Piper Navajo PA-31 Service Manual page 614

PIPER NAVAJO SERVICE MANUAL
255
1 BODY, FILTER
2
2. "0"~
RING
SEAL 10 10. SEAT, RELIEF
3. TUBE, OUTER DISCS, FILTER
4. NUT 12. WASHERS
5. STUD 13. CUP, RETAINER
6. DRAIN, FILTER
14. HUT, CHECK
7.
NUT
13
15.
BOWL, FILTER
B. SPRING
4 16.
WASHER
8. BALL RELIEF
4
14 17. SAFETY WIRE
9. BALL, RELIEF
5
6 16
TORQUE 60 TO 80 INCH-POUNDS
Figure 9-11. Fuel Filter
9-35. DISASSEMBLY OF FUEL FILTER. (Refer to Figure 9-11.)
a. Cut safety wire ( 17) and remove cap nut (7) from the bottom of the filter bowl
(15).
b. Remove the bowl from the filter body (1).
c. The "O" ring seal (2) may be removed from the body.
d. Loosen and remove both the check nut (14) and nut (4) from the stud (5) that holds
the filter cartridge subassembly.
e. Slide the filter cartridge from the stud. The filter discs (11) and washers (12) need
not be separated from the element outer tube (3) for normal cleaning.
f.
If necessary to disassemble the filter cartridge, remove the retainer cup (13) from
the outer tube (3) and slide discs (11) and washers (12) from the outer tube. Do not use a
screwdriver or sharp tool that may damage the discs.
g. The filter by-pass assembly may be removed by using the proper size screwdriver and
turning out the relief seat (10). Remove relief ball (9) and spring (8).
9-36. CLEANING, INSPECTION AND REPAIR OF THE FUEL FILTER.
a. Wash the element in oil solvent such as mineral spirits. (It is not necessary to remove
discs from element outlet tube for normal cleaning.) Plug open ends of element outlet tube
while washing to keep out dirt.
b. Inspect filter discs for damage and broken screens.
c. Check condition of bowl gasket (2) and washer (16).
d. Check condition of bowl drain and drain "O" ring.
e. Check for corrosion of filter parts.
f. Check movement of by-pass valve.
g. Check condition of filter rubber shock mounts.
h. Normal repairs necessary for the filter are replacement of bowl gaskets and damaged
filter discs.
Reissued: 10/12/79
3B22
FUEL SYSTEM
3B22