Spark plug heat ranges
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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=119799
Printed Date: 14 May 2025 at 3:17am
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Topic: Spark plug heat ranges
Posted By: bobkyllo
Subject: Spark plug heat ranges
Date Posted: 02 Mar 2016 at 7:10pm
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My d14 is going to need a tune up. Do I pulled the plugs and they look OK but not great. So I'm going to replace them. The previous owner claimed it burnt a little oil. Plugs don't really look like it but I haven't run it all that much. Never the less I'm going to change plugs and currently it has champion plugs. Model j8c. Is there one that is a touch hotter?
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Replies:
Posted By: BPM75
Date Posted: 02 Mar 2016 at 7:40pm
Others may disagree with me but I would run AC Delco plugs and not the Champions. My D17 has been in the family since it was new and my Dad said they never could vet Champions to run in it they'd put ACs in and it would run great, I can't remember the size off the top of my head, Im thinking R43 but not sure.
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59 D17 gas nf, 66 XT 190, 69 220.
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Posted By: norm[ind]
Date Posted: 02 Mar 2016 at 7:45pm
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do not use champions???deco 295 05 0r 303 ,s
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Posted By: ac45dave
Date Posted: 02 Mar 2016 at 7:46pm
i vote for ac45 or autolite 295. http://www.autolite.com/Productfinder/Home/PartInterchanges?strForSearch=j8c" rel="nofollow - check this
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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: Acdiesel
Date Posted: 03 Mar 2016 at 10:50am
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YEP, AC DELCO R45
DAN
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D19 Diesel,D17 Diesel SER.3
2-D14, 2-D15 SER.II WF/NF
D15 SER.2 DIESEL
D12 SER.I, D10 Ser.II
2-720'S D21 Ser. II
Gmc,caterpillar
I'm a pharmacist (farm assist) with a PHD (post hole digger)
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Posted By: DougS
Date Posted: 03 Mar 2016 at 11:46am
Go with the standard heat ranges. If you seldom work your tractor hard or it burns a little oil, move up one heat range. If you work your tractor hard you may need to move down one range. You'll know after you make your first plug change.
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Posted By: WEL(TN)
Date Posted: 03 Mar 2016 at 11:48am
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I have been using Autolite 295 for along time however the last several I have purchased had cracked porcelain right out of the box. The cracks are in the area where the porcelain ends and the hex begins. Others I know of have also complained. I think I will go back to AC 45s.
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Posted By: wfmurray
Date Posted: 03 Mar 2016 at 12:12pm
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The last no on the plug is usually the heat range(was in the old school).If you are using A C 45 to go hotter go 46 and as mention above if you run it a lot you might use 43.Read factory literature sales people might just want to make a sale.
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Posted By: Brian Jasper co. Ia
Date Posted: 03 Mar 2016 at 12:30pm
Is the thermostat good? I would use the R45 AC plugs over Champion but a cold running engine is going to foul plugs no matter how healthy it is. Get the engine hot. I run a 195 thermostat in the CA along with a Pertronix in the dizzy. It never fouls plugs anymore.
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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
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Posted By: Gerald J.
Date Posted: 03 Mar 2016 at 4:06pm
Champion tractor plugs seem to never clean up after the porcelain gets dirty from burning oil or running rich from being choked to start.They also have an internal series gap to make the coil give higher voltage because the company thinks ALL vintage tractors burn lots of oil. Generally Champion tractor plugs are junk to be avoided.
Gerald J.
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Posted By: Steve in NJ
Date Posted: 04 Mar 2016 at 6:27am
I beg to differ. I think ALL Chimpanze plugs should be avoided! Not just the Tractor plugs... LOL! I know some of the family on here run the Champs with no problems. I was one of those that no matter what I put a Champ in, it didn't last or run well. Change to AC's or Autolites, and engines ran great. WTF?...
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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: Gerald J.
Date Posted: 04 Mar 2016 at 8:30am
I haven't had any experience with Chumps plugs in any engines but tractor engines in a couple decades, so I don't KNOW their other plugs are junk, but I also don't know they are good. Other than the series gap their other plugs probably use the same formula for the porcelain that won't clean and so Steve's evaluation is correct.
Gerald J.
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Posted By: TedBuiskerN.IL.
Date Posted: 04 Mar 2016 at 9:31am
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I have been running J8Cs in all my tractors with few problems. Tried Autolite 303 and 295s and had problems with quality (cracked porcelans) early fouling. Straight AC 45s are no longer available and are the best you can get if you can find some old stock. The R45's are ok with distributor ignition, but should not be used with magnetos I've been told. The resistance is hard on the coils. For putz around tractors AC 46 or 47s don't fouls as easy, but for hard work stay with the 45 heat range. Also using 91 octane ethanol free gas helps a lot, particularly if you have several tractors and they don't get used a lot. Also stabilize your gas with Sta-bil, or Seafoam for storage over a year.
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Most problems can be solved with the proper application of high explosives.
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