TM 5-4320-300-14
6-9. VALVES, CAMSHAFT, AND TIMING GEARS (CONT)
Location/Item
Action
Remarks
REPLACEMENT OF
VALVE PARTS
27. Valves
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 faces. Remove
slight scratches or scuff marks with P-C-458
crocus cloth.
28. Valve guide
Replace any valve guides that are fractured,
chipped, scored, or show excessive wear. Re-
place any guide with a guide-to-stem clearance
greater than 0.005 inch (0.1827 mm).
29. Valve springs,
Replace any valve springs that are pitted,
locks, caps,
fractured, excessively worn, or damaged. Re-
and seats
place locks, caps, and seats that are fractured,
excessively worn, or damaged. Replace any
spring that can be compressed to 1.93 inches
(49.02 mm) with a load less than 25 pounds
(11.34 kg). Replace both valve springs if the
difference between any pair of valve springs
exceeds 6 pounds (2.7 kg).
30. Valve guide
Oil seals were removed and discarded during
oil seals
disassembly. Replace with new oil seals prior
to reassembly.
31. Valve seat
Replace any valve seat inserts that show ex-
inserts
cessive wear, cracks, pitting, or improper valve
seat angle (greater or less than 31 degrees).
6-66
