Cleaning, Inspection And Repair Of Fuel Filter; Assembly Of Fuel Filter - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
1. BODY FILTER
2 O-RING SEAL
3. OUTER TUBE
4. NUT
5. STUD
6 FILTER DRAIN
7. CAP NUT
8. SPRING
9. REUEF BALL
10. REUEFSEAT
11. FILTER DISCS
12. WASHERS
13. RETAINER CUP
14. CHECK NUT
15. FILTER BOWL
16 GASKET
17. SAFETY WIRE
Figure 9-10. Adjustment of Crossfeed Valve
Figure 9-11. Fuel Filter
9-45.
CLEANING, INSPECTION AND REPAIR OF THE FUEL FILTER. (REFER TO FIGURE 9-11.)
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 O-ring seal (2) and gasket (16).
d. Check condition of bowl drain and internal drain O-ring.
e. Check for corrosion of filter parts.
f. Check movement of bypass 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.
9-46. ASSEMBLY OF FUEL FILTER. (REFER TO FIGURE 9-11.)
a. If removed, install bypass valve spring (8), relief ball (9) and seat (10).
b. Place the filter cartridge (assembled) on the housing stud (5). Ascertain that the end of the outer
tube (3) has positioned itself in the filter body (1).
c. Secure the filter cartridge with nut (4). Torque nut 10 to 15 inch-pounds. Torque check nut (14)
against nut (4) 40 to 60 inch-pounds.
d. Place O-ring seal (2) on housing and install bowl (15), gasket (16) and cap nut (7). Torque cap
nut 60 to 80 inch-pounds and safety.
e. Install the filter. If the filter was not removed, proceed to step c of paragraph 9-47.
Revised: 3/31/94
FUEL SYSTEM
2K24