PIPER
COMANCHE
SERVICE
MANUAL
7C·57. Jlalo¥III
Of
S-
a. DiscolllleCt
the
clamps
that
oecure
the
wires
to
the
.,.me
&ad
&cceslDria.
b.
LDOKD
the
coup!int
aua
at
the
spuk
plup
aDd
_
the
iasWaron from
the
sparl<
plUI barrel
welL Ule
cautioa
"beD
widlcinwinl
the
iDJDI&tor
DOt
to
damose
the iasWaror
SPriDl.
c.
Place.
pard
~
the
IwDesI iDlWaror.
d. Remove the IwDesI
aucmbly
tcnniDaI platc from the 1IIII"ftO.
e. Remove
the
......
baffle platc that receifts
the
bamea
aaembly.
f. Remove
the
harDca from the airplane.
7C·'8.
1
...
I"do.
Of
a.....
Before
iamlliDi
bamea
aD
.......
ftO.
c:heck
matiag surfaces for
cIroali",."
Spray entire face
of
gromlllC't with •
1iBbt
COat
of
Plutie
Mo1cl
Spray.
SM~~·TH
Silicoae Spray or
equivoleat. This will preveat
bam
...
grommet from
stic:kial
to
IIIII"ftO
dilaibutor
b1oc:k.
a. Place the barn
...
tcrmiJIai plate
oa
the
.......
etO
&ad
tighteD
aua
around the plate alternately to
....
caver squarely
"a
1DIfDOtD.
Torque
screws
to 18
to
ZZ
inch pouads.
b. Route
ipition
wira
to their respective cy' len.
e. Clamp the
bam
...
auembly
in position
&ad
replace the engille baffle plate.
d.
CODDect
rbe leads
to
the
sparl<
plup.
7C·'9.
Span.
Pi
.....
7C-OO.
Removol
Of
Spork PIlIp.
a. Loosen the
cOllpq
alit
oa
the
bam
...
lead and remove
the
terminal insulator from the
sparl<
plug
barrel
well.
NOTE
When withcinwing the ignition cable lead connection from the plug.
cate
must be
talc.en
to
pu.l.l
the lead straicht
out
and in line with the
center
line
of
the plug barrel; otherwioe. a side load will be applied
w,ich
frequendy resI1Ia in
damace
to the barTel
insIlI&cor
&ad
conneceor. If
tbe
lead
canaot
be removed easily
in
tIIis manner. the
resistiaJ
coatact
betw
..
n the neoprene
coUu
and the barrel
insIlI&tor
will
be
broken
by
a rotary twisting
of
the coUu. Avoid
IlDdue
distortion
of
the coUar and poaible side loading
of
the bartel insulator.
b.
Remove the
spark
plug from the engine. In the
coune
of
engine operation. carbon and other
combustion
prodllca
will be deposited
on
the
eDd
of
the spark plllg and will penetrate the lower threads
to
some degree. A
••
result. greater torque
is
freqllendy required for retnoving a plug
than
for
iu
in.uIIanon.
Accordingly. the torque limitations given
do
not
apply to plug retnovol and
",fficent
torque mll$t be
....
d
to
unscrew the plug. The higher torque in removal is
not
as
detrimental
as
ir.
insLillation, since it cannot
stretch the threaded section.
It
don.
however. impose
a.
sheanng load on this section and
ma.y.
If
sufficiently severe, produce
a.
failure
IJl
this location.
POWER
PLANT
ISSUED:
8118n2
2
H18
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