TM 9-2320-363-34-2
NOTE
It may be necessary to restore injector tube counterbore when cylinder head is
resurfaced.
13. MAKE SURE COUNTERSINK INJECTOR TUBE BORES (21) LAND WIDTH OF 0.040-0.080 IN.
(1.0-2.0 mm) (22) X 45 DEGREES (23).
NOTE
If cylinder head fire deck has been resurfaced, valves must be seated deeper to
restore valve head recess depth to specification limits. Do not grind new valve
seat inserts for this purpose. Reduced-thickness valve seat inserts are available
0.010, 0.020, and 0.030 in. (0.254, 0.508, and 0.762 mm) shallower than
standard.
14. MAKE SURE VALVE HEADS (24) ARE RECESSED FROM CYLINDER HEAD (2) FIRE DECK
SURFACE BY 0.055-0.067 IN. (1.4-1.7 mm) MINIMUM. IF NOT, INSTALL REDUCED-THICKNESS
VALVE SEAT INSERTS.
12-21
