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the test components
as shown
in Figure
5-15.
of a
reddish
pink stain on the cloth to indicate the presence
of a
leak.
Encircle
the area on the
fuel
cell beneath
such
g.
Make
up
a solution
of phenolphthalein
as
stains
with
a chalk mark to pinpoint
the
locations
of leaks.
follows:
Add 1/3 ounce phenolphthalein
crystals to 1/2 gallon
ethyl alcohol,
mix, then add 1/2 gallon
water.
NOTE
h.
Make up an ammonia
solution
by
adding 100
cc
(3 fluid
ounces)
of concentrated
ammonium
hydroxide
Continued
use of the testing cloth
will require
(NH4OH)
per gallon of
water.
repeated
saturations
with
phenolphthalein
since
rapid evaporation
of the alcohol
from
the cloth
2.
Place the
fuel
cell and test equipment
on a clean
progressively
reduces
the sensitivity
of the test
work
bench.
unless
the solution
in the cloth
is frequently
renewed.
CAUT/ON
REPAIR
OF
UNIROYAL
RUBBER
FUEL
CELLS,
OUTSIDE
Make
sure
the
work
area
is
clean of metal
shavings
or
other
debris that could
damage
the
a.
Cut
a
rounded
patch of Uniroyal
5200 outside
repair
fuel
cell.
material
large
enough
to
cover the damage at
least
2
inches
from the cut in any direction.
The
patch should be thinned
toward the edges.
3.
Install
the closure
plates
over
the
fuel
cell
openings
and torque the retaining
screws as specified
in
the
b.
Buff the
base
of the patch and the
damaged
area to be
installation
section of the shop manual
for
the openings,
then
covered
by the patch
lightly
and thoroughly.
Wash off the
insert
the rubber stoppers
into
the open
fittings.
buffing dust
with
methyl ethyl ketone.
4.
The
flask
(or
bottle)
containing
the
ammonium
c.
Coat
the
base
of the patch and the damaged
area
with
hydroxide
solution
should
be
1/3 to 1/2
full
as shown
in
the
EC-678
cement and allow it to dry
for
10 to 15 minutes.
Next
illustration,
apply a second
coat of
EC-678
cement
to the base of the
patch
and the damaged
area and allow it to dry 10 to 15
5.
Connect
a shop air supply to the regulator
and
minutes.
interconnect
the
regulator,
beakers,
fuel
cell,
and
manometer
as indicated
in
Figure
5-15.
d.
Reactivate
these two surfaces
by
moistening
them
with
a piece of cheesecloth
dampened
in
methyl ethyl ketone.
6.
Inflate
the fuel
cell to 1/4 psi with a mixture of
Place the patch on the damaged
area
when
the surfaces
are
shop air and ammonium
gas. A 6-inch
difference
in the two
tacky making contact
first
at
the
center of
the
patch. Then
water
levels of the
manometer
will
indicate that the
fuel cell
roll
the
patch outward
from
the
center by hand.
Next
apply
is
inflated
to 1/4 psi. It
is
not necessary
to restrain
the cell
pressure
to the repair
with
a 1/4
inch
roller
beginning
at the
other than to
keep
it
from
rolling off the
bench.
The
filling
of
center and
working
to the outside edge in order to prevent
air
the cell
will
be
rather slow at
the
1/4 psi,
but
should not
be
or solvent pockets
between
the patch and the cell.
rushed as overpressure
of the cell could result.
e.
Cover
the patch with a sheet of polyethylene
and lay
a
7.
Saturate
a
large,
clean
cloth
with
50 pound shot
bag
over
the
repair. After six hours
remove
phenolphthalein.
(Immerse
it
in
a
container
and squeeze out
the weight and polyethylene
sheet.
excess
liquid.)
f.
Seal
coat the edge of
the
patch 1/2
inch
on each
side
of
edge with
EC-678
and allow it to
dry thoroughly for
at least
CAU770N
six hours.
Wear rubber
gloves
to protect
against
skin
REPAIR
OF UNIROYAL
RUBBER
FUEL
CELLS,
irritation
when
handling
the
cloth.
As
a further
INSIDE
protection
against
possible
penetration
of
the
phenolphthalein
solution
through
the gloves,
a.
Allow 6
hours to
elapse after completion
of the outside
wash
your
hands
thoroughly
after
finishing
the
patch
before beginning
repair of
the inside
of the cell.
test.
b.
Repair procedure
for inside
of
cell
is
the
same as the
outside except
Uniroyal
5200/5187
inside
patching material is
8.
Lay
the cloth over the various portions
of the
used. Wipe a
light coat of light engine
oil on the patched
fuel
cell until the
entire
exterior of the cell
has been
covered.
area, to prevent
it from
sticking to other areas of the cell. on
With each application
of
the cloth,
watch
for
the
formation
installation.
5-22
C3
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Table of Contents
Troubleshooting
