Farmall Super A Spark Plugs

Farmall Super A, AV, 100, 130, & 140 1939 - 1973

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Farmallsupera50
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Farmall Super A Spark Plugs

Postby Farmallsupera50 » Mon Jun 27, 2016 5:46 pm

I have a 1950 Farmall Super a that i bought last summer. I have went through the entire tractor replacing plugs, wires, oil change, the whole nine yards. I use this old tractor on disking 3 acres in preperation for planting produce. My super a runs great on new plugs but after it warms up good it starts to form a miss. And eventually runs worse and worse untill it either barely keeps running or stalls. I have been trying to narrow things down by doing valve adjustments rebuilt carb, ect. When i pull the plugs out #1 had what appeared to be oil on it and #3 had a lot of carbon build up. The other two plugs looked normal. So then i completed a compression test thinking it was bad rings, my compression averaged 89-93 on all cylinders with the best cylinder being #1 (the one with the "oil" on the plugs). When i put new or freshly cleaned plugs in, the tractor runs great for a little while then starts the process all over again! Help!

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Re: Farmall Super A Spark Plugs

Postby Don McCombs » Mon Jun 27, 2016 8:09 pm

What plugs are you currently using?
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Re: Farmall Super A Spark Plugs

Postby Farmallsupera50 » Mon Jun 27, 2016 8:37 pm

I had originally put autolites in, after those became fouled i put in champions in. They now are fouled too. I feel like there is something besides the sparkplugs causing my issue! Thanks

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Re: Farmall Super A Spark Plugs

Postby staninlowerAL » Mon Jun 27, 2016 9:09 pm

What is the number on the Champions? You might try a "hotter" plug to see if it makes any difference.

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Re: Farmall Super A Spark Plugs

Postby Farmallsupera50 » Mon Jun 27, 2016 9:38 pm

I believe they are champion d18. Thats what i put in them due to my research. Shouldent the original new plugs "autolites" be hotter and had the same result!?

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Re: Farmall Super A Spark Plugs

Postby Don McCombs » Mon Jun 27, 2016 10:04 pm

Try a set of Champion D-21s, or the equivalent heat range in the Autolites.
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Re: Farmall Super A Spark Plugs

Postby Farmallsupera50 » Mon Jun 27, 2016 10:11 pm

Okay i will give the hotter plugs a shot. Do you think im running too rich for the plugs im currently using?

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Re: Farmall Super A Spark Plugs

Postby Eugene » Tue Jun 28, 2016 2:49 am

Faulty ignition coil and/or condenser.
I have an excuse. CRS.

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Re: Farmall Super A Spark Plugs

Postby Stanton » Tue Jun 28, 2016 6:46 am

When you changed plugs and it ran again, was that while the engine was still warm from previously running, or a cold engine?

Following Eugene's line of thought, it may be that once the tractor warms up, the coil or condenser begins to show signs of fault. Just a thought.
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Re: Farmall Super A Spark Plugs

Postby Farmallsupera50 » Tue Jun 28, 2016 10:52 am

That is something i will definatly look at for fault. When i vhange the plugs and restart the tractor its off of a cold start not a warm one. Thanks for the advice

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Re: Farmall Super A Spark Plugs

Postby havoc1482 » Tue Jun 28, 2016 5:05 pm

D21 is what I use in my Super A.
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Re: Farmall Super A Spark Plugs

Postby Daniel H. » Mon Jul 04, 2016 6:37 pm

NGK AB6
The four most expensive words in tractor restoration: "We might as well..."

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Re: Farmall Super A Spark Plugs

Postby ccaissie » Sun Jul 17, 2016 7:30 am

I had a 1948 Chevy pickup that oil-fouled plugs and smoked due to oil control rings being shot. But it idled beautifully and had great compression DUE TO THE OIL GETTING TO THE COMPRESSION RINGS.
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