Piper Cherokee Six - Page 445

813
Figure
7A42.
Checking
Impulse
Coupling
Figure
7A-43.
Orientation
of
Spring
for
Magnetization
in
Coupling
Body
7A-43.
IMPULSE
COUPLING
INSTALLATION.
a.
Check
mating
cam
assembly
and
body
for
magnetization
which
would
prevent
flyweights
from
engaging.
Hold
the
assembly
as
shown
in
Figure
7A-42
and
push
upper
flyweight
against
body.
When
released,
flyweight
must
drop
down.
If
flyweight
sticks
to
body,
parts
are
magnetized
and
coupling
may
not
function.
Perform
test
on
both
flyweights.
b.
To
demagnetize,
place
body
over
shaft
of
a
charged
rotating
magnet
and
spin
body
rapidly
by
hand.
While
body
is
still
spinning,
invert
magnet
so
body
falls
off.
Catch
body
in
hand
and
repeat
test
for
magnetization.
c.
Clamp
one
drive
lug
of
the
body
in
a
padded
jaw
vise
with
the
spring
recess
side
up.
d.
Orient
the
spring
with
the
body
for
correct
rotation.
On
clockwise
couplings,
the
spring
must
coil
in
a
clockwise
direction
from
the
outside
toward
the
center
when
viewed
from
the
spring
recess
side
of
the
body.
(Refer
to
Figure
7A-43.)
Insert
eye
of
outer
end
of
spring
into
hole
drilled
in
inner
rim
of
body.
e.
Using
heavy
gloves
to
protect
the
hands,
wind
spring
into
body
manually,
lifting
spring
coils
one
at
a
time
over
projections
on
body.
Extreme
care
should
be
used
to
avoid
scratching
or
nicking
the
spring.
After
winding
the
spring,
brush
a
coating
of
light
oil
over
the
spring
coils.
f.
Pry
up
one
and
one-half
turns
at
the
inner
end
of
the
spring
with
a
small
screwdriver
and
support
in
position
as
shown
in
Figure
7A-44.
g.
Engage
recess
in
the
hub
on
the
cam
assembly
with
eye
at
inner
end
of
spring.
With
eye
engaged,
rotate
cam
assembly
slightly
in
direction
to
unwind
spring
to
permit
hub
of
cam
to
slip
into
the
inner
turn
of
the
spring.
Rotate
the
cam
in
the
opposite
direction,
winding
spring
slightly,
until
projections
on
edge
of
cam
clear
over
the
projections
on
the
body.
Push
the
cam
assembly
down
into
the
body,
at
the
same
time
taking
the
screwdriver
out.
POWER
PLANT
Added:
7/28/75
PIPER
CHEROKEE
SIX
SERVICE
MANUAL
211