Figure 8A-29. Removing Spark Plug Frozen to Bushing
d. Removal of seized spark plugs in the cylinder may be accomplished by application of liquid carbon
dioxide by a Conical metal funnel adapter with a hole at the apex just large enough to accommodate
the funnel of a CO2 bottle. (Refer to Figure 8A-29.) When a seized spark plug cannot be removed by
normal means, the funnel adapter is placed over and around the spark plug. Place the funnel of the
CO2 bottle inside the funnel adapter and release the carbon dioxide to chill and contract the spark
plug. Break the spark plug loose with a wrench. A warm cylinder head at the time the carbon dioxide
is applied will aid in the removal of an excessively seized plug.
e. Do not allow foreign objects to enter the spark plug hole.
8A-38. INSPECTION AND CLEANING OF SPARK PLUG.
a. Visually inspect each spark plug for the following non-repairable defects:
1. Severely damaged shell or shield threads nicked up, stripped or crossthreaded.
2. Badly battered or rounded shell hexagons.
3. Out-of-round or damaged shielding barrel.
4. Chipped, cracked or broken ceramic insulator portions.
5. Badly eroded electrodes worn to approximately 50% of original size.
b. Clean the spark plug as required, removing carbon and foreign deposits.
c. Set the electrode gap at .015 to .018 inches.
d. Test the spark plug both electrically and for resistance.
Revised: 8/31/77
2E1
CHEROKEE ARROW III SERVICE MANUAL
POWER PLANT - LYCOMING
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