TM 5-3810-295-34
i. From valve tappets (13) remove lock wire (14),
(2) Check sockets of push rods with a one-half
roller pins (15), and valve rollers (16) using the same
inch "bleed" check ball, which should "blue" 80% of the
procedures outlined for injector tappets.
seat area. Extreme wear on either end of push rods will
j. Remove injectors by removing screws (17),
result in loss of lubricating oil pressure and may not
washers (18), clamps (19) and spacers (20).
permit proper injector and valve adjustment. Replace
push rods that indicate extreme wear.
CAUTION
(3) With push rods supported at ends by pivot
Do not use screwdriver or other hard objects
points having a common axis, and with a dial indicator
in adapter locating holes during injector re-
placed midway between ends, check run-out. Run-out
moval.
must not exceed 0.025 inch total indicator reading
k. Using a suitable injector removing tool, lift injec-
when rod is rotated 360. If this cannot be met, rod is
tor assembly from the cylinder head.
bent and must be replaced.
l.
Remove injector link (21) from injector
g. Cheek injector components as outlined.
assembly.
(1) Check injector link for wear. Replace if
NOTE
wear appears excessive.
Injector barrels and plungers are class fit; do
CAUTION
not interchange.
Injector plunger must be handled with care to
m. Remove injector plunger (22) and spring (23).
prevent damage which could render it useless.
Store plunger by standing on coupling end.
(2) Check injector plunger coupling closely for
n. Remove and discard preformed packing (24)
metal seizure. This will indicate any scuffing and scor-
and (25).
ing.
o. Remove screen clip (26) and filter screen (27).
(3) Check for metal displacement or
Discard screen if damaged. Do not remove adjustable
measurable wear at top of machined area of plunger, on
orifice plug (28) and gasket (29) from inlet groove.
opposite side at bottom of plunger or at mid-point. If
p. Screw off cup retainer (30) and remove cup (31),
worn excessively, replace and return for fitting of a new
barrel (32) and check ball (33).
plunger.
q. Remove spiral pins (34) from adapter (35).
(4) Replace if a noticable surface disruption is
14-13. Cleaning, Inspection
evident along the plunger length.
a. Clean all parts in cleaning solvent, Federal
(5) Check area where plunger is swaged to
Specification P-D-680, or equivalent before inspecting.
coupler for cracks and looseness, by attempting to rotate
b. All carbon varnish must be removed from
by hand.
injector parts. Injector barrel, plunger, and cup should be
(6) Check spring for excessive wear or
cleaned in an ultra-sonic bath.
mutilation.
c. Using a small wire, clean the injector cup spray
(7) Check injector springs on an accurate
holes. Care must be taken not to alter the size of the
spring tester. Replace any spring that compresses to
spray holes.
1.663 inches under a load of less than 138 pounds.
d. Dry all parts with clean compressed air.
(8) Inspect injector cup spray holes and tip with
e. Inspect tappet assembly components as follows:
a magnifying glass. Discard cup if there are indications
(1) Tappet sockets shall be checked by
of abrasive wear, corrosion damage, excessive heat, or
"bluing" the ball end of the corresponding push rod and
distorted spray holes.
rotating in tappet; a full seat should be indicated.
(9) Inspect cup for plunger seat pattern. If
Replace tappet socket if worn excessively.
plunger seat covers less than 40 percent continuous
(2) Check for scored, flaked or chipped rollers,
area around cup, cup cone, or plunger bore, it must be
discard damaged parts.
replaced (fig. 14-9).
(3) Using an accurate micrometer, measure
the tappet body outside diameter for wear. Replace
body if measurement is less than 1.3965 inches.
(4) Measure rollers outside and inside
diameters. The outside diameter shall be greater than
1.1670 inches. The inside diameter shall be less than
0.6300 inch. Roller must be replaced if these
requirements are not met.
f. Check push rods as described in the following
steps.
(1) Check injector and valve ball end with a
radius gauge. Ball end radius shall measure 0.3110-
Figure 14-9. seat pattern of plunger in cup
0.3125 inch. Socket end radius shall be 0.250--0.252
inch. If these readings are not met, replace push rod.
14-9
TM 5-3810-295-34
