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ELECTRICAL SYSTEM
A CAUTION! Electrical storage batteries
give off highly inflammable hydrogen gas
when charging and continue to do so for
some time after receiving a steady charge. Do not
under any circumstances allow an electric spark or
an open flame near the battery. Do not lay tools
across battery terminals as this may result in a
spark or short circuit which amy cause an ex-
plosion. Be careful to avoid spilling any electrolyte
on hands or clothing.
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 seal the plug and assure a
good heat transfer between the plug and cylinder
head.
Replace defective plug with new plug. See your
I nternational Harvester dealer for a correct replace-
ment plug.
CAUTION! Acid or electrolyte should
never be added except by a skilled
battery man. Under no circumstances
add any special bettery "dopes", solutions, or
powders.
Cleaning
Spark Plug
Clean spark plug with a pen knife or wire brushand
solvent. If electrode is burned away or the
porcelain is cracked, replace with new plug.
Occasionally remove the battery cables and bright-
en the terminal contact surfaces with wire wool,
and reassemble. Apply a light coat of vaseline or
chassis lubricant. Be sure terminals are clamped
tightly, the rubber cover is sl id over the positive
terminal, and that battery is fastened securely in
the battery box. Replace defective cable, and keep
vent holes in battery filler caps open.
CAUTION! Wh.
cables, remove
first and then
positive side of battery.
result causing an accidel
reinstalling the battery
cedure.
SPARK
PLUG
NOTE: Remove all dirt from base of spark plug
before removing.
Checking the spark plug gap.
Set gap at .O30-inch.
Remove the spark plug after every 100 hours of
operation for cleaning and checking the gap. Whenadjusting
the gap, always bend the outer electrode.
Never bend the insulator. If gap between the
electrodes is too great, the engine will misfire and
be hard to start.
NOTE: Do not use abrasive cleaning machine;
because any grit introduced into the engine could
cause severe damage.
16
~n removing the battery
the white cable (ground)
the red cable from the
Otherwise, sparks mayIt.
When reattaching or
reverse the above pro-