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SPARK PLUG
ELECTRICAL SYSTEM
IGNITION TIMING
Note:
Remove
all
dirt
from
the
base
of the
spark
plug
before
removing
the
spark
plug.
Remove
the spark
plug
after every
i00
hours of operation for
cleaning and checking
the gap. See lllust. 15.When
making
this adjust-
ment,
always
bend
the outer electrode.
Never
bend the center electrode,
as it may
damage
the insulator. If the gap between
the electrodes
is too great, the engine will misfire
and be
hard to start.
Always
use
a spark
plug
wrench
when
re-
moving
or
reinstalling
the
plug.
Be
sure
the
gasket
is
in good
condition,
and
screw
the plug
in tightly.
Do not
tighten
more
than
enough
to compress
the
gasket
to
seal
the
plug
and
assure
a good
heat
transfer
between
the
plug
and
the
cylinder
head.
Tighten
the
plug
1/Z
to
3/4
turns
past
finger
tight.
Illust.
15
Checking the spark plug gap.
Set gap at .025-inch.
Replace
a defective
plug
with
a new
plug.
See
your
International
Harvester
dealer
for
a
correct
replacement
plug.
Cleaning the Spark Plug
Sandblasting
is
the
recommended
method
of
cleaning
the
spark
plug.
Never
scrape
or
clean
the
insulator
with
anything
which
will
scratch
the
porcelain.
Scratched
porcelain
allows
carbon
and
dirt
to
accumulate
much
faster.
15
Illust.
15A
Adjusting
the breaker
points.
Set gap at .020-inch.
Remove
the
breaker
point
cover
after
every
100 hours
of operation
for
cleaning
the
points
and
resetting
the
gap
(illust.
15A). Replace
badly
pitted
or
burned
points.
For
more
precise
timing,
a timing light
should
be used.
The
engine
has
a timing
sight
hole
which
is located
in the
right
side
of the
engine
bearing
plate
on the
International
Cub
Cadet
71 Tractor
or
in the
right
side
of the
blower
housing
in the
International
Cub
Cadet
10Z,
lZZ
and
lZ3
Tractors.
Seelllusto15B.
With
the
engine
running
at
1/3
throttle,
or
more,
adjust
the
breaker
points
until
the
"SP"
mark
on the
flywheel
is centered
in the
sight
hole.
Note:
The
"SP"
mark
will
appear
Z0
degrees
before
top
dead
center.
The
other
mark
is the
top
center
mark
and
is
stamped
with
"DC"
below
the
mark.
Illust.
15B
location
of timing
sight
hole.
(Motor-generator
has been
removed
to better
illustrate
the location).
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