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 54 of 192
plunger may be reused.
If worn excessively, place
body and plunger.
(3) Narrow streaks running the length
plunger usually are the result of varying thick- ness of
penetrate treatment used to prevent rust ing.
Plunger is satisfactory for reuse unless surface
distortion is evident.
d.
Injector Spring.
(1) Check spring for excessive wear breaks.
(2) Test spring tension on spring tester that
is capable of very accurate measurements of spring
lengths and applied load by means of standards and
dial indicator gage.
(3) If injector springs compress to dimen-
sions at less than loads given in repair and re- build
standards, springs must be replaced.
3-75.
Repair
Repair of the injector assembly is
limited to re- placement of spare parts and general
repair pro- cedures in accordance with paragraph 2-
7.
3-76.
Assembly
(fig.
3-53).
a.
Drop check ball into bore in top of injector
body.
b.
Using check ball seating tool (5, fig.
B-
28)
screw down against ball and tighten to 30-40 in-
lb torque as shown in figure 3-54.
c.
Install retainer plug, with a new gasket,
and
tighten to 30-40 inch pounds.
d.
Lubricate new injector body O-ring with
OE-30 oil.
e.
Using O-ring tool (39, fig.
B-28), slide O-
ring onto injector body as shown in figure 3-55.
NOTE
If sealing surface of PT (type C) cup is
slightly damaged, use lapping blocks and
mixture of 600 grit lapping compound and
OE-30 lubricant to smooth cup.
Oscillate
cup on block, applying light pressure.
Clean thoroughly before in- stalling.
f.
Select plunger and body with same size
markings (fig.
356), immerse injector plunger
in clean injector test oil.
g.
Install plunger in injector body from which
it was removed and place injector in fixture (fig.
3-50).
NOTE
Oil injector cup and retainer with OE-
30 oil before assembly.
*TM 9-2815-213-34
h.
Place new retaining ring on new plunger link and
press link into place.
Press retainer flush to 0.010 inch below
bore surface.
i.
Select cup of proper size (fig.
3-57) and in- stall
finger tight on injector body.
Apply tension to aline plunger in
body, back off % turn, tighten with cup wrench (30, fig.
B-28)
to 55 foot- pounds as shown in figure 3-50.
NOTE
Spring tension in tool is controlled by spacers
marked by the engine model which alines plunger
and cup when per- forming above operation.
CAUTION
If cup is replaced, always use identical
replacement cup.
j.
Check injector assembly plunger seating on
test
stand as described in paragraph 3-77.a.
k.
Remove injector plunger from body.
Lubri-
cate plunger with test oil.
Install injector spring
and plunger in body.
Check to see that it does
not bind as it seats in cup.
l.
Check cup spray pattern as described in test
section.
If spray pattern tools are not available,
fill injector body two-thirds full of clean fuel.
Insert plunger forcing fuel out cup spray holes to
see that they are open and clean.
3-77.
Test and Calibration
a.
Injector Plunger Seat Test.
(1) Install injector assembly on test stand
as shown in figure 3-58.
NOTE
Figure 3-56 illustrates the injector checking fixture
currently in use in the Army supply system and is
available through normal supply channels.
(2) Attach 80/90 p.s.i.
air supply to test stand air
coupling.
(3) Remove spring and plunger from the assembled
injector and re-install plunger only in the injector body.
(4) Place injector in test set-up with cup seated in the
counterbore below the air valve.
(5) Install cylindrical injectors with drain and outlet
holes up.
(6) Position injector plunger with size mark centered
between the injector inlet and drain openings.
Fill opening
with fuel oil and operate plunger several times to purge any
air trapped in injector.
(7) Seat handle against injector plunger
3-25
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