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8
4
3
6
5
7
2
1
1
2
5
3
7
4
6
8
1
2
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4
5
6
1
3
5
2
4
6
Checking and changing spark
plugs
1. Twist and pull only on the spark plug wire boot (pulling
on wire may cause separation of the core of the wire).
2. Remove spark plugs using a 5/8-inch spark plug socket
or a 5/8-inch box wrench. Use care to avoid cracking the
spark plug insulators.
3. Carefully inspect the insulators and electrodes of all spark
plugs.
•
Replace any spark plug which has a cracked or bro-
ken insulator or which has loose electrodes.
•
If the insulator is worn away around the center elec-
trode, or the electrodes are burned or worn, the spark
plug is worn out and should be discarded.
•
Spark plugs that are in good condition, except for
carbon or oxide deposits, should be thoroughly
cleaned and gapped.
The spark plug wires are a special resistance type. The core
is carbon-impregnated linen. This type wire is superior to
copper core wire in its resistance to crossfire; however, it is
more easily damaged than copper core. For this reason, pull
on the spark plug boots to remove the spark plug wires, rather
than pulling on the wire insulation. If the wire is stretched,
the core may be broken with no evidence of damage on the
outer insulation. If the core is broken, it will cause misfiring.
In the case of wire damage, it is necessary to replace the
complete wire assembly since a satisfactory repair cannot
be made.
4. Clean ignition wires with a cloth moistened in kerosene,
and wipe dry. Bend wires to check for brittle, cracked or
loose insulation.
Defective insulation will permit mis-
firing, cross-firing, or spark to ground; therefore,
defective wires must be replaced.
5. If the wires are in good condition, clean any terminals
that are corroded and replace any that are broken or dis-
torted. Replace any wires with broken or deteriorated
cable nipples or spark plug boots.
6. Clean spark plugs. Spark plugs that have carbon or ox-
ide deposits should be cleaned in a blast type spark plug
cleaner. Scraping with a pointed tool will not properly
remove the deposits and may damage the insulator. If
spark plugs have a wet or oily deposit, dip them in a de-
creasing solvent and dry thoroughly with compressed air.
Oily plugs will cause the cleaning compound to pack in
the shell. Carefully follow the instructions of the manu-
facturer of the cleaner being used. Clean each plug until
the interior of shell and entire insulator is cleaned. Avoid
excessive blasting.
Summary of Contents for 4.3OSi-C
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