REMOVING CARBON
CLEANING A PLUG. Carbon can be removed from the interior of a plug with a knife-blade. A nail file, sandpaper, or the striking composition on a safety-match box can be used to brighten those parts of the point across which the spark jumps. Regulate the gap between the points with a gauge, but if you haven’t one, adjust the points so that ,a worn threepenny bjt will just pass between them. Wipe the porcelain parts with a clean rag. Never use a knife on mica cores. With undemountable plugs, turn the points upward, fill with petrol, and set alight. The suriace will be comparatively clean when the flame burns itself out. In the case of a demountable plug, take it apart and soak in kerosene to soften the carbon. If the plug is jammed and will not come out unless the valve cap comes with it, remove them both and clean the plug as usual. Another way of cleaning plugs is to soak them in ordinary household ammonia. Pour the ammonia into a widemouthed bottle to a depth of an inch or two. Place the spark plug in the bottle, and seal it to prevent escape of the fumes. Leave the spark plug to soak for several hours and it will be found that carbon, dirt, and oil accumulations have been removed. There is no need to take the plug to pieces with this method.
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https://paperspast.natlib.govt.nz/newspapers/HBTRIB19321101.2.26.3
Bibliographic details
Hawke's Bay Tribune, Volume XXII, Issue 272, 1 November 1932, Page 4
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237REMOVING CARBON Hawke's Bay Tribune, Volume XXII, Issue 272, 1 November 1932, Page 4
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