PIPER
COMANCHE
SERVICE
MANUAL
the timing
is
cornet,
both
timinI
llg/Its will
be
out.
If
the breaker poiDts
open
'00
IOOD,
loosen
'he
mapetO
mounting nuts, and
roa.
..
the
mape,o
iD
a
<loc:kwise
directioD (riIb'
mapeto).
The
left
mape,o
should also
be
rou,ed
iD
a
clockwix
olireotion.
If
points
open
'00
Ia,e, •
tum
both
mapeto.
in a
countercloclcwiK cliteotiOD. When i, is c:eruiD both magneto. an:
let
to
rift
,.,..mer,
remove
timinlligh,
and replaoe PIU,..
CAUTION
When
timinJ
mard
breaker
mll"eros
'0
the
engine,
only
maiD
breaker
poiDts
""
timed. Never
manp'
to
time
mard
breaker poiDts
'0
the
eneine.
71-43.
Hamal
AJoembly.
71-14. l!llpCcUoD
Of
Hamcu,
a, Check lead uscmblies for niclcs, <uts, mutila,ed braiclini, badly worn
....
ion or any other evidence
of
physical damage. lasp
...
spark plug .Ieev
..
for chafing
or
tears
and damaged
or
.tripped
thread.
on
coupling nuts. Checlc compression spring
to
..
e
if
i,
is
brokeD
or
dis,orted. Inspe
..
gromme, for ,ears.
Check all
mounting
brackets and clamps
to
...
that
they are
..
cure and
no,
cracked.
b.
Using
an ohmmerer, buzzer,
or
other
Nitable low
VOltage
devie<, checlc each lead for continuity
If
continuity does
not
exist. wire
is
broken and must be replaced.
c.
MiDor
repair
of
the
harness
....
mbly,
Ncb
as replaeemen,
of
concact
sprinp,
.pring retainer
....
mbli
..
,
in.ula'ing
sleeves
or of
one
lead
....
mbly,
can
be
accompliahed
with
the harness
....
mbiy
mounted
on
the
engine. HoweveT. should repair require replacement
of
more
than
onc
lead assembly or
of
a
cable
outlet
?Iate,
'he
ham
...
should
be
removed from the engine and
..
n'
'0
an overhaul
.hop
7845.
Removal
Of
Ham
...
,
a..
Disconnect the clamps
cha.e
seaate the wires
to
the
engine and accessories.
b.
Loosen
the
coupling nuts
at
the
spark plugs and remove the irlsulaton from the spark plug barrel
well.
Use
caution when withdrawing
the
insulator not to damq:e
the
insulator spring.
c.
Place a guard oyer
the
harness inJulaton.
d..
Remove
the
harness assembly tenninal place from the magneto.
e.
Remove che engIne baffle plate that
receiYes
the harness assembly.
f. Remove
the
h.arness from
the
airplane.
7B46.
InJaUadon
Of
Harness. Before installing harness
on
l'T1.I.!l1eto.
check maring surfaces for cleanliness.
Spray
entire face of grommet with a light coat
of
Plastic .\told Spray. SM.Q.Q-TH Silicone Spray or
equi\·alent. This
Will
prevent harness grommet from sticking to magneto
distributor
block.
a.
Ptace
the
harness termUlal plate on the magneto and tighten nuts around the plate :llternately to
scat
cover squarely on magneto. Torque
sc:rews
to 18
to
22 inch pounds.
b Route ignition
wires to their respective
~ylindcn.
c.
Clamp the harness assembly
in
position and replace the engIne baffle plate.
d.
Connect
'he
leads to the spark plugs.
POWER
PLANT
ISSUED:
8/18172
2
F19
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