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ELECTRICAL SYSTEM
IGNITION TIMING
LIGHTING SWITCH BUTTON
Pull the button
(1IIust. 20A) out to turn on the
lights
and push it in to turn
off the lights.
CIGARETTE LIGHTER
Push
the lighter
to make
electrical
contact.
When
it pops
back
it is
ready
for use.
SPARK PLUG
Hote: Remove all dirt from the base of the
spark plug before removing the spark plug.
Remove the spark ~lug after every 100
hours of operation for cleaning and checking
the gap. See IJlust. 18. 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
1/2 to 3/4 turns
past finger
tight.
Illust.18A
Adjusting
the breaker points.
Set gap at .O20.inch.
Cleaning the Spark Plug
Sandblasting
is the recommended
method
of
cleaning
the spark plug.
Never
scrape
or clean
the insulator
with anything
which wiU
scratch
the porcelain.
Scratched
porcelain
allows
carbon
and dirt to accumulate
much faster.
Remove
the breaker
point
cover
after
every
100 hours
of operation
for cleaning
the points
and resetting
the gap (1IIust. 18A). Replace
badly
pitted
or burned
points.
For more
precise
timing,
a timing
light
I
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 72 Tractor
or in the right
side of the
blower
housing
in the International
Cub Cadet
104,
lOS, 124 and 125 Tractors.
See "lust. 18B.
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.
Nate: The "SP"
mark
will
appear
20 de-
grees
before
top dead center.
The other
mark
is the top center
mark
and is stamped
with
"DC " below the mark.
Illust.
18
Checking
the spark plug gap.
Set gap at .O25-inch.
Illust.
18B
Location
of timing
sight hole.
(Motor-generator
has been removed to better
illustrate
the location).
Replace a defective plug with a new plug.
See your International
Harvester
dealer for a
correct
replacement
plug.
18
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