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9/27/01 AC 43.13-1B CHG 1 FIGURE 8-6b. Typical oil-fouled spark plug. d. Metal Deposits. Whenever metal spray is found on the electrodes of a spark plug, it is an indication that a failure of some part of the engine is in progress. The location of the cyl- inder in which the spray is found is important in diagnosing the problem, as various types of failures will cause the metal spray to appear differently. For example, if the metal spray is located evenly in every cylinder, the problem will be in the induction system, such as an im- peller failure. If the metal spray is found only on the spark plugs in one cylinder, the problem is isolated to that cylinder and will generally be a piston failure. In view of the secondary damage which occurs whenever an engine part fails, any preliminary indication such as metal spray should be thor- oughly investigated to establish and correct the cause. FIGURE 8-6c. Typical spark plug with cracked core nose. e. Flashover. It is important that spark plug terminal contact springs and moisture seals be checked regularly for condition and cleanliness to prevent “flashover” in the con- nector well. Foreign matter or moisture in the terminal connector well can reduce the insula- tion value of the connector to the point the ig- nition system voltages at higher power settings may flash over the connector well surface to ground and cause the plug to misfire. If moisture is the cause, hard starting can also re- sult. The cutaway spark plug shown in fig- ure 8-7 illustrates this malfunction. Any spark plug found with a dirty connector well may have this condition, and should be recondi- tioned before reuse. Par 8-16 Page 8-13PDF Image | AFS-640
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