Piper Cherokee Six - Page 432

PIPER
CHEROKEE
SIX SERVICE
MANUAL
NOTE
If the
crimping
tool
is not
available,
a satisfactory
connection
can be
made
by
soldering
with
Kester
Flux
709
or
equivalent
and
a non-corrosive
solder.
After
soldering,
clean
solder
joints
using
denatured
alcohol.
16. Install
clamps
and cable
ties
as necessary
to secure
lead to
the engine.
7A-35.
INSTALLATION
OF HARNESS.
Before
installing
harness
on magneto,
check
mating
surfaces
for cleanliness.
Spray
entire
face
of
grommet
with
a
light
coat
of Plastic
Mold
Spray,
SM-O-O-TH
Silicon
Spray
or
equivalent.
This
will
prevent
harness
grommet
from
sticking
to magneto
distributor
block.
a.
Place
the
harness
terminal
plate
on
the
magneto
and
tighten
nuts
around
the plate
alternately
to
seat
cover
squarely
on
magneto.
Torque
nuts
to
18 to
22 inch-pounds.
b.
Route
ignition
wires
to their
respective
cylinders.
c.
Clamp
the
harness
assembly
in position.
d.
Connect
the
leads
to
the spark
plugs.
7A-36.
MAGNETO
(D-2000
SERIES).
7A-37.
DESCRIPTION
AND
PRINCIPLE
OF
OPERATION.
The D-2031
magnetos
feature
two
electrically
independent
ignition
circuits
in one
housing.
A
single
four
pole
rotor
provides
the magnetic
energy
for both
circuits.
This
magneto
uses
an impulse
coupling
to
provide
reliable
ignition
at
engine
cranking
speed.
A
single
cam
operates
the
main
breakers
for
both
magneto
circuits.
Suppression
of
contact
point
arching
and
conducted
radio
interference
is accomplished
by feed-thru
capacitors
which
are mounted
in the
magneto
cover
which
forms
a
part
of the
magneto
harness
assembly.
At
low engine
cranking
speeds
the
impulse
coupling
automatically
retards
the
magneto
until
the engine
is also
at its
retard
firing
position.
The
spring
action
of the
impulse
coupling
is
then released
to spin
the
rotating
magnet
and
produce
the
spark
required
to
fire
the engine.
After
the
engine
starts,
the
impulse
coupling
flyweights
do
not
engage
due
to centrifugal
action.
The
coupling
than
acts as
a straight
drive
and
the magneto
fires
at
the normal
firing
position
of the
engine.
7A-38.
INSPECTION
OF MAGNETO.
After
the
first
50 hour
period
and
every
100
hours
thereafter,
the
magneto
ignition
system
should
be checked.
If
engine
operating
troubles
develop
which
appear
to
be caused
by
the ignition
system,
it is
advisable
to
check
the spark
plugs
and
wiring
first
before
working
on the
magneto.
Should
trouble
appear
definitely
associated
with
the
magneto,
the
most
effective
measure
is to
install
a
replacement
magneto
which
is
known
to
be in
satisfactory
condition
and
send
the
suspected
unit
to
the overhaul
shop
for
test and
repair.
Should
this
not
be possible,
a visual
inspection
of the
following
items
may disclose
the
source of
trouble.
POWER
PLANT
Revised:
7/28/75
2H12