WD-45 Spark Plug Type????
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Category: Allis Chalmers
Forum Name: Farm Equipment
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=149288
Printed Date: 18 Dec 2025 at 3:00pm
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Topic: WD-45 Spark Plug Type????
Posted By: Steve-F
Subject: WD-45 Spark Plug Type????
Date Posted: 08 Apr 2018 at 4:18pm
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What brand model of spark plugs should I buy for my WD-45 and what gap should they be set at? Thanks, Steve |
Replies:
Posted By: EPALLIS
Date Posted: 08 Apr 2018 at 8:07pm
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Probably a lot of debate about this topic. Nevertheless, I always used AC-45 spark plugs. For gap I always set about .035. Basically because the owners manual said gap them .030-.040. I never had any issues with that plug or gap so it must be somewhat reliable information. Hope that helps. Thanks. |
Posted By: dawntreader74
Date Posted: 08 Apr 2018 at 10:52pm
| yes the AC-45 plug works the best; but the 35 gap is to big' works the best at less then 30' like 28 is more like it on a wd or wd45 d17 an so on little hotter worked better fore me on working tractors. |
Posted By: SteveM C/IL
Date Posted: 08 Apr 2018 at 11:48pm
| My WD & 45 have had AC45's forever gapped at .035.Never had a problem. All I'm saying is,it works for me. The WD has been here since new in 49. |
Posted By: dawntreader74
Date Posted: 09 Apr 2018 at 1:33am
| steve; if it works' thats all that matters; it's hard to fine good fuel now a days also. |
Posted By: SteveM C/IL
Date Posted: 09 Apr 2018 at 11:13am
For sure! Mine comes off the delivery truck so I'm often burning 6-8 month old gas and I can no longer get non alcohol fuel. It's a wonder anything around here runs.
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dawntreader74 wrote:Posted By: DougS
Date Posted: 09 Apr 2018 at 8:28pm
Does your premium contain ethanol? Usually it doesn't, but you'll pay for it. AVGAS won't contain ethanol either, but you'll really pay for it. |
Posted By: SteveM C/IL
Date Posted: 09 Apr 2018 at 9:30pm
| I don't know but would be surprised if bulk truck offers premium. |
Posted By: dawntreader74
Date Posted: 09 Apr 2018 at 10:08pm
| helps a lot to put a few gallons of 110 race gas in a tank' to brighten it up some' sure can tell it's there ' helps blow the cobs out |
Posted By: DougS
Date Posted: 10 Apr 2018 at 5:43am
I don't know which supplier would and which wouldn't. If the supplier also has filling stations that have premium, the odds are they'll bring it to you in bulk too. |
Posted By: SteveM C/IL
Date Posted: 10 Apr 2018 at 8:20am
| They do bulk only.The pumps in town came out years ago. |
Posted By: DougS
Date Posted: 10 Apr 2018 at 8:43am
| Call them. You might be surprised. You may have to make a minimum order, though. I use to order number 1 diesel, but had to take a 300 gallon minimum. |
Posted By: Brian G. NY
Date Posted: 10 Apr 2018 at 10:19am
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Both my WD and WD-45 Operator's Manuals state plug gap should be set .028" to .032". I "shoot for" .030! Point gap is .020" for both a mag or a distributor.
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Posted By: SteveM C/IL
Date Posted: 10 Apr 2018 at 1:47pm
| I have in front of me the "operating instructions maintenance and repair parts illustrations" for AC WD tractor that came with dad's new WD in 1949.No copyright date. It says .030-.040 for plugs.Keep in mind this used a mag. Also says use Autolite AN7 or AC45 plugs for gasoline and Autolite A11 or AC47 for low octane fuel. |
Posted By: Steve-F
Date Posted: 10 Apr 2018 at 5:07pm
| Thanks for the replies guys! Where can these AC45 plugs be purchased? Called NAPA today and they do not sell them. |
Posted By: chaskaduo
Date Posted: 10 Apr 2018 at 5:33pm
I see them on ebay, $$$!!! ------------- 1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp |
Posted By: archangel_cpj
Date Posted: 10 Apr 2018 at 7:18pm
| Looks like advanced auto Carrys the.... |
Posted By: dawntreader74
Date Posted: 10 Apr 2018 at 7:37pm
| farm+fleet store has ac45's ac46 also. |
Posted By: Dan Hauter
Date Posted: 10 Apr 2018 at 7:48pm
| You guys are a wealth of info. Thanks. What about a WC or WF? Same spark plug recommendations? |
Posted By: Clay
Date Posted: 11 Apr 2018 at 10:05am
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https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313.TR0.TRC0.H0.TRS0&_nkw=AC+45XL+spark+plug&_sacat=0" rel="nofollow - https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313.TR0.TRC0.H0.TRS0&_nkw=AC+45XL+spark+plug&_sacat=0
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Posted By: Brian G. NY
Date Posted: 12 Apr 2018 at 10:38am
For the heck of it, I looked at my WC manual which shows a picture of a mag in the text and it gives the plug gap as .030" - .040". My conclusion, plugs on tractors with mags should be set at .030" - .040" and tractors with distributors should be set at .028" - .032".
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