TM 5-3810-289-34
head,
Figure 3-72. Tachometer gear begin pressed.
Figure 3-71. Spring dowel installation in bottom of fuel
pump housing.
(1) Install lower screen; one with holes in
each end.
(2) Install screen retainer and new O-ring
packing.
(3) Install upper screen; hole down.
(4) Install spring.
(5) Lubricate new O-ring packing and place
on cap.
(6) Install cap and torque to 25/30 ft. lbs.
3-12. Tachometar Drive
Figure 3-73. Tachometer gear.
a. Removal Refer to paragraph 3-2
b. Disasse7n !9.
(1) Remove oil seal from tachometer drive
(3) Number each injector according to the
shaft.
cylinder from which it was removed; I)lace in drain rack.
(2) Press tachometer drive shaft from drive
c. Disassembly.
gear and bushing if the gear is badly worn or shaft at
(1) Lift out injector plunger and spring.
bushing are galling or scoring check shaft O.D. it should
Remove spring from plunger and then place plunger in
be 0.3100/0.3105 in. and bushing I.D. should be
body.
0.312/0.313 in. Replace if necessary.
Note Injector bodies and plungers are class fit, do
c.
Assembly.
Place bronze bushing on
not interchange.
tachometer shaft with chamfered end of bushing toward
(2) Place injector in ST-569 Holding Fixture
gear end. Press gear onto shaft until flush with end of
so the fixture spring tension is against injector plunger.
shaft, figure 3-72. Check to see that shaft turns freely in
Use spacers listed in table 2-2 to get required spring
bushing.
tension, figure 3-75.
Note. Cheek gear to make sure it matches with
Note. Do not remove adjustable office plug from
tachometer drive gear, figure 3-73.
inlet drilling.
d. Installation. Refer to figure 3-19.
(3) Remove injector cup with injector cup
3-13. Fuel Injectors
wrench listed in table 2-2.
a.
General.
The PT injector is a simple
Caution: Do not place injector body in vise to
mechanical unit which receives fuel from the fuel pump
remove injector cup.
under pressure. It then meters, injects and atomizes it
d. Cleaning.
through five injector cup spray holes into the combustion
(1) Clean injector parts thoroughly of any
chamber.
carbon or varnish by soaking in an approved solvent.
b. Removal
(2) Neutralize solvent after cleaning by
(1) Remove injector holddown capscrews.
dipping parts in mineral spirits.
(2) Pry injectors loose and remove from
(3) Dry with clean compressed air.
Caution: Do not use drills or other instruments
to clean cup holes that will alter size of
3-26
