IH Forever Posted May 30, 2022 Share Posted May 30, 2022 I know it’s been hashed out here several times but I didn’t have much luck with the search feature. My ‘41 H needs to be tuned up. Have always used Champion D15 plugs but I know some say there is much better quality available. I believe Autolite plugs have been recommended? Can anyone give me specifics? This tractor rarely gets used. Has a 110 mid-mount mower on it and we occasionally use it to mow the road sides on gravel roads. But it never really gets worked hard. Quote Link to comment Share on other sites More sharing options...
Farmall Doctor Posted May 30, 2022 Share Posted May 30, 2022 Autolite 3116 gapped at .023" They are the best because they are a non-resistor type plug. It is the resistors that burn out inside and cause the plug to stop sparking even though they are not fouled. 2 1 Quote Link to comment Share on other sites More sharing options...
IH Forever Posted May 30, 2022 Author Share Posted May 30, 2022 16 minutes ago, Farmall Doctor said: Autolite 3116 gapped at .023" They are the best because they are a non-resistor type plug. It is the resistors that burn out inside and cause the plug to stop sparking even though they are not fouled. Thank you sir. Quote Link to comment Share on other sites More sharing options...
660 driver Posted May 30, 2022 Share Posted May 30, 2022 I vote autolites as well. Ive had champions break the tang the elctrode arcs too. Plug had maybe 500 miles on it. Quote Link to comment Share on other sites More sharing options...
Phelpst Posted May 30, 2022 Share Posted May 30, 2022 We use the 3116 autolite or Ngk ab6 and never have any trouble. Quote Link to comment Share on other sites More sharing options...
cgage Posted June 1, 2022 Share Posted June 1, 2022 Agreed, I went to Autolite 3116 in my H, M, and W-4 and they run the best on those Quote Link to comment Share on other sites More sharing options...
rustred Posted June 1, 2022 Share Posted June 1, 2022 champion D16 is all these old tractors had in them in including other makes also. nothing wrong with their plugs and i use them before any other plug. autolite is a lighter made plug and will break off if it gets seized in the threads, i know had it happen. and compared it to champion and champion had more meat on it and it would have never broke. tell me how can u tell the difference between plug brands on a running engine ?? this is my specific's from experience. Quote Link to comment Share on other sites More sharing options...
nepoweshiekfarmalls Posted June 1, 2022 Share Posted June 1, 2022 My tractors will not run on today's Champion spark plugs. 1 Quote Link to comment Share on other sites More sharing options...
Farmall Doctor Posted June 1, 2022 Share Posted June 1, 2022 17 hours ago, rustred said: tell me how can u tell the difference between plug brands on a running engine ?? ...Because they don't run.. or don't run long on champions. I don't know how many times I have had a tractor brought in that won't run right. "we just changed the plugs, and it's just not right"... put some Autolites in and away it goes. AC C-87 plugs were quite good for a long time until they changed something in them... perhaps country of origin. Quote Link to comment Share on other sites More sharing options...
MacAR Posted June 2, 2022 Share Posted June 2, 2022 I use delco C87's in my 300, 340, and Cub. Have had zero issues with them to date. Did have an issue with them in a B John Deere however. Went to 3116 plugs and had no more trouble. I'd get a set of both and try them, they're cheap enough. Mac Quote Link to comment Share on other sites More sharing options...
nepoweshiekfarmalls Posted June 2, 2022 Share Posted June 2, 2022 18 hours ago, Farmall Doctor said: ...Because they don't run.. or don't run long on champions. I don't know how many times I have had a tractor brought in that won't run right. "we just changed the plugs, and it's just not right"... put some Autolites in and away it goes. AC C-87 plugs were quite good for a long time until they changed something in them... perhaps country of origin. A while back a good friend and I went on a tractor ride together. He met me out at my place. We went to load them up and the M he drives was running rough. I told him that a new set of plugs would cure it. He was skeptical. I proceeded to remove the champion plugs and replace them with 3116 Autolite. It started and ran flawless. He was a believer then! 1 Quote Link to comment Share on other sites More sharing options...
IH Forever Posted June 2, 2022 Author Share Posted June 2, 2022 I've always used the Champions as that's what Dad always has on hand in his shop. (Much cheaper when I just grab 4 of his.😄) But Saturday when we got it running and out of the shed I told him I wanted to try something different, I don't think think the Champions are the same quality as they were 30 years ago when he actually put a lot of hours on the gas tractors in the field. I went to the local Napa store today but he didn't have any as he says he doesn't stock Autolite plugs. He's a great guy to work with and said he would order 4 and have them for me tomorrow, so I will give them a shot. Tractor is probably lucky to run 5-10 hours/year so not sure I can really give it a good test. Quote Link to comment Share on other sites More sharing options...
Martin Thompson Posted June 7, 2022 Share Posted June 7, 2022 I have Autolite 3116 in a couple of tractors and Champion D21 in a couple of others. I used to use Champion D16 plugs but they often would fowl if the tractor was not working hard (usually half way through a parade while everyone was watching) so tried a hotter plug and so far no problems. Marty,NZ Quote Link to comment Share on other sites More sharing options...
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