Allis G Spark Plug Problem
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=114663
Printed Date: 15 Sep 2025 at 2:35am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Allis G Spark Plug Problem
Posted By: ogeechee
Subject: Allis G Spark Plug Problem
Date Posted: 14 Nov 2015 at 1:25am
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The Manual calls for an AC 45 plug. Is that the same as an AC R45? I appreciate your response. Dan
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Replies:
Posted By: Burgie
Date Posted: 14 Nov 2015 at 4:45am
That is the replacement.
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"Burgie"
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Posted By: jaybmiller
Date Posted: 14 Nov 2015 at 6:11am
I'm 'thinking' the R means it has a built in resistor for noise suppression ??
Be nice to KNOW though.....
Jay
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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Posted By: Steve in NJ
Date Posted: 14 Nov 2015 at 6:15am
The "R" stands for a Resistor plug. Although it probably wouldn't hurt the ignition system any because its a Distributor, the plug that works quite well in a G model w/Continental is the Autolite 295's. As a matter of fact, the Autolite 295's work good in a lot of the older AC machines. The Autolite 303 is an optional plug, and is a fuzz colder than the 295. Worn engines work better with the 295's mainly because its a little hotter plug... HTH
Steve@B&B
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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Posted By: ac45dave
Date Posted: 14 Nov 2015 at 8:24am
Iv'e found this to be helpful. http://www.autolitecatalog.com/Application.aspx?b=A" rel="nofollow - autolite application look-up
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54 wd-45gas ; 56 wd-45d N/F w/fact p/s ; 63 d-17 sIII N/F gas ; 60 D14 N/F ; 67 d-17 sIV N/F gas ; 63D15 sII W/F; 39rc#667 ; 2021 massey 4710 fwa ; gravely 2 wheel tractors
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Posted By: Bill Long
Date Posted: 14 Nov 2015 at 10:09am
When we sold them we lived with the AC-45, AC-47, and AC-48, depending on how "hot" a plug you needed - we used the AC-48's in the older machines.
However, that was in the 40's 50's and very early 60's. In today's market I have heard very interesting reports that the AC plugs are not all that good.
Listen to what my friend SteveNJ says. He is our on line electrical expert and knows from deep experience. I would fully rely on him.
Take good care of your G. You have a Classic Allis Chalmers tractor. The best plowing tractor I sold.
Good Luck!
Bill Long
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Posted By: ogeechee
Date Posted: 14 Nov 2015 at 11:58am
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I appreciate all of your responses and thanks for taking the time to answer my questions. Autolite 295s ordered.
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