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dc case with mag...wich spark plug to use

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tooltimejim

05-17-2009 08:42:46

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I want to put new spark plugs in, the spark plugs i have now, say champion d-11. i would like to try autolite plugs, but not sure wich number i should get to use. I have a mag on this DC. thanks, Jim

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H. J. Childress

05-21-2009 12:22:10

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Re: dc case with mag...wich spark plug to use in reply to tooltimejim, 05-17-2009 08:42:46

just got my first CASE a 51 D. pulled plugs that are CHAMP D16 what should they be gapped at? every one of them are gapped different.tractor has mag. waiting on manual so as not to be so dumb about CASE tractors. Thanks HJC

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CWH

05-21-2009 12:40:01

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Re: dc case with mag...wich spark plug to use in reply to H. J. Childress, 05-21-2009 12:22:10

.025" if I'm not mistook.

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tooltimejim

05-19-2009 19:22:32

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Re: dc case with mag...wich spark plug to use in reply to tooltimejim, 05-17-2009 08:42:46

Thanks for all the ideas on wich plug to use. I have far less mechanical experience then you guys, but everyday i grab a wrench, im learning. It is obvious to me that I can learn , just by listening to others with many more years of wrenching then i have. I apoligize that i ask so many questions, and i do very much appreciate the time you guys give me. Thanks , Jim

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Camboted

05-18-2009 00:54:42

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Re: dc case with mag...wich spark plug to use in reply to tooltimejim, 05-17-2009 08:42:46

You'll get so many opinions you'll be more confused after the question that before, but herd is what I've herd from an old "Geezer" who's repaired mags for 60 years. "Don't use cadmium plated plugs". He explained why but I don't remember the details except that it shortens mag life. My 2 cents worth.

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Don Rudolph

05-17-2009 21:03:52

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Re: dc case with mag...wich spark plug to use in reply to tooltimejim, 05-17-2009 08:42:46

Jim, My magneto repair guy says to use non resistor plugs and wires to get better mag life. I don't know if this is true or not, but mags are expensive to repair, so I'm following his advice. Don

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Brian Payne

05-17-2009 20:57:45

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Re: dc case with mag...wich spark plug to use in reply to tooltimejim, 05-17-2009 08:42:46

My Case Model S Operators Manual says either AC type 45 or Champion J8 or equivalent.

AC being AC Delco

we used AC Delco R45's in ours with no problems

with AC spark plugs the R is for resistor,
the 4 is the thread size 14 mm and the 5 is the heat range on a scale of 0=Cold to 9=Hot Hope this helps Take Care,

Brian Payne

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dboll

05-18-2009 20:34:39

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Re: dc case with mag...wich spark plug to use in reply to Brian Payne, 05-17-2009 20:57:45

45AC/J-8 Champion fits an SC not a DC. I agree with mEL on Autolites, I use 386's, next choice 86 or 87 AC and last D-21 Champ.

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mEl

05-17-2009 17:51:52

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Re: dc case with mag...wich spark plug to use in reply to tooltimejim, 05-17-2009 08:42:46

I use Autolite plugs in all my engines and have used standard tips and extended tips, the 3116 extended tip is my plug of choice but the 386 I believe is the standard if you prefer. I believe they equate to the Champ D16 and D15Y very favorably but in recent years the Champs have a tendency to foul very easily. mEl

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L.Lamp

05-17-2009 19:34:42

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Re: dc case with mag...wich spark plug to use in reply to mEl, 05-17-2009 17:51:52

I have been having poor luck with Autolite plugs for my DC's and SC's as well. If you ever flood the engine you just as well throw away the plugs. They start grounding out up inside the insulator. I have had to replace Autolite plugs that were less than two months old. I use Champion with the next higest heat range. Do you have any idea what causes this to happen?

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Ande

05-17-2009 18:51:44

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Re: dc case with mag...wich spark plug to use in reply to mEl, 05-17-2009 17:51:52

mEl
Your saying that you use a 3116 Autolite for the "DC3"? And you have gotten better results?
(ps... i have a 49 DC3)

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mEl

05-18-2009 04:23:40

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Re: dc case with mag...wich spark plug to use in reply to Ande, 05-17-2009 18:51:44

Yes, 3116 and having exactly the opposite results as LL, LL is a valuable contributor to this forum and his experiences are as valid as mine, I am an advocate of whatever works for you!! Maybe the gas is different in our area or something. For years I was a Champ advocate but in recent years Champs foul to easily and I have seen many other people with similar problems with Champs, incidently that is my lifes work, keeping tractors running and haveing to work with all makes and models. I use 3116 in our 467 CID DC3 puller without incident, don't even go with a cooler plug, the 3116 seems to handle the very high CR's and 115 octane fuel well. mEl

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John Saeli

05-18-2009 09:46:43

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Re: dc case with mag...wich spark plug to use in reply to mEl, 05-18-2009 04:23:40

Couldn't agree w/ Mel any more. My experience exactly. When I do foul a plug, I use the torch on very low flame & burn the wetness out of it. Make them like new.

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