Specifications

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).