22.
Washer
KEY to figure 3-8.
23.
Pin
1. Drive shaft
24.
Cover
2. Filter cap
25.
Nut
3. Packing
26.
Adjustment screw
4. Packing
27.
Packing
5. Filter element
28.
Packing
6. Nut
29.
Spring
7. Washer
30.
Nut
8. Fuel solenoid valve
31.
Washer
9. Washer
32.
Screw
10. Fitting
33.
Washer
11. Gasket
34.
Pin
12. Packing
35.
Cover
13. Plug
36.
Nut
14. Gasket
37.
Adjustment screw
15. Plug
38.
Packing
16. Packing
39.
Packing
17. Plug
40.
Spring
18. Packing
41.
Spacer
19. Nut
42.
Diaphragm assy
20. Washer
43.
Housing assy
21. Screw
(6) Remove nut (6), washer (7) and remove
Note
fuel solenoid valve (8) with items (9 through 12)
Do not disassemble the fuel
attached. Remove washers (9). Remove fitting (10)
control assembly further. Refer
from fuel solenoid valve (8) then remove gasket (11)
additional
repair
to
depot
and packings (12) from fitting (10).
maintenance.
(7) Remove plug (13) with gasket (14)
d. Cleaning, Inspection and Repair.
attached, then remove gasket (14) from plug (13).
(1) Cleaning.
Clean all components of
(8) Remove plug (15) with packing (16)
control unit in an approved solvent, except solenoid
attached, then remove packing (16) from plug (15).
valve. Wipe valve with a lint-free cloth dampened in an
(9) Remove plug (17) with packing (18)
approved solvent such as trichlorethylene.
attached, then remove packing (18) from plug (17).
(2) Inspection.
(10) Remove nut (19) and washer (20) from
(a) Visually inspect all parts for obvious
screw (26) in cover (24) to release compression load of
damage, excessive wear, or abnormalities. Inspect
spring (29).
threaded parts for stripped, crossed, or peened threads.
Note
(b) Inspect springs for distortion,
Nut (25) has left-hand thread.
cracks, or other damage.
(11) Remove screws (21) and washers (22)
(c) Check operation of solenoid valve.
and remove cover (24). Do not remove pin (23) from
Apply Test Fluid (Military Specification MIL-T-5624,
cover unless damage is indicated by inspection.
Grade UP-4 or JP-5) to valve inlet at 1003psig
Remove nut (25), screw (26), packings (27), (28), and
pressure.
Energize solenoid with 7.2 volts dc
spring (29).
(maximum) at coil temperature of 80 (27C). Valve
F
Note
shall open. Slowly reduce voltage. Valve shall close at
If flyweight assembly is removed,
4 volts dc or less.
do not disassemble from the
(d) Increase test fluid pressure to 3003
sleeve and bearing.
psig. Maintain coil temperature at 80 F (27 C) and
(12) Remove nut (30) and washer (31) from
energize valve with 9.0 volts de (maximum). Valve
screw (37) in cover (35) to release compression load of
shall open. Slowly reduce voltage. Valve shall close at
spring (40).
4 volts dc or less.
Note
(e) Check leakage of solenoid valve.
Nut (36) has left-hand thread.
Maintain test fluid at 3003psig pressure and check
(13) Remove screws (32) and washers (33)
valve for maximum leakage of 0.5 cc per hour. Reduce
and remove cover (35). Do not remove pin (34) from
test fluid pressure to zero and remove valve from test
cover unless damage is indicated by inspection.
setup.
Remove nut (36), screw (37), packings (38, 39), spring
(f) Check for insulation breakdown of
(40) and spacer (41).
coil of solenoid valve (8). Apply 750 volts rms between
(14) Remove diaphragm assembly (42) from
case and coil for one minute. No shorting is permitted.
housing assembly (43).
(g) Visually inspect shaft (1) for wear,
crack, nicks, or burrs. Check square end of shaft for
0.180 inch minimum across flats and 0.237 inch
3-21
