How to Remove Ceramic From a Broken Spark Plug

Spark plugs build up carbon deposits from the internal combustion in the engine that can make the threads seize when you try to remove them. A spark plug wrench fits over the top of a plug to remove it. When plugs seize, the wrench turns and breaks off the ceramic top while the threads are still intact. Spark plug extractors have teeth that move outward to contact the sides of the plug and put pressure on them to remove broken plugs.

Instructions

1

Spray the broken spark plug around the threads liberally with penetrating oil. Allow the oil to sit according to the package directions. Usually, the oil needs about 20 minutes to thoroughly soak into the threads.

2

Place a spark plug extractor into the center of the broken spark plug. If your extractor is the drill-bit type, insert the bit into a drill.

3

Turn a manual extractor slowly counterclockwise while pushing down on the spark plug with force. Place the drill-bit type in the center of the spark plug, turn the drill to reverse and turn the drill on. The broken portion will release in the threads and come out of the engine.