Table of Contents
Advertisement
MODEL 182 & T182 SERIES SERVICE MANUAL
12-17.
RED PLASTIC "FLUSH-TYPE" FILLER
washer under the cap handle will increase
CAPS.
A red plastic "Flush-Type" vented filler cap
te
effort required to upcap the fuel tank.
may be used.
Extra care is required when reinstall-
ing plastic filler caps in the fuel filler adapter assem-
a. Install spring (15) on stem (14).
bly.
An improperly installed filler cap could cause
b. Install fuel cap body (2) on stem (14).
a loss of fuel from the tanks during flight.
c.
Check that three metal plates (12) on top rim of
lock plate (6) are aligned with three guide bosses on
12-18.
INSPECTION.
fuel cap body (2).
NOTE
If fuel collects in the handle well it could in-
It is possible to install the handle pin in the
dicate stem O-ring leakage.
Fuel collecting
pin hole 180° out of the desired position, if
around perimeter of cap could indicate cap
the alignment procedure in step "c" is not
outer seal or check valve leakage.
followed.
If the handle (1) is not installed
properly the FWD arrow on the cap will not
a.
Remove fuel cap from adapter (8), remove safe-
align with the arrow on the placard (9) when
ty chain (10) from cap and cover or plug fuel opening
the cap is reinstalled.
to keep out foreign matter.
b.
Rotate cap handle (1) to the "OPEN" position,
d.
Compress cap body (2) and lock plate (6), install
compress cap body (2) and lock plate (6) to expose
split washer(s) (16) as required.
the .125 inch diameter handle pin (17).
e.
Install cap handle (1) on stem (14) so that the
c.
Using a small wire push out the handle pin (17).
handle (1) will be in the open position.
d.
Note resilience of O-ring (13) and outer seal (3)
f.
Insert handle pin (17) through handle (1) and
and condition of grooves.
If the O-ring (13) or the
stem (14).
outer seal (3) have deteriorated they must be replaced.
g.
Connect fuel cap assembly to safety chain (10)
e.
Note condition of tabs on lock plate (6) for signs
and reinstall fuel cap.
Make certain that the arrow
of abnormal wear, if such wear is evident replace
on the fuel cap body (2) and the arrow on the placard
the complete cap assembly.
(9) align.
12-19.
CLEANING.
12-20A.
LEAK TESTING METAL OR RED PLASTIC
a.
Using a cotton swab and Stoddard solvent or
FILLER CAPS.
equivalent, gently lift edges of rubber umbrella (5)
and clean stainless steel seat and umbrella removing
The following procedure may be used to detect fuel
all contaminates.
Using a second swab wipe seat and
filler cap leakage.
umbrella thoroughly, removing all cotton fibers.
a.
Service the aircraft with approved fuel filling
Repeat until swabs show no discoloration.
each bay.
b. If O-ring or outer seal grooves appear contami-
b.
Place the fuel selector in the OFF position.
nated. clean with Stoddard solvent or equivalent and
c.
Plug one of the fuel bay vent lines (where it
cotton swabs.
protrudes beneath the wing) with a small rubber
c.
Ascertain that all vent holes in check valve are
plug or tape.
unobstructed.
d.
Connect a rubber hose to the other vent.
Then
d.
Clean cap body and lock plate. check for defects.
tee into this hose a pressure measuring device, such
e. If the umbrella continues to leak or is deterio-
as a water manometer, manifold pressure gage or
rated it must be replaced.
airspeed indicator.
f.
To remove umbrella, lubricate the umbrella
e.
Blow into the open end of the hose.
The pressure
stem with (MIL-H-5606) hydraulic fluid to prevent
must not exceed .7 psi which equals 20 inches of water
tearing the stem.
on a water manometer, or 1. 43 inches Hg on a mani-
g.
To replace umbrella. lubricate the umbrella
fold pressure gage, or 174 Kts on an airspeed indica-
stem with (MIL-H-5606) hydraulic fluid and use a
tor.
small blunt tool to insert the retaining knob on the
umbrella stem into the check valve body to prevent
damaging the stem.
Do not inhale fuel vapor while blowing into
12-20.
REASSEMBLY.
the rubber hose.
NOTE
f.
It may take several applications of pressure to
to bring the bay to the desired pressure level.
If fuel was observed leaking around the cap
periphery prior to disassembly and the leak-
age was not due to a bad O-ring or outer seal
an additional split washer (16) may be added
Do not apply regulated or unregulated air
for a total of two, prior to reassemblying
pressure from an air compressor to the
cap.
To make sure that these washers are
fuelvent.
Over inflation and major struc-
not installed upside down, check to see that
tural damage will occur if more than .7
edges of the split parallel the respective
psi is applied.
sides of the cap well.
The addition of a
12-15
Advertisement
Table of Contents
Troubleshooting
