8-45. SPARK PLUGS.
8-46. REMOVAL OF SPARK PLUGS.
a.
Loosen the coupling nut on the harness lead and remove the terminal insulator from the spark plug
barrel well. (A crows foot adapter is needed to remove the lower spark plugs.)
NOTE
When withdrawing the ignition cable lead connection from the plug, care
must be taken to pull the lead straight out and in line with the center line of
the plug barrel; otherwise, a side load will be applied which frequently
results in damage to the barrel insulator and connector. If the lead cannot
be removed easily in this manner, the resisting contact between the
neoprene collar and the barrel insulator will be broken by a rotary twisting
of the collar. Avoid undue distortion of the collar and possible side loading
of the barrel insulator.
b. Remove the spark plug from the engine. In the course of engine operation, carbon and other
combustion products will be deposited on the end of the spark plug and will penetrate the lower
threads to some degree. As a result, greater torque is frequently required for removing a plug than for
its installation. Accordingly, the torque limitations given do not apply to plug removal, and sufficient
torque must be used to unscrew the plug. The higher torque in removal is not as detrimental as in
installation, since it cannot stretch the threaded section. It does, however, impose a shearing load on
this section and may, if sufficiently severe, produce a failure in this location.
NOTE
Torque indicating handle should not be used for spark plug removal
because of the greater torque requirement.
c.
Place spark plugs in a tray that will identify their position in the engine as soon as they are removed.
NOTE
Spark plugs should not be used if they have been dropped.
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 C02 bottle. (Refer to Figure 8-29.) 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 C02 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.
Revised: 8/31/77
2B22
CHEROKEE ARROW III SERVICE MANUAL
POWER PLANT - CONTINENTAL
Summary of Contents for ARROW III
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