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AC 43.13-1B CHG 1 9/27/01 FIGURE 8-6. Typical carbon-fouled spark plug. b. Fused Electrodes. There are many dif- ferent types of malfunctions which result in fused spark plug electrodes; however, most are associated with pre-ignition either as the cause or the effect. For this reason, any time a spark plug is found with the following defects, fur- ther investigation of the cylinder and piston should be conducted. (1) Occasionally, the ceramic nose core will crack, break away, and remain trapped be- hind the ground electrode. This piece of insu- lation material will then buildup heat to the point it will ignite the fuel/air mixture prema- turely. The high temperatures and pressures encountered during this condition can cause damage to the cylinder and piston and ulti- mately lead to fusing and shorting out of the plug. (See figure 8-6c.) FIGURE 8-6a. Typical lead-fouled spark plug. (2) Corrosive gases formed by combus- tion and the high voltage spark have eroded the electrodes. Spark plugs in this condition re- quire more voltage to fire—often more than the ignition system can produce. (See fig- ure 8-6d.) c. Bridged Electrodes. Occasionally, free combustion chamber particles will settle on the electrodes of a spark plug and gradually bridge the electrode gap, resulting in a shorted plug. Small particles may be dislodged by slowly cycling the engine as described for the oil- fouled condition; however, the only remedy for more advanced cases is removal and replace- ment of the spark plug. This condition is shown in figure 8-6e. Page 8-12 Par 8-16PDF Image | AFS-640
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