PIPER
COMANCHE
SERVICE
MANUAL
e. If it was possible to eleetrically discoMect the
starter
from the starter solenoid, the starting
vibracor may be
merpzed
by turning
the
starter switcb on.
f.
If
starter was
not
electrically removed from starter solenoid, it is necessary to
~OD.D.ect
& jumper
lead from starter switcb ,ermin&l
on
vibrator
'0
ungrounded termi.aal
OD
battery. Tbis will enerpze
the
Hartinl
vibrator.
c. Holding the number one
cylinder
spark plug lead .pproximately
3/16
to
1/4
incb
.way
from.
good ground, • seri
..
of
hot
sparks should occur.
sho
I.
CAUTION
Grup
the spark plug lead far enough
.way
from the
coMection
so
as
Dot
to
produce
&Dy
dangerous eleetrical shock.
If
'he
spark does
not
jump the gap, cbeck the applied voltage
'0
the starting vibrator. This voltage
Dc
.ithor 12 or
24
vola
ckpcnding upon
'he
system being checked.
If
voltage
is
correct, check
thc
contact
poinu
of
thc magncto.
80th
sea
of
contact
p"ina
shall be
opcned.
j.
Reject all
unia
not complying with the preceding requirements
or
which show
Uly
visual defccu.
7848.
Spark Plugs.
7849.
Removal
Of
S ..... k Plugs.
a.
Loosen the coupling nut on the harness lead and remove the terminal Jnsuator from the spark plug
barrel well.
NOTE
When withdraWing
the
ignition cable lead connection from
the
plug.
cue
must
be
taken to pull the lead stn.ight
out
and in line with the
center
line of the plug barre" otherwise, • side load will be
.pplied
which.
frequently results in damage to the barrel insulator and
connector.
If
the
lead c:annot be removed easily in this manner. the
resisting
contact
between
the neoprene coUar and
the
barrel insulator
will be broken
by
a
rotuy
tw}5cng
of
the
coUat.
AVOid
undue
distortion
of
the
collat
and
possible side loading
of
the
banei
insulator.
b.
Remove
the
spark plug
from
the
engine. In the course
of
engine operation.
carbon
~nd
other
combustion
pro-jucts wtll be
deposited
on
the
end
of
the spark plug
iIlld
will penc.tn.te the lower thre3.ds
to
some degree. As
~
result. greater
torque
is
frequendy
required for removmg a plug
than
for Its inst.illanon.
Accordingly.
the
torque
limJutions
given do
not
apply to plug removal
and
suffiCient torque must be used
to
unscrew the plug.
The
hIgher
torque
In
removal
IS
not
as
detrimental
as
In
mstillation.
Since it
cannot
stretch
the
threaded
section.
It
d~.
howc:ve:-,
impose a
shewg
load
on
thiS section
and
may.
If
sufficiently severe, produce a failure in chis locanon.
POWER
PLANT
ISSUED:
8/18172
2
F21
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