Cessna T188C - Removal and Installation of Fuel; Shut-Off Valve (Metal Tank); Vented Fuel Filler Caps (Thru 18803296); Description

MODEL
188
& T188
SERIES
SERVICE
MANUAL
12-19.
FUEL
CELL
INSTALLATION.
WARNING
a.
All
filings.
trimmings,
loose
washers,
bolts,
Refer
to
page
iv prior
to fuel
system
nuts.
etc. must
be
removed
from
fuel
cell
compart-
component
maintenance.
ment
before
installing
fuel
cell.
b.
All sharp
edges
and protruding
rivets
must
be
b.
Remove
plate
immediately
aft
of hopper
on
rounded
off
and taped
over
for
protection
to fuel
cell.
lower
fuselage
skin.
c.
Inspect
cell
compartments
just
prior
to installa-
c. With
shut-off
valve
in "ON"
position,
drain
fuel
tion
of a cell
for
the conditions
mentioned
in the
pre-
from
reservoir
tank
and
lines
with strainer
drain
ceding
steps.
control.
To
expedite
fuel
draining,
remove
plug
d.
Install
fuel
drain
adapter.
from
bottom
of reservoir
tank.
e.
Check
to insure
cell
is warm
enough
to be
flex-
d. Disconnect
control
from
valve
handle.
ible
and
fold
as
necessary
to fit
through
fuel
cell
ac-
e.
On
aircraft
thru serial
18800572,
disconnect
cess
opening.
fuel
line
from
valve,
and
remove
valve
from
bottom
f.
Place
fuel
cell
in compartment,
develop
it out
to
of
reservoir
tank.
its full
size
and
attach
fasteners,
then
reverse
the
pro-
f.
Beginning
with
aircraft
18800573
disconnect
fuel
cedures
outlined
in paragraph
12-18
for
installation,
line
and
control
from
valve.
g.
Install
all
new
gaskets
when
installing
fuel
cell.
g.
Disconnect
control
from
strainer.
Gaskets
to
be installed
dry.
Do not
use
sealer
or
h.
Remove
screw
securing
strainer.
adhesive.
i.
Disconnect
all fuel
lines
and
electrical
connec-
h.
If screw-type
clamps
are to
be used,
apply
a
tions
from
fuel pump.
maximum
of 20
pound-inches
torque
to clamp
screws.
j.
Loosen
clamp
securing
pump.
A light
application
of #10
engine
oil
to the
metal
tube
k. Remove
shut-off
valve,
fuel
strainer
and
pump
aids
the
installation
into the
nipple
fittings.
from
aircraft
as a
unit.
i.
When
installing
filler
adapter,
cover
plate,
and
1. Reverse
preceding
steps
for installation.
fuel
quantity
transmitter
to
the wing
and
fuel cell,
tighten
attaching
screws
evenly.
The
sealing
or
com-
12-22.
VENTED
FUEL
FILLER
CAPS.
(THRU
pression
surfaces
must
be
assembled
when
absolutely
18803296.)
dry
(NO
SEALING
PASTE
TO BE
USED).
j. After
installation
has been
completed,
cell should
12-23. DESCRIPTION.
The
filler cap
assemblies
be inspected
for final
fit within
compartment,
making
may be
constructed
of
either
metal
or red plastic.
certain
that cell
is extended
out to the
structure
and
Both cap
assemblies
incorporate
a vent
safety
valve
no corners
are
folded in.
that provides
vacuum
and positive
pressure
relief
for
k.
The final
inspection,
prior to
closing
the cell,
their
respective
fuel
tanks.
It is important
that both
should
be a close
check
to insure
that
cell is free
of
type
caps
to be cleaned
on
as required
basis,
if pro-
foreign
matter
such as
lint,
dust,
oil,
or any
install-
per
filler
cap
sealing
is
to be
maintained.
ation
equipment.
If
a cell
is
not thoroughly
clean,
it
should
be cleaned
with
a lint-free
cloth,
soaked
in
12-24.
METAL
"FLUSH-TYPE"
FILLER
CAPS.
water. alcohol,
or kerosene.
NO OTHER SOLVENT
Except for minor
differences
in construction
and
SHALL BE
USED.
weight, metal
fuel filler caps
perform the
same
function
as red
plastic
fuel
filler
caps.
The
caps
NOTE
are interchangeable
and
will fit the
same adapter
assembly.
Throughout
the aircraft
fuel
system,
from
the
cells
to the
engine-driven
pump,
use NS-40
12-25. INSPECTION.
(RAS-4)
(Snap-On-Tools
Corp.,
Kenosha,
Wis-
consin),
MIL-T-5544
(Thread
Compound,
Anti-
NOTE
seize.
Graphite-Petrolatum)
or
equivalent
compound
as
a thread
lubricant
or
to seal
a
If fuel
collects
in
the handle
well
it could
in-
leaking
connection.
Apply
sparingly
to male
dicate
stem
O-ring
leakage.
Fuel
collecting
fittings
only, omitting
the
first two
threads.
around
perimeter
of cap
could
indicate cap
Always
insure
that a
compound,
the
residue
O-ring
or check
valve
leakage.
from
a
previously
used
compound,
or any
other
foreign material
cannot
enter
the system.
a.
Remove fuel
cap from
adapter
(8), remove
safe-
ty chain
(11)
from
cap
and
cover
or
plug
fuel
opening
12-20.
REMOVAL
AND
INSTALLATION
OF FUEL
to keep
out
foreign
matter.
SHUT-OFF
VALVE. (METAL
TANK).
b. Remove
nut (10) and,
observing position
of lock
a. Drain fuel
tank as outlined
in paragraph
12-14.
plate (6) in relation
to stem
(14) disassemble
cap.
b. Disconnect
control from valve
handle.
c.
Note resiliency
of O-rings (3
& 13) and condition
c
Disconnect fuel line from valve
and unscrew of grooves.
If the O-rings (3 & 13) have
deteriorated
valve from
bottom of tank.
they must be replaced.
d.
Reverse the
preceding steps
for installation.
12-26.
CLEANING.
12-21.
REMOVAL
AND
INSTALLATION
OF
FUEL
a. Using
a cotton
swab
and
Stoddard
solvent
or
SHUT-OFF
VALVE.
(RUBBERIZED
CELL).
equivalent,
gently lift
edges of rubber
umbrella (5)
a. Drain
fuel
from wing
cells
at cell
drain plugs.
and
clean
stainless
steel
seat and
umbrella
removing
12-17