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A sparkplugs

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1 Dollar

08-07-2005 09:27:50

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What kind of spark plugs should I use in my 1937 A. It has Champion D16 right now. Thanks

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08-07-2005 17:37:54

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Re: A sparkplugs in reply to 1 Dollar, 08-07-2005 09:27:50

! dollar how old are you do u really know what your doing?

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Duane Larson

08-07-2005 10:12:10

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Re: A sparkplugs in reply to 1 Dollar, 08-07-2005 09:27:50

1 Dollar,
There is something unusual here - all unstyled A's came with blocks which used 7/8"-18 thread/inch plugs, and the D16 has an 18mm thread used on the styled A's. Either there are some sort of inserts reducing the block spark plug hole to 18mm, your block has been changed out to a later one, or you have a later model tractor than you think.

But if you just want to change out plugs, I would go with a Champion D21 or D23, or an Autolite 3116. These are all hotter plugs than the D16 and reduce plug fouling under light work conditions. If you are going to plow, run a thresher, or otherwise work the tractor the D16 would be fine.

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Rob in MI

08-07-2005 18:34:29

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Re: A sparkplugs in reply to Duane Larson, 08-07-2005 10:12:10

Hey Duane, what plug would work best in a 1927 JD model D? Thank You

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Duane Larson

08-07-2005 21:02:57

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Re: A sparkplugs in reply to Rob in MI, 08-07-2005 18:34:29

Rob,
Your D came with Champion No. 7 - 1/2" pipe thread plugs. Problem is the plug was not lettered, so you have to know what they look like. Other problem is Champion also saw fit to make a No. 7 18mm plug, which causes much confusion. In September 1929 the No. 7 pipe thread was renamed No. 31, and that was printed on the insulator. NOS Champion 31 plugs are around, you might check eBay, or Don McKinsey, PO Box 94, Wilkinson, IN 46186 as he has a huge inventory of NOS plugs. The 31 is a 2-piece take apart plug which makes cleaning easy.

Or, you can get the "modern" Champion 525 or Autolite 3095 1/2" pipe thread plugs - both are available but both are one piece so cleaning is more difficult. The NOS plugs normally also have a glazed insulator which makes cleaning just a wipe-off with carb cleaner.

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Rob in MI

08-08-2005 19:17:34

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Re: A sparkplugs in reply to Duane Larson, 08-07-2005 21:02:57

Thanks for the info Duane, it is greatly appreciated!!!

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1 Dollar

08-07-2005 10:54:59

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Re: A sparkplugs in reply to Duane Larson, 08-07-2005 10:12:10

It is a Power Block that my Grandpa got in Delphos OH. That is why it is different.

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Duane Larson

08-07-2005 13:23:45

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Re: A sparkplugs in reply to 1 Dollar, 08-07-2005 10:54:59

1 Dollar,
Ahh, yes, forgot about the power block option. You also have a head from a later A then, so you will have to be careful when using a parts book for your unstyled A as several engine parts will be different.
Sounds like a strong tractor you have.

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1 Dollar

08-07-2005 13:32:48

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Re: A sparkplugs in reply to Duane Larson, 08-07-2005 13:23:45

It also has a DLTX 51 carb that I need to take apart to fing out why it is flooding. If you have any tips for that that would be nice too.

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Duane Larson

08-07-2005 16:44:11

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Re: A sparkplugs in reply to 1 Dollar, 08-07-2005 13:32:48

1 Dollar,
You can check your float - remove the big nut holding the bowl on, and the fuel line going to the carb. Remove the bowl, and by removing either of the two brass float bearings you can remove the float pin and the float. Check if there is fuel sloshing around in the float, or if it appears to have been "repaired". If you want to check the float further, place the float in some boiling water (remove pan from heat source before submerging float) and look for bubbles coming from the float, indicating a hole in the float (the hot (pressurized) air inside the float comes out through the hole). Floats cost less than $20, so I would replace if there is any question.

The needle and seat is another matter. You might try spraying some carb cleaner on the needle and seat - a piece of trash may be causing the needle to hang. If you have to replace the needle/seat, my experience shows that a new unit will often leak also, but hopefully not enough to be a problem during operation. You MUST turn the fuel off to the carb when the tractor is shut off to keep fuel from leaking into the cylinders and diluting the oil.

Hopefully a good cleaning of the needle and seat will solve your problem.

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1 Dollar

08-07-2005 17:03:58

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Re: A sparkplugs in reply to Duane Larson, 08-07-2005 16:44:11

Thanks, I will try all of your suggestions.

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shannon from ohio

08-07-2005 13:53:59

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Re: A sparkplugs in reply to 1 Dollar, 08-07-2005 13:32:48

The flooding problem is caused by the float or needle and seat not doing their intended jobs.Fire them and get new ones??

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Dan hill

08-13-2005 05:06:31

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Re: A sparkplugs in reply to shannon from ohio, 08-07-2005 13:53:59

I find dirt getting past the carb inlet screen causes most flooding,Found my screen had been cut by a halfwit,better check it.Floats with gas inside are common.I fix most leakers as 20.00 bills are hard to come by around here.Check the sediment bowl, make sure it has a good screen in place.Use a screened funnel when adding gas to the tank.

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