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TM 9-2815-213-34
e. Using dial indicator gage (calibrated in tenths of
3-60. Inspection
a thousandth inch) check concentricity of rotating roller.
a. Perform inspection in accordance with the
instructions contained in paragraph 26.
CAUTION
b. Check for scored, flaked, or chipped rollers on
Injector and valve tappet dimensions are
bearing sleeves. Discard damaged parts.
not alike. Use correct dimensions when
checking wear.
NOTE
NOTE
If any of the above conditions exist,
Roller eccentricity of the injector tappet
camshaft should be inspected very
cannot exceed 0.005 inch, the valve
closely for damage.
tapped cannot exceed 0.001 inch. Move
indicator to a new location and recheck.
c.  Measure tappet body outside diameter for wear.
Measure roller and bearing sleeves od and id for wear.
f.  Using same indicator check squareness of roller
Discard if worn beyond limits contained in repair and
by sweeping indicator across diameter or end of roller,
rebuild standards paragraph 3-183.
then sweeping the other end. Rotate tappet roller 180
d. Check tappet sockets by "bluing" corresponding new
degrees and check again at roller ends by sweeping
push rod on ball end and rotating in tappet. A full seat
across the diameter. Roller squareness must not exceed
should be indicated.
0.001 inch in either injector or valve tappet assemblies. It
e. Check body pin holes and inspect hole for burrs
is recommended to extend some downward pressure
before reassembly.
against the roller when gaging to assure firm contact.
NOTE
3-61. Repair
Assemblies  that  do  not  pass  the
inspections
above
must
be
No  repair  procedures  beyond  those
specified
in
disassembled,
(perform
inspection
paragraph 2-7 are authorized for tappets.
during disassembly to determine the
cause for rejection) reassembled, and
3-62. Assembly
reinspected.
a. Press new injector roller on bearing sleeve in tappet
until securely seated.
CAUTION
Lubricating oil passage in pin must be
alined for proper lubrication.
b. Insert 0.006 inch shim between side of roller or
sleeve and tappet fork. Press pin through body and roller
with lockwire in pin.
362. Testing
NOTE
Tests of either the injector or valve
tappet assemblies require a surface
plate, small V block with clamp (to hold
tappet in position), and dial indicator
calibrated in tenths of a thousandth inch
attached to a surface plate (fig. 3-24).
a. With a small wire, check indexing of pins and
Figure 3-24. Tappet assembly test.
body lubricating oil passages.
b. Check freeness of roller by rotating two or three
3-63. Installation
turns. If "drag" is felt, the plating on the pin has probably
a. Install new retainer spring on each tappet (31
picked up burrs during assembly or pin is not being held
and 35, fig. B-6).
securely during assembly.
b. Install tappets in tappet bores of block, refer to
c.  Stand small V block on surface plate.
paragraph 2-ll.g. Injector tappets are larger
d. Stand tappet assembly on surfacing plate with
roller up. Secure tappet in V block with clamp.
3-15

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