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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