Reply To: Had very interesting Spark plug Failure, maybe this info could help others

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#16083
GregCrago

Update:

The underside of the head has large BLACK STREAKS, almost like someone took a spray can and painted the bottom of the cyclinder head.

After talking with some engine experts, It may appear that the spark plug failure was not instant, but may have been a slow leak over many miles. Since it was under the head, I did not see this black mark forming. The end result was the slow leak around the insulator eventually worked the insulator out and then I heard the exhaust and lost power in the engine.