Disassembly Of Emergency Shut-Off Valve; Cleaning. Inspection And Repair Of Emergency Shut-Off Valve; Leak Test Of Emergency Shut-Off Valve - Piper Navajo PA-31 Service Manual

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1. BODY, VALVE
2. VALVE
3. SNAP RING
6
4. STOP
5. PIN
6. ARM
7. "O"
RING
8. "O" RING
9. SNAP RING
7
7
Figure 9-8. Emergency Shut-Off Valve
9-25. DISASSEMBLY OF EMERGENCY SHUT-OFF VALVE. (Refer to Figure 9-8.)
a. Remove the snap ring (3) on the bottom of the valve.
b. Push the valve (2) from the valve body (1).
c. Remove and discard the "O" rings (7 and 8).
9-26. CLEANING, INSPECTION AND REPAIR OF EMERGENCY SHUT-OFF VALVE.
a. Clean the valve components in a suitable cleaning solvent.
b. Inspect the valve for the following:
1. Check that the valve and valve body stop pins are not bent, broken or missing.
2. Check that the handle is not loose on the valve.
3. Check that the valve and inside of the valve body is free of scratches, burrs, etc.,
that may damage the "O" rings.
c. Repair to the valve is limited to reconditioning of parts, such as smoothing out
minor nicks and scratches, and replacing of "O" rings.
9-27. ASSEMBLY OF EMERGENCY SHUT-OFF VALVE. (Refer to Figure 9-8.)
a. Ascertain that the snap ring (9) is installed on the upper portion of the valve (2).
b. Place new "O" rings (7 and 8) on the valve.
c. Lubricate the "O" rings with Dow Corning DC-55 (MIL-G4343) and insert the valve
(2) in the valve body (1). Place the valve so that the valve is allowed only 90 °
travel between
stops.
d. Lock the valve in the valve body by installing the snap ring (3) on the valve.
9-28. LEAK TEST OF EMERGENCY SHUT-OFF VALVE.
a. Connect the inlet port of the valve to a 50 psig air source.
b. Close valve, apply pressure to 50 psig and submerge in kerosene or similar petroleum
base fluid for two minutes.
c. There should be no evidence of leakage through the valve port or around seat.
d. Disconnect and wipe fluid from exterior.
Reissued: 10/12/79
FUEL SYSTEM
PIPER NAVAJO SERVICE MANUAL
3B15