Electrical System; Engine Cooling - International Harvester Company 75 Operator's Manual

ELECTRICAL SYSTEM
Remove the spark plug after every 100 hours of
operation for cleaning and checking the gap. When
adjusting the gap, always bend the outer electrode.
Never bend the insulator. If gap between the
electrodes is too great, the engine will misifre and
be hard to start.
NOTE: Do not use abrasive cleaning machine;
because any grit introduced into the engine could
cause severe damage.
Always use a spark plug wrench when removing or
reinstalling the plug.
Be sure the gasket is in good condition, and screw
plug in tightly. Do not tighten more than enough
to compress the gasket to seat the plug and assure a
good heat transfer between the plug and cylinder
head.
Replace defective plug with new plug. Use a
Champion CJ-8 spark plug or equivalent. See your
International Harvester dealer for a correct re-
placement plug.
Cleaning Spark Plug
Clean spark plug with a pen knife or wire brush
and solvent. If electrode is burned away or the
porcelain is cracked, replace with new plug.
Checking the spark plug gap.
Set gap at .O30-inch.
ENGINE COOLING
Remove the cover screws, lift the air cleaner cover
and carefully remove the element to prevent dirt
from entering the carburetor.
This is an air cooled engine. Air must circulate
freely around the engine. Keep the cooling fins and
housing area free of accumulated dirt and trash or
engine will overheat and result in damage to
moving parts.
Wash the foam element in kerosene or liquid
detergent and water to remove all dirt. Also clean
the air cleaner body and cover.
Wrap the foam element in a cloth and squeeze dry.
Then, saturate the element in engine oil (SAE-30).
Squeeze the element to remove excess oil and
reassemble and fasten to carburetor with screw.
OIL FOAM AIR CLEANER
Clean and re-oil the air cleaner element every 25
hours under normal operating conditions. Under
extremely dusty conditions, clean the element
every few hours.
NOTE: Replace air cleaner mounting gaskets that
are worn or damaged, to prevent dirt or dust
entering engine through improper sealing.
To clean the element, proceed as follows:
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