Cessna T188C - Reassembly; Cleaning; Fuel Quantity Transmitters; Fuel Reservoir

MODEL
188
& T188
SERIES
SERVICE
MANUAL
12-30.
CLEANING.
12-32. VENTED
FUEL FILLER
CAPS.
a. Using
a cottom
swab
and
Stoddard
solvent
or
(18803297
& ON.)
equivalent,
gently lift edges
of rubber
umbrella (5)
and clean stainless steel seat and umbrella removing 12-23. DESCRIPTION. Both fuel filler caps incor-
all
contaminates. Using a second
swab wipe seat and porate
a vent and safety valve that
provides both
umbrella
thoroughly, removing all
cotton fibers. vacuum
and positive pressure
relief.
Repeat
until swabs
show no discoloration.
b. If O-ring
or outer seal
grooves appear
contami-
12-34. INSPECTION,
CLEANING
AND REPAIR.
nated, clean with Stoddard solvent or equivalent and a. Remove the fuel filler cap from the adapter
cotton swabs.
assembly.
c. Ascertain
that all vent holes in check
valve are b. Disconnect
the safety chain from the
cap and
unobstructed.
cover
or plug the tank opening to keep
out foreign
d. Clean cap body
and lock plate,
check for defects.
matter.
e.
If the
umbrella
continues
to
leak or
is deterio-
c.
Check
condition
of gasket
and
frictionless
rated it must
be replaced.
washer,
replace as required.
f. To
remove umbrella,
lubricate
the
umbrella
d. Using
cotton
swabs and
Stoddard
solvent or
stem with
(MIL-H-5606)
hydraulic
fluid
to prevent
equivalent,
gently
lift edges
of rubber
umbrella
and
tearing
the
stem.
clean
seat
and umbrella
removing
all contaminates.
g.
To replace
umbrella,
lubricate
the umbrella
Using a
second
swab wipe
seat
and umbrella
thorough-
stem
with
(MIL-H-5606)
hydraulic
fluid
and use
a
ty,
removing
all cotton
fibers.
Repeat
until
swabs
small blunt
tool to insert
the retaining
knob
on the
show
no discoloration.
umbrella
stem
into
the check
valve
body to
prevent
e. If
the umbrella
continues
to leak
or is deterio-
damaging
the
stem.
rated,
remove
and
replace.
To remove
the umbrella,
lubricate
the umbrella
stem with
(MIL-H-5606)
hy-
12-31.
REASSEMBLY.
draulic
fluid to prevent
tearing
the stem.
When
in-
stalling
the new umbrella,
lubricate
the stem
with
NOTE
(MIL-H-5606)
hydraulic fluid
and use
a small blunt
tool to insert the retaining knob on the umbrella,
If
fuel was
observed
leaking
around
the
cap
into the
check
valve
body.
periphery
prior to disassembly
and
the leak-
f. Connect
fuel cap
to safety chain
and reinstall
age
was not
due to a
bad O-ring
or
outer seal
cap
in the adapter
assembly.
an
additional
split
washer
(16) may
be
added
for a total of two, prior to
reassemblying cap. 12-35.
FUEL QUANTITY TRANSMITTERS.
Fuel
To make sure that these washers are not in- quantity transmitters are installed in the top of fuel
stalled upside down, check to see that edges tanks an/or cells. A complete description, along
of the split parallel the respective
sides of with
procedures for removal,
installation and ad-
the cap well. The addition of a washer under justment are contained in Section 15.
the cap handle
will increase
the effort
required
to uncap
the fuel
tank.
to
uncap
the
fuel
tank.
12-36.
FUEL
RESERVOIR
(RUBBERIZED
CELL
a. Install spring (15) on stem (14). INSTALLATION).
b. Install
fuel
cap body
(2)
on stem
(14).
c. Check that three metal plates (12) on top rim of 12-37. DESCRIPTION. A fuel reservoir is installed
lock plate (6) are aligned with
three guide bosses on in
the lower fuselage immediately
forward of the con-
fuel cap
body (2).
trol stick.
The reservoir
has
six fuel
line connec-
tions:
two from the
right fuel cell.
two from the
left
fuel cell,
one to the shut-off
valve and
a vapor return
line
from the engine.
A drain valve
with strainer
is
It is
possible to install the handle
pin in the installed
in the bottom of the reservoirfor
draining
pin hole 180- out of the desired position, If trapped water and sediment from the fuel system.
the
alignment
procedure
in step "c"
is not
followed.
If the handle (1) is not installed
12-38. REMOVAL
AND INSTALLATION (See
figure
properly the FWD arrow
on the cap will not
12-2. Sheets
3 and 4).
align
with the
arrow on
the placard
(9)
when
the
cap
is reinstalled.
d. Compress
cap body
(2)
and lock
plate
(6), install
Refer
to
page vi
prior to
fuel system
com-
split washer(s)
(16) as
required.
ponent
maintenance.
e. Install
cap handle
(1) on stem
(14) so that the
handle
(1) will be in the open position.
a Remove
plate immediately aft of hopper
on lower
f. Insert handle pin (17) through handle (1) and fuselage skin.
stem (14)
b Drain all fuel
from cells at sump drain plugs.
g. Connect fuel cap assembly
to safety chain (10)
Drain fuel from reservoir
and lines with strainer
and reinstall
fuel
cap Make
certain that
the arrow
drain
control.
To expediate
draining
of fuel,
remove
on the fuel
cap body (2) and the arrow on
the placard drain valve
from bottom of reservoir.
(9) align. c. Disconnect fuel lines at reservoir.
12-20 Revision 1