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ELECTRICAL SYSTEM
SPARK PLUG
IGNITION TIMING
Note: Remove
all dirt
from
the base of the
spark plug before
removing
the spark plug.
Remove
the spark plug after
every
100
hours
of operation
for cleaning
and checking
the gap. See Illust. 15. When making
this adjust-
ment,
always
bend the outer
electrode.
Never
bend the center
electrode,
as it may damag:!
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.
Illust.15A
Adjusting
the breaker paints.
Set gap at .O20-inch.
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.
Remove
the breaker
point
cover
after
every
100 hours
of operation
for cleaning
the points
and resetting
the gap (1IIust.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
s ide 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
102, 122 and 123 Tractors.
See Illust.15B.
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 "Spl'
mark
will
appear
20degrees
before
top dead center.
The other
mark
is the top center
mark
and is stamped
with
"DC'I
below the mark.
(Ilust.
15
Checking
the spark plug gap.
Set gap at .O25-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.
Illust.
158
Location
of timing
sight hole.
(Motor-generotor
has been removed to better
illustrate
the location).
15
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