Piper Cherokee Six - Page 426

PIPER CHEROKEE SIX SERVICE MANUAL
7A-31.
HARNESS
ASSEMBLY.
7A-32.
INSPECTION
OF HARNESS.
a.
Check
lead assemblies
for nicks,
cuts,
mutilated
braiding,
badly worn
section
or any
other
evidence
of physical
damage.
Inspect
spark
plug
sleeves
for
chafing
or tears
and damaged
or
stripped
threads
on coupling
nuts.
Check
compression
spring
to see
if it is
broken
or distorted.
Inspect
grommet
for
tears.
Check all
mounting
brackets
and clamps
to
see that
they are
secure
and
not cracked.
b.
Using an
ohmmeter,
buzzer,
or other suitable
low
voltage device,
check
each lead for
continuity.
If continuity
does not
exist, wire
is broken
and must
be
replaced.
c. For electrical
test
of harness
assembly,
use a
high voltage,
direct cur-
rent tester
such as the
TAKK Model 86
or 86A or an equivalent
direct
current
high voltage
tester
capable of
delivering
a test potential
of 10,
000 volts.
Con-
nect
ground lead
of high voltage
tester
to outer
shielding braid
of a single
lead.
Connect
plug terminal.
Turn
tester "ON"
and apply
10,000 volts.
The insulation
resistance
should be
100 megohms
minimum.
Proceed
to check
other leads
of
harness
in same
manner.
d. Minor
repair
of the
harness
assembly,
such
as
replacement
of
contact
springs,
spring
retainer
assemblies,
insulating
sleeves
or of
one lead
assem-
bly,
can be accomplished
with the harness
assembly
mounted on the engine.
How -
ever,
should repair require
replacement
of more than
one lead assembly
or of
a
cable outlet
plate, the
harness should
be removed
from
the engine
and sent to
an overhaul
shop.
7A-33. REMOVAL OF HARNESS.
a. Disconnect the clamps
that secure the wires to the
engine and accesso-
ries.
b.
Loosen the coupling
nuts at the
spark plugs and
remove the insulators
from
the spark
plug barrel well.
Use caution
when withdrawing
the insulator not
to
damage the insulator spring.
c.
Place a
guard over
the harness
insulators.
d. Remove
the harness
assembly
terminal
plate
from the
magneto.
e. Remove the harness from the airplane.
POWER PLANT
Issued: 8/17/72
2H6