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Allis B Spark Plugs
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Joose View Drop Down
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Joined: 10 Apr 2010
Location: Aubuen, MI
Points: 6 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Joose Quote  Post ReplyReply Direct Link To This Post Topic: Allis B Spark Plugs
    Posted: 29 Apr 2010 at 8:07pm
Anyone know what type of spark plugs should be installed on a 1948 Allis Chalmers B tractor or know where I can find this information? I've researched and found that the plug gap is 0.035 in. Is this correct? Any help would be appreciated. Thank you, Joose.
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Hubert (Ga)engine7 View Drop Down
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Joined: 12 Sep 2009
Location: Jackson Cnty,GA
Points: 6354 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Hubert (Ga)engine7 Quote  Post ReplyReply Direct Link To This Post Posted: 29 Apr 2010 at 8:11pm
Autolite 295. That gap sounds correct.
Just an old country boy saved by the grace of God.
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Bill Long View Drop Down
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Joined: 12 Sep 2009
Location: Bel Air, MD
Points: 4556 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Bill Long Quote  Post ReplyReply Direct Link To This Post Posted: 29 Apr 2010 at 9:48pm
We used to use AC-45, AC-47, and AC-48, depending on the age and engine condition of the tractor.
I think 35 is a good gap but my memory reminds me of 40.
However, reports indicate that the AC plug is no longer that good.  Autolight is the plug of choice.
Good Luck!
Bill Long
ps:  Check with Steve NJ - Custom Circuits.  He will have the information you need.
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Brian Jasper co. Ia View Drop Down
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Joined: 11 Sep 2009
Location: Prairie City Ia
Points: 10508 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian Jasper co. Ia Quote  Post ReplyReply Direct Link To This Post Posted: 29 Apr 2010 at 10:15pm
I have a set of AC R45 plugs in my CA. With point style ignition, I wouldn't go over .030 gap. The shop manual for the D10/12 shows .025 for a plug gap. I have mine set at .045, but I'm using a Pertronix Ignitor module and Flamethrower coil.
"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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