (6.4 mm).
Minimum clearance is 0.2283 inch (5.8 mm).
i. If maximum clearance is exceeded, replace valve seat insert rings again. Follow procedure described
in step d. If clearance is below minimum, remachine valve seat insert rings with valve seat ring cutter
No. 122302 and holder No. 122304. Reconfirm that clearance falls within limits after remachining.
NOTE
If remachining will cause either limit to be exceeded,
replace valve seat insert rings or valves, respectively.
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.
j. Clean valve seat insert rings with diesel fuel oil and dry with low pressure compressed air.
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