TM-9-2815-213-34
ENGINE, DIESEL, WITH ACCESSORIES CUMMINS MODEL V8-300 (2815-910-8217)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL (INCLUDING DIRECT SUPPORT AND GENERAL SUPPORT REPAIR PARTS LIST AND DEPOT MAINTENANCE ALLOWANCES)
FEBRUARY 1972
TM-9-2815-213-34 - Page 44 of 192
•TM 9-2815-213-34
3-60. Inspection
a
.
Perform inspection in accordance with the
instructions contained in paragraph 26.
b
.
Check for scored, flaked, or chipped rollers on
bearing sleeves. Discard damaged parts.
NOTE
If any of the above conditions exist,
camshaft
should be inspected very
closely for damage.
c.
Measure tappet body outside diameter for wear.
Measure roller and bearing sleeves od and id for wear.
Discard if worn beyond limits contained in repair and
rebuild standards paragraph 3-183.
d
.
Check tappet sockets by "bluing" corresponding new
push rod on ball end and rotating in tappet. A full seat
should be indicated.
e
.
Check body pin holes and inspect hole for burrs
before reassembly.
3-61. Repair
No repair procedures beyond those specified
in
paragraph 2-7 are authorized for tappets.
3-62. Assembly
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
body lubricating oil passages.
b
.
Check freeness of roller by rotating two or three
turns. If "drag" is felt, the plating on the pin has probably
picked up burrs during assembly or pin is not being held
securely during assembly.
c.
Stand small V block on surface plate.
d
.
Stand tappet assembly on surfacing plate with
roller up. Secure tappet in V block with clamp.
e
.
Using dial indicator gage (calibrated in tenths of
a
thousandth inch) check concentricity of rotating roller.
CAUTION
Injector and valve tappet dimensions are
not alike. Use correct dimensions when
checking wear.
NOTE
Roller eccentricity of the injector tappet
cannot exceed 0.005 inch, the valve
tapped cannot exceed 0.001 inch. Move
indicator to a new location and recheck.
f.
Using same indicator check squareness of roller
by sweeping indicator across diameter or end of roller,
then sweeping the other end. Rotate tappet roller 180
degrees and check again at roller ends by sweeping
across the diameter.
Roller squareness must not exceed
0.001 inch in either injector or valve tappet assemblies. It
is recommended to extend some downward pressure
against the roller when gaging to assure firm contact.
NOTE
Assemblies
that
do not pass the
inspections
above
must
be
disassembled,
(perform
inspection
during disassembly to determine the
cause for rejection) reassembled, and
reinspected.
Figure 3-24. Tappet assembly test.
3-63. Installation
a
.
Install new retainer spring on each tappet (31
and 35, fig. B-6).
b
.
Install tappets in tappet bores of block, refer to
paragraph 2-ll.g. Injector tappets are larger
3-15
Back to Top
