Piper Cherokee Six - Page 388

NOTE
234
Spark
plugs
should
not be
installed
if
they
have
been
dropped.
d. Removal of seized spark plugs in
the cylinder may
be accomplished
by
application of
liquid carbon dioxide
by
a
Conical
metal
funnel
adapter
with
a
hole at
the apex just large
enough to
accommodate
the funnel of a CO
2
bot-
tle. (Refer to Figure 7-12.) When a
seized
spark plug
cannot
be removed
by
normal
means,
the funnel
adapter
is
placed over
and around the
spark plug.
Place the funnel
of the CO
2
bottle
inside Figure
7-12. Removing
Spark Plug
the funnel
adapter
and
release
the
car-
Frozen
to Bushing
bon dioxide
to
chill and
contract
the spark
plug.
Break
the spark
plug loose
with
a wrench.
A warm cylinder
head
at the time
the carbon
dioxide
is applied will
aid
in the
removal
of
an excessively
seized
plug.
e. Do
not allow
foreign
objects
to enter
the spark
plug
hole.
7-30. INSPECTION
AND CLEANING
OF SPARK PLUG.
a. Visually
inspect
each spark
plug for the
following
non-repairable
defects:
1. Severely
damaged
shell or shield
threads nicked
up, stripped or
cross-
threaded.
2. Badly
battered
or round
shell hexagons.
3. Out-of-round
or damaged
shielding
barrel.
4. Chipped,
cracked
or
broken
ceramic
insulator
portions.
5.
Badly eroded
electrodes
worn
to approximately
50%
of original
size.
b.
Clean the spark
plug; removing
carbon
and foreign
deposits.
c.
Test the
spark plug
both
electrically
and
for resistance.
d.
Set the
electrode
gap
at
0.017 to
0.021
inch.
7-31.
INSTALLATION
OF SPARK
PLUGS. Before
installing spark
plugs, as-
certain
that the threads
within
the cylinder
are
clean and
not damaged.
a. Apply
anti-seize
compound
sparingly
on the
threads,
install gasket
and
spark
plugs. Torque 360
to 420 inch pounds.
POWER PLANT
Revised: 11/4/83
PIPER
CHEROKEE SIX
SERVICE MANUAL
2F16