| Tweet |
Custom Search
|
|
|
||
 a vise between two pieces of wood. Start injector rack (7) in
dislodge the spray tip and other parts resting on the end of the
rack opening with timing marks up. Place a new seal ring (9)
plunger bushing. If the injector has been in service for a long
on the injector body.
period of time, the spray tip may stick in the injector nut.
(6) Insert gear (26) in injector body with timing
(6) Carefully lift the spray tip (16), check valve
mark on gear registering with the timing marks on injector
(17), valve cage (14), valve stop (15), spring (18), injector
rack. Place gear retainer (24) in injector body against gear.
valve (19), and valve seat (20) from bushing (23).
(7) Insert small end of plunger bushing (23) in
(7) If spray tip remained in the injector nut. it may
injector body with the plunger locating pin aligned with the
be removed with tool (table 4-1).
locating groove in injector body.
(8) Remove the spill deflector (21) and seal ring
(8) Place valve seat (20) on finished surface of
(9) from injector nut.
plunger bushing. Set finished surface of valve (19) on valve
(9) Remove plunger bushing (23), gear retainer
seat followed by valve spring (18). Insert lower end of valve
(24) and gear (26) from injector body.
stop (15) into opposite end of spring.
(10) Withdraw injector control rack (7) from injector
(9) Place valve cage (14) over valve stop and
body.
against valve seat.
d. Cleaning, Inspection, and Repair.
(10) Set check valve (17) on valve cage and place
(1) Wash all injector parts thoroughly in clean fuel
spray tip (16) over check valve against valve cage.
oil. and dry with filtered compressed air. All parts must be
(11) Insert spill deflector (21) into injector retainer
kept absolutely clean.
nut (25).
(2) Check seal ring area of injector body for burns
(12) Being careful to prevent dislodging the spray
or scratches.
tip and valve assembly, lower injector nut over spray tip and
(3) Inspect teeth on control rack and control rack
down against injector body. Screw injector nut in body
gear for wear or damage. If defective, a new rack and gear
approximately five full turns.
must be installed.
(13) Hold injector, right side up, and tighten nut
(4) Inspect spray tip and tip of seat of injector nut
finger-tight, then torque to 65 foot-pounds.
for carbon deposits. Examine the sealing surfaces of the
(14) Support injector right side up in a vise
spray tip and valve parts.
between two blocks of wood, and place spring (29) over
(5) Sealing surfaces should be examined with a
plunger follower opening in injector body.
magnifying glass.
Slight imperfections will prevent the
(15) Insert head of plunger (27) in lower slot of
injector from operation properly.
injector follower (1). Align flat on injector plunger with stop
(6) Clean injector nut with reamer tool (table 4-1).
pin slot in follower.
The large shoulder on body of reamer tool fits in the shoulder
(16) Position rack in full fuel position and lower
of the injector nut to keep tool properly aligned. Turn reamer
plunger and follower into injector body with flat on plunger
in a clockwise direction to remove carbon deposits.
registering with flat in rack gear.
(7) Insert reamer in opening of spray tip. Turn
(17) Start stop pin (28) in injector body with lower
reamer in a clockwise direction to remove carbon deposits.
coil of spring resting on narrow shoulder of stop pin. Depress
Clean spray tip orifices. Before using the tool, sharpen tip end
the follower and push follower stop pin into position.
of wire with stone.
f. Testing. After an injector has been reconditioned, it
(8) Clean plunger bushing and rack openings in
must be tested prior to placing in service. When in doubt as
the injector body using tools (table 4-1).
to condition of an injector, it must be tested to determine if
e. Assembly.
reconditioning is required. Six individual tests are preformed
(1) Support injector body in a vise between two
to ascertain: rack freeness, plunger freeness, spray pattern,
pieces of wood right side up.
valve opening pressure, holding pressure, and high pressure.
(2) Insert a new filter element in each fuel
Test fixture tool (table 4-1) is needed to test injector.
opening. If used oil filters are being reinstalled, be sure each
(1) To test injector, install the injector in test
filter is being replaced in the opening from which removed and
fixture (fig. 5-43) with dowel on underside of injector located
with the same side up.
in proper hole of fixture. Position the injector support and
(3) Place a filter spring in each fuel opening.
popping handle support.
(4) Place a new gasket over lower end of each
filter cap and thread caps into fuel openings. Tighten caps to
75 foot-pounds.
(5) Support injector body, bottom side up, in
5-52
|
||
|
||
