Re: Spark plugs

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Posted by 36 coupe on November 13, 2017 at 06:27:15 [URL] [DELETE] :

In Reply to: Spark plugs posted by Dave Smith on November 12, 2017 at 19:59:01:

It leaves a film of carbon on the insulator nose.I have tested a gas fouled plug with a model T coil.The spark voltage streams down the insulator instead of jumping the electrode gap.You need a hotter plug to keep the carbon burnt off.My 640 had a new set of H10s when I bought it.Had a lot of trouble with #1 plug fouling.Put in H12s,fouling stopped.You can soak fouled plugs in lacquer thinner in a covered jar.I have found that prolonged idling can foul H12s.Auto Lite 437s are the best choice for Ford tractors.Champion plugs are made in Mexico now and have reports of plug shells breaking off, leaving the threaded portion in the cylinder head.I have had it happen in an Olds v8.This problem was reported in the Farm Show magazine years ago .

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