Farm Equipment - Allis B Spark Plugs

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Allis B Spark Plugs

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=11709
Printed Date: 27 Jan 2025 at 11:16am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Allis B Spark Plugs

Posted By: Joose
Subject: Allis B Spark Plugs
Date 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.

Replies:

Posted By: Hubert (Ga)engine7
Date Posted: 29 Apr 2010 at 8:11pm

Autolite 295. That gap sounds correct.

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Just an old country boy saved by the grace of God.

Posted By: Bill Long
Date 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.

Posted By: Brian Jasper co. Ia
Date 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.

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"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