TM-9-2330-356-14
SEMITRAILER, TANK: 5000 GALLON, BULK HAUL, SELF LOAD/UNLOAD M967 AND M967A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, AUTOMOTIVE M969 AND M969A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, UNDER/OVERWING AIRCRAFT M970 AND M970A1
TECHNICAL MANUAL; OPERATOR’S, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1990
TM-9-2330-356-14 - Page 406 of 528
TM 9-2330-356-14
(d)
Repair minor damage to the cylinder
head castings using a fine file, emery cloth, or crocus cloth
(item 4, Appendix E) dipped in dry cleaning solvent
(item 11, Appendix E). Repair minor damage to threads
using a proper size tap. Do not enlarge the threaded hole.
If minor damage cannot be repaired, replace cylinder head
casting (16) and valve seats (7). Salvage all other usable
components.
(e)
Inspect studs (11) for stripped or worn
threads, or a bent or loose connection. Replace studs if
damaged, using anti-seize compound (item 5, Appen-
dix E). Tighten rocker arm studs to 35-40 lb.-ft.
tool. Allow valve guide to remain 0.3437-inch from top of
cylinder head.
(d)
Ream the replacement valve guide, if
necessary, to obtain proper valve stem-to-valve guide
clearances shown in table 7-2.
(e) Inspect valve (8 and 10, fig. 7-55) for
warped stem, pitting, evidence of burning and excessive
wear. Replace valves if badly damaged or if valve stem is
worn beyond tolerances shown in table 7-2.
CAUTION
(2)
Valve Guide and Valve.
(a)
Check for valve stem-to-valve guide
allowable clearance by measuring inside diameter of valve
guide (6 and 9, fig. 7-55) and outside diameter of the valve
stem. Refer to table 7-2 for correct dimensions.
NOTE
If valve stem Is worn below minimum toler-
ances, replace the valve. If new valve fails to
correct stem-to-valve guide clearance, re-
place valve guide.
(b)
Using Correct size valve guide driver tool
(table 5-1 and 13, fig. 7-55), remove the valve guide.
(c)
Install new replacement valve guide
through top of cylinder head using the valve guide driver
If grinding on valve face produces a valve
with a thin edge, replace with a new valve.
(f)
Repair valves that can be refaced
grinding to the requirements shown in figure 7-56.
(3)
Valve Seat.
(a)
Inspect valve seats. Reface valve seats if
seat face is slightly pitted, burned, or worn and can be
refaced to requirements in figure 7-56. If valve seats are
loose, they must be replaced as follows:
(b)
Secure valve seat remover cutter tool
(fig. 7-57) in a drill press chuck and adjust tool to cut
1/64-inch from outside edge of valve seat.
(c)
Apply oil to pilot end of cutting tool to
prevent seizing in the valve guide (fig. 7-55).
Figure
7-56.
Valve Face and Valve Seat Grinding Requirements.
7-50
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