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Farmall & IHC Tractors Discussion Forum
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Can This Be Right?

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Allan in NE

12-19-2005 05:09:52




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Mornin' You Guys!

Hey, my book says to set the plug gap at .025" on the gasser 291/301.

That doesn't sound right to me. That sounds like the plug gap of a lawn mower engine. Shouldn't the plug gap be more like .035"?

Thanks,

Allan




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captaink

12-20-2005 07:04:41




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 Re: Can This Be Right? in reply to Allan in NE, 12-19-2005 05:09:52  
Allen,

I run my M at 0.030. That way it starts easier and idles better. As long as your ignition system is good it won't be a problem until the plugs erode away and that gap gets ot 0.045 or even more :>).

As long as it runs and starts, a wider gap isn't a problem.



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R-cubrd

12-19-2005 08:16:30




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 Re: Can This Be Right? in reply to Allan in NE, 12-19-2005 05:09:52  
I think the wider gaps (up to .050) used on cars are because they have solid state ignition (HEI) which puts out thrice the voltage that the old klunker tractors do. Anything with points generally has lower secondary voltage and so needs closer points. If you rigged up an HEI ignition on your tractor you could go to .050 or more and most likely increase efficiency about 10%.



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Jrry

12-19-2005 08:12:58




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 Re: Can This Be Right? in reply to Allan in NE, 12-19-2005 05:09:52  
Allan, change over to electronic ignition and you can open that gap widder if you like.
later,
Jerry



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Hugh MacKay

12-19-2005 08:02:19




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 Re: Can This Be Right? in reply to Allan in NE, 12-19-2005 05:09:52  
Allan: Just checked IT manual for both C-123 and C-135, plug setting .023. I think all letter series were .023 on plugs and .020 on points.

Can't tell you on 6 cylinder gassers, couldn't afford that luxury.



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the tractor vet

12-19-2005 07:22:54




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 Re: Can This Be Right? in reply to Allan in NE, 12-19-2005 05:09:52  
Yep , thats correct .025 and make sure that your timming is wright on the nose at full throttel and that the dist centrifcal advance is working correctly and use the correct gas in it the 291 is a fussy engine .



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old

12-19-2005 06:20:22




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 Re: Can This Be Right? in reply to Allan in NE, 12-19-2005 05:09:52  
Sounds right to me. Lower compression engines need less gap for the spark then the higher compression engines like in your cars and trucks. Allan just look at how simple tractor engines and lawn mower engines are. Both work about the same way other then one is one or 2 cylinders and most tractors are 4 or 6. Ya I know JDs can be 2 but you get the idea.



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CNKS

12-19-2005 05:52:45




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 Re: Can This Be Right? in reply to Allan in NE, 12-19-2005 05:09:52  
IH Service manual for the 221-301 (mine doesn't list 291) says .023-.028.



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Andy Martin

12-19-2005 05:50:47




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 Re: Can This Be Right? in reply to Allan in NE, 12-19-2005 05:09:52  
It would make one heck of a lawn mower.



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RustyFarmall

12-19-2005 05:50:07




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 Re: Can This Be Right? in reply to Allan in NE, 12-19-2005 05:09:52  
.025 is probably right, must be an IH thing, isn't that gap the same as for an H or M? It does make you think though, when just about everything else just automatically gets set at .035.



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Allan in NE

12-19-2005 06:03:36




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 Re: Can This Be Right? in reply to RustyFarmall, 12-19-2005 05:50:07  
Hi Ya Rusty,

It just seems odd to me; just rechecked the manual and it does indeed say to put 'em at .023". I tested the coil and have got an easy 1 inch spark jump with a nice blue flame.

'Bout a million years ago, when I was working in the tune up department at the Chev garage over in Omaha, we'd pull the things out from .035" to .038 to make 'em idle a little smoother.

Haven't messed with point systems a whole lot since the 70s tho. :>(

Allan

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Nebraska Cowman

12-19-2005 05:36:34




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 Re: Can This Be Right? in reply to Allan in NE, 12-19-2005 05:09:52  
I don't know Allen. I think you want them pinched together pretty good. On my propane tractors I tunk them a little closer than what they come in the package. Don't ever use a gauge.



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