Leak Test Of Selector Valve; Disassembly Of Cross-Feed Valve - Piper Navajo PA-31 Service Manual

PIPER NAVAJO SERVICE MANUAL
e.
Ascertain that the shaft (4) is in place and install cover (6). Secure with
screws
(13).
f. Slide the spacer
(8) and gear (21) on the shaft, with the pin holes aligned
so that the gear teeth are opposite the selector
lever (5). Secure the gear with
roll pin (3).
g. Install the "O" ring packing (18) on the cap assembly.
h. Place the selector
handle in neutral
in relation to the cap and install the
cap assembly
in the valve body.
Secure the cap assembly
with screws (14) and
washers
(15).
i.
Check valve operation.
9-20. LEAK TEST OF SELECTOR VALVE. (SCOTT)
a. Connect the inlet port of the valve assembly to a 25 psig air source.
b. Plug the right hand port and close the left hand port by placing
the control
lever to the right.
c. Apply pressure
to 25 psig.
There shall be no evidence
of leakage
either
through
the port or around the fitting and lever when submerged
in kerosene
or
similar
petroleum-base
fluid for 30 seconds.
d.
Depressurize,
remove
the plug from the right
hand port, place on left
hand port and close right hand port by placing the lever to left.
e. Repeat step c.
f.
Disconnect and wipe fluid from exterior.
252 9-21. DISASSEMBLY OF CROSS-FEED
VALVE.
(Refer to Figure
9-7.)
a. Disconnect
the control
arm (10)
from the valve stem (2) by removing
nut (9) from the pin (8).
b. Push the stem out of the valve
body (3).
c. Remove
seal(s)
requiring
re-
placement.
d. If seat valve (4) is removed,
re-
place "O" ring packing (6).
1. WASHER
7.
PACKING
2. STEM,
VALVE
8. PIN
3.
BODY, VALVE
9.
NUT
4. SEAT, VALVE
10. ARM,
CONTROL
5. PACKING
11.
SEAL, OUTER
6. PACKING
12. SEAL,
INNER
Figure 9-7.
Cross-feed
Valve
Reissued: 10/12/79
FUEL SYSTEM
3B13