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Ford 9N, 2N & 8N Discussion Forum
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Re: What could have happened? H12 Plug issue-Dell?

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Dell (WA)

09-30-2013 11:02:11

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Bill.........dunno.......besides heat range, sparkies have threaded shell specs; yer 9N flathead is spec'd fer 7/16" reach. There are also 1/2" reach and 3/4" reach. From yer description, somehow yer H12 has 1/2" reach which would extend yer sparkie tip further into the engine which would allow yer VALVE to pop-up and BEND the GROUND electrode. Surprizingly enuff, ALL sparkies threaded diameter is 14mm and 19mm (3/4") hex head fer wrench removal. While yer N9 flathead was originally spec'd fer H10 Champions, with todays "no-lead" gasoline, a "HOTTER" plug is recommended, and H12 is "hotter". ...BUT... because of quality control issues, we recommend AutoLite 437's gapped 0.025". ........HTH, Dell, yer self-appointed sparkie-meister

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09-30-2013 13:09:50

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 Re: What could have happened? H12 Plug issue-Dell? in reply to Dell (WA), 09-30-2013 11:02:11  
Would you believe with all 4 plugs smashed like this my 9N still started? It was hard to get it to catch but it did. These are unreal tractors. Oh I am still at 6V as well....

Usually even with sitting all winter it turns twice and starts every time. Sure it leaks a little oil, no live hyd etc but I bet the new tractors being built now won't be running like this when they are 72 years old.

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