52
7. Examine interior of plug in good light. Remove any clean-
ing compound with compressed air. If traces of carbon or
oxide remain in plug, finish the cleaning with a light blast-
ing operation. Clean firing surfaces of center and side
electrodes with several strokes of a fine cut file.
8. When spark plugs have been thoroughly cleaned, care-
fully inspect them for cracks or other defects that may
not have been visible before cleaning.
9. Use a round wire feeler gauge to check the gap between
the spark plug electrodes. (Flat feeler gauges will not
give a correct measurement if the electrodes are worn.)
Adjust gap by bending the side electrode only. Bending
the center electrode will crack the insulator. Setting the
spark plug gap to any other specification in an attempt to
improve idle or affect engine performance is not recom-
mended.
10. See the diagrams for correct installation of spark plugs
and wires.
For proper engine performance it is very important that the
correct spark plugs be used. When installing spark plugs,
make sure that the threads in the cylinder head and all sur-
faces on plugs and in cylinder heads are clean. Tighten spark
plugs the specified amount. All engines use tapered seat
plugs without gaskets.
DANGER!
Do not operate engine if spark plug boots or high-ten-
sion leads are torn or cracked. This condition can allow
external sparks, which could ignite any fuel vapors in
the engine compartment.
Spark plug wires must be arranged between the distributor
cap and spark plugs in the order of firing sequence. If spark
plug wires are not correctly installed, misfiring or cross-firing
will result.
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