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Farmall & IHC Tractors Discussion Forum
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run on

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Andy Schuppert

06-11-2007 18:37:08




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Hi all, I posted a note similar to this a while ago but can't find responses to it. When I kill the ingnition switch by pushing it in my tractor wants to continue running for a while. Sometimes just a couple seconds, other times a minute before it stops. Anyone have a suggestion what I can do to remedy this? Maybe this is normal, I would love to know.
Thanks, Andy




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John M

06-12-2007 16:53:44




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 Re: run on in reply to Andy Schuppert, 06-11-2007 18:37:08  
I can honestly tell you that I have never had a problem with any of my Ms doing that, but what it sounds like to me, is your timing is too far advanced, running too hot of a spark plug, or you have a 12 volt alternator thats not wired up right allowing feedback to the coil. (12 Volt conversion?)



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Andy Schuppert

06-13-2007 03:30:57




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 Re: run on in reply to John M, 06-12-2007 16:53:44  
John, I have found some schematics on the forum and I think I see a problem already. On my alternator I have terminals 1 and 2 connected. I also think they both go positive off the switch in the column box. I know there is no light and I know there is no resistor to present a tiny load. So, if I'm right I can remove terminal 1 and let it float to see what happens and consider this a one wire hook up. Does that sound about right to you. I'll leave 2 as it excites the field and then we'll just see if the old girl stops neat and tidy.

Andy

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Andy Schuppert

06-12-2007 18:26:13




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 Re: run on in reply to John M, 06-12-2007 16:53:44  
John, I posted a reply a while ago and it has yet to show up. Sometimes this site boggles my mind.
I think this is a very real possiblity that my 12 volt conversion was done wrong. I don't suppose you know where a shematic would be for a correct one?

Andy



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jonnny2006

06-12-2007 11:00:21




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 Re: run on in reply to Andy Schuppert, 06-11-2007 18:37:08  
Have you ever herd of dieseling? Well its the same thing. you are not letting the engine cool down for 2 min or longer..... sometimes i know that it is a pain to let it idel for a min or 2 as yesterday i went to someones house and the guy was tring to talk to me... well he was still there as i let it sit for a couple of mins and let it cool. a good practice of this is to shut the fuel off at the bowl and let it idel till it kills at low idle. it takes about a min for the line to run empty plus there is no fuel left to fire on its self. make sure the timimg is not to far advanced and turn off the gas let her run dry and cool off. also i run 90 octaine gas from shell. That is just what the gas guy brings for "farm" fuel. when i run my diesels i only use amoco primer diesel no 2 summer and blend winter. if i still have alot of summer diesel left i will add some kero to it be careful not to add too much though.... some use gas i"m not a big fan of gas in diesel unless it is for starting a fire then i mix it 60/40 as then there is no nasty "flash" to burn your a$$. higher octaine fuel has a higher flash point so that could help also. but they are desinged to run on low octain gas back in the old days. just let her sit and take a moment to think about your next vaccation or somthing else it it only need a couple of mins.

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Nawlens_Gator

06-12-2007 08:30:38




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 Re: run on in reply to Andy Schuppert, 06-11-2007 18:37:08  

One sure fix is to close the gas valve at the filter bowl and let the carb run dry. Then turn off the ignition. I've done this for a while now.



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Hugh MacKay

06-12-2007 03:07:19




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 Re: run on in reply to Andy Schuppert, 06-11-2007 18:37:08  
Andy: Me again, have you ever heard the term, "rode hard and put away wet?" Well it applied to horses, however my dad always said, " feed and brush your horse at the end of the day. take time to give your tractor the same." Heck, all you have to do is stand there, the tractor will warm up or cool down on it's own. However he was also refering to daily checking of fluid levels, most of which have to be done before starting. You can also grease the tractor while it cools off. If nothing better, sit down in the shop and have a cool beer.

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Andy Schuppert

06-12-2007 03:38:12




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 Re: run on in reply to Hugh MacKay, 06-12-2007 03:07:19  
I"ll give it a couple minutes to cool down and it certainly won"t kill me to sit and have a cool beer either. Thanks for all the help.

Andy



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Mark Ollila

06-11-2007 22:03:02




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 Re: run on in reply to Andy Schuppert, 06-11-2007 18:37:08  
Andy, Also, make sure your throttle blade closes properly -- no shaft wear, loose or bent. Even with a good throttle blade, my 1953 Super-M when worked hard, will run-on if I don't let it cool down for about 2 minutes. I've set the low-idle speed to about 425 RPM and made sure the spark timing (battery ignition) is correct for an engine with fire-crater pistons. While applying the choke and engaging the clutch in gear does stop the engine from running on, I'm not a big fan of doing this. The first washes down cylinder bores with unburned fuel and the latter stops piston movement during an uncontrolled combustion event -- both are hard on an engine. Hope this helps. Mark

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Andy Schuppert

06-12-2007 03:43:20




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 Re: run on in reply to Mark Ollila, 06-11-2007 22:03:02  
Thank you all for your help. I think it idles well but I have no idea how to tell how many RPM's it's at. I will ask this... how many degrees can I expect to see on a temp gauge. My original was damaged so I put a regular auto one in. I don't see that barely move above 130 degrees. Now I have to wonder is that defective? Or, do they just run cool?



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Janicholson

06-11-2007 20:45:06




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 Re: run on in reply to Andy Schuppert, 06-11-2007 18:37:08  
Setting the Idle down to spec (or a bit lower), letteing it cool for 2 min running, and using a higher octane fuel all can help. Just put it in 4th and let out the clutch and hold the brakes just as you push in the button. (guaranteed to work) JimN



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CNKS

06-11-2007 19:36:40




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 Re: run on in reply to Andy Schuppert, 06-11-2007 18:37:08  
Usually you can stop that by closing the choke.



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Andy Schuppert

06-11-2007 19:42:05




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 Re: run on in reply to CNKS, 06-11-2007 19:36:40  
So even with all 12 volt supply gone, it can still run on. I'll try the choke trick next time.


Thanks



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Hugh MacKay

06-11-2007 19:19:27




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 Re: run on in reply to Andy Schuppert, 06-11-2007 18:37:08  
Andy: Might help if you gave the model. I have a feeling your shutting it off too quick after heavy work. Most of these old tractors have to idle a few minutes to cool down a bit, particularly true of the thermosyphon models.



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Andy Schuppert

06-11-2007 19:24:05




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 Re: run on in reply to Hugh MacKay, 06-11-2007 19:19:27  
My bad Hugh, sorry.

This is a 1950 M and ya, the more work it's been doing the longer it runs on. So I could just let it sit for a couple minutes and it might be ok?

Andy



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Hugh MacKay

06-11-2007 20:34:23




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 Re: run on in reply to Andy Schuppert, 06-11-2007 19:24:05  
Andy: Tractors from that era, generally were designed for a warm up period before going to work, and a cool down period after work. It wasn't hardto get folks to do this back in the 40s and 50s, as many of them had just graduated from the horse, and you had to feed him before and after work. Then you mix in the fuel injected, electronic ign crowd, they have to be in gear letting clutch out before starter stops turning, and at the end of the day, be in the house before the fan stops.

Don't rule out what John has suggested.

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john cub owner

06-11-2007 19:31:04




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 Re: run on in reply to Andy Schuppert, 06-11-2007 19:24:05  
If it keeps running normally and is by chance a mag, the switch may have dirty contacts internally or a loose wire.



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