Assembly - TM-9-2815-213-340054

*TM 9-2815-213-34

plunger may be reused. If worn excessively, place

h. Place new retaining ring on new plunger link and

body and plunger.

press link into place. Press retainer flush to 0.010 inch below

(3) Narrow streaks running the length

bore surface.

plunger usually are the result of varying thick- ness of

i. Select cup of proper size (fig. 3-57) and in- stall

penetrate treatment used to prevent rust ing.

finger tight on injector body. Apply tension to aline plunger in

Plunger is satisfactory for reuse unless surface

body, back off % turn, tighten with cup wrench (30, fig. B-28)

distortion is evident.

to 55 foot- pounds as shown in figure 3-50.

d. Injector Spring.

(1) Check spring for excessive wear breaks.

NOTE

(2) Test spring tension on spring tester that

is capable of very accurate measurements of spring

Spring tension in tool is controlled by spacers

lengths and applied load by means of standards and

marked by the engine model which alines plunger

dial indicator gage.

and cup when per- forming above operation.

(3) If injector springs compress to dimen-

sions at less than loads given in repair and re- build

CAUTION

standards, springs must be replaced.

3-75. Repair Repair of the injector assembly is

If cup is replaced, always use identical

limited to re- placement of spare parts and general

replacement cup.

repair pro- cedures in accordance with paragraph 2-

j. Check injector assembly plunger seating on test

stand as described in paragraph 3-77.a.

3-76. Assembly

k. Remove injector plunger from body. Lubri-

(fig. 3-53).

cate plunger with test oil. Install injector spring

a. Drop check ball into bore in top of injector

and plunger in body. Check to see that it does

body.

not bind as it seats in cup.

b. Using check ball seating tool (5, fig. B-

l. Check cup spray pattern as described in test

28)

section. If spray pattern tools are not available,

screw down against ball and tighten to 30-40 in-

fill injector body two-thirds full of clean fuel.

lb torque as shown in figure 3-54.

Insert plunger forcing fuel out cup spray holes to

c. Install retainer plug, with a new gasket,

see that they are open and clean.

and

3-77. Test and Calibration

tighten to 30-40 inch pounds.

a. Injector Plunger Seat Test.

d. Lubricate new injector body O-ring with

(1) Install injector assembly on test stand

OE-30 oil.

as shown in figure 3-58.

e. Using O-ring tool (39, fig. B-28), slide O-

ring onto injector body as shown in figure 3-55.

NOTE

Figure 3-56 illustrates the injector checking fixture

NOTE

currently in use in the Army supply system and is

available through normal supply channels.

If sealing surface of PT (type C) cup is

slightly damaged, use lapping blocks and

(2) Attach 80/90 p.s.i. air supply to test stand air

mixture of 600 grit lapping compound and

coupling.

OE-30 lubricant to smooth cup. Oscillate

(3) Remove spring and plunger from the assembled

cup on block, applying light pressure.

injector and re-install plunger only in the injector body.

Clean thoroughly before in- stalling.

(4) Place injector in test set-up with cup seated in the

counterbore below the air valve.

f. Select plunger and body with same size

(5) Install cylindrical injectors with drain and outlet

markings (fig. 356), immerse injector plunger

holes up.

in clean injector test oil.

(6) Position injector plunger with size mark centered

g. Install plunger in injector body from which

between the injector inlet and drain openings. Fill opening

it was removed and place injector in fixture (fig.

with fuel oil and operate plunger several times to purge any

3-50).

air trapped in injector.

NOTE

(7) Seat handle against injector plunger

Oil injector cup and retainer with OE-

30 oil before assembly.

3-25