Piper Navajo PA-31 Service Manual page 591

PIPER NAVAJO SERVICE MANUAL
9-7. INSTALLATION
OF WING FUEL CELL. (Refer to Figures 9-2 and 9-3.)
a.
Inspect the cell compartment as explained in Paragraph 9-5.
b.
Install two 4 inch strips (side by side) of Ludlow two sided adhesive transfer tape
No. 7322, P/N
189 704, to the fuel liner at a point directly beneath the location of the fuel
indicator sender unit float in
"empty" position. Leave the backing on the tape to prevent adherence to the
cell until the cell is properly
positioned.
c. Should the cell be in its shipping container, do not remove until ready for installation.
d. Check to be sure that the cell is warm enough to flex. Do not use sharp tools such
as screwdriver,
files. etc., for installation purposes.
e.
Place tape or another protective material over the edges of the elongated access
opening to
prevent damage to the cell.
f. Roll the cell into the shape and size which can be inserted through the access opening
of the cell
compartment.
g. Unroll the cell and establish correct relationship of the cell to the compartment. Insure
bottom
of fuel cell is smoothed out and free of wrinkles.
h. Remove the backing from the tape installed in Step b Press the cell to the exposed
tape on the
cell liner
i.
Lay out the nylon cord on the wing to determine the length of cord for each tie.
The cords are
routed as shown in Figures 9-2 or 9-3. Allow enough extra cord to work with.
NOTE
The nylon cord used to hold the fuel cells is .125 in diameter with a
minimum breaking strength of 550 pounds and should conform to
MIL-C-5040C Type III specifications. It is obtainable through
Goodyear.
j.
Double tie a washer (AN960-416) securely to the ends of each cord. Reach
through the access
openings and start the cord through the spar bushing at each end of the cell compartment.
k. From each end of the cell, feed the cord through the cell hangers and rib bushings
until the cords
can be joined at the access opening. Do not tie cords yet.
1.
Connect the fuel drain valve plate by inserting the threaded end of bolt or
rod not under three
inches long up through the plate and nipple fitting of the fuel cell. (Refer to Figure
9-4.) Reach through the
fuel cell opening and install a two to two and one-half inch diameter washer
on the bolt or rod and secure
with a nut. Pull the nipple down through the opening in the wing panel enough
to clamp the nipple fitting
to the plate. Remove the bolt or rod; secure plate to wing panel and install drain
valve.
m. Connect the fuel outlet with finger strainer and vent tube to the molded nipple
fittings and
secure. (Refer to Paragraph 9-6.)
NOTE
Install the vent line check valve with the "B" identification mark
on the valve bottom.
n.
Wipe the inside of the cell clean of all dirt and foreign material with a clean, soft,
lint-free tack
cloth and inspect for cleanliness.
o. Install the fuel cap adapter bracket by wrapping the bracket with a protective cover
so as not to
damage the cell, insert it through the elongated access opening and slide it
in position. Install the gasket
between the bracket and cell and start the cap bolts that attach the bracket to the
cell. Align the holes in
the adapter with the holes in the skin bracket and torque cap bolts to 35 ± 5 inch-pounds.
Revised: 1/29/82
FUEL SYSTEM
FUEL SYSTEM
3A23