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TM 5-4320-304-14
TM 08922A-14/1
REPAIR:
6-2. REPAIR CYLINDER HEAD AND VALVE ASSEMBLY (Continued)
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Replace cylinder head if any of the
following conditions exist: if the cyl-
inder contact surface is roughened, not
level, and cannot be repaired; if the
valve seats are so worn that recutting
is no longer possible; if contact surface
for cylinder head cover is rough or
damaged; or if there are cracks between
the valve seats.
Check that the inside diameter of each
valve guide does not exceed 0.2780 inch
(7.059 mm).
Check that valve seat angle does not exceed 45 degrees.
Clean valves with diesel fuel oil and dry with com-
pressed air.
Inspect valves for warpage, burning, or other
damage.
Inspect valve stems for scratches, scuff marks, or
other damage.
Inspect valve tulips, faces, and heads for pitting,
ridges, or cracks.
Check that each valve stem diameter is not less
than 0.2716 inch (6.95 mm).
Check that each valve head diameter is not less than 1.200 inches (30.5 mm).
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If the inside diameter of a cylinder head valve guide (1)
exceeds 0.2780 inch (7.059 mm), replace valve guide.
Press out valve guide using mandrel 669 347 00.
From cylinder head bottom, push valve guide (1) out
of cylinder head (2). Insert new valve guide (1) into
cylinder head (2). install new valve guide by pressing
in with mandrel 669 347 00. Minimum inserting
pressure is 220 inch-pounds (245 cm·kg).
Ream the inside diameter of the valve guide to
0.2756/0.2759 inch (7.000/7.009 mm) using hand
reamer 612 107 00.
Repair defective cylinder head valve seats by re-
cutting with a 45 degree valve seat cutter. Recut valve
seats with valve reseating tool 612 103 00, guiding pin 612 104 00, and handle for valve reseating
tool 670 323 00. Cut until valve seat is absolutely clean.
6-3
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