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Odd Problem


 
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Smokeys427
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Joined: 06 May 2007
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Location: Wills Point TX

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PostPosted: Sun Jul 01, 2007 8:58 pm    Post subject: Odd Problem Reply to specific post Reply with quote

My 8N is running great and not a flutter at all. I have also changed all three filters and also replaced the ignition switch and it runs fantastic and never has the dying problems it once did when I first got it.
Now after I'm out bush whacking and I need to shut it off for any reason it will not restart.
Got aggravated at it as she had good spark and plenty of fuel. Went ahead and pull started her and she popped right off and went bush hogging for another few hours without incident at all. Even pulled great through tall weeds and grass.
So I pulled her in the barn shut her off and tried again just to see if she'll start. She just cranked and cranked and never started. Went out about three hours later and she started right up. By this time I was confused and scratching my head. :( :?
Man, she has fire, she has gas and air, and starter spins fine. But just won't start. It only seems to do this hot at operation temps.
Any idea's from you 8N guru's to were to start looking? :?
By the way pulled the plugs and there nice and light brown just like the should be. Could the coil be heating up and cause this?
Thanks in advance
 
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Bob
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PostPosted: Sun Jul 01, 2007 10:06 pm    Post subject: Re: Odd Problem Reply to specific post Reply with quote

Most likely, it IS the coil getting weak when it's hot.

When the starter is cranking the engine, the battery voltage pulls down, making the already-weak spark even weaker.
 
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Bill(NC)
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PostPosted: Mon Jul 02, 2007 3:03 am    Post subject: Re: Odd Problem Reply to specific post Reply with quote

Could be a weak battery.
 
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Bruce (VA)
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PostPosted: Mon Jul 02, 2007 4:22 am    Post subject: Re: Odd Problem Reply to specific post Reply with quote

You didn't say if this is a 6v or 12v, front or side distributor. That might make a difference in solving this problem. What is it? When it refuses to start, have you checked for spark and fuel? Pull any plug, ground it to a clean paint & rust free spot on the head, turn the key on & crank it. Got spark? If so, what does it look like? As a good rule of thumb, a 1 - 2 minute run times is usually the condenser, ballast resistor, or vacuum lock....or, failure to turn the gas on. A 5 minute run time is usually fuel screens. A 15 minute run time is usually the ignition switch. A one hour run time & then restarts after it cools down is usually the coil. Sooooo, I'm thinking coil.
 
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john h
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PostPosted: Mon Jul 02, 2007 4:23 am    Post subject: Re: Odd Problem Reply to specific post Reply with quote

it sound like you have mess up carb. something in the main jet blocking or got wreck mainjet and you need to repair it. try a rebuild kit
I ended up replace my carb because I had mess it up so bad and now it dont cutout, Don't stop, don't run out fuel, don't have spray wd40 as started fluid carb to . it start right up
 
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Smokeys427
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PostPosted: Mon Jul 02, 2007 6:55 am    Post subject: Re: Odd Problem Reply to specific post Reply with quote

Bruce (VA) wrote:
(quoted from post at 05:22:28 07/02/07) You didn't say if this is a 6v or 12v, front or side distributor. That might make a difference in solving this problem. What is it? When it refuses to start, have you checked for spark and fuel? Pull any plug, ground it to a clean paint & rust free spot on the head, turn the key on & crank it. Got spark? If so, what does it look like? As a good rule of thumb, a 1 - 2 minute run times is usually the condenser, ballast resistor, or vacuum lock....or, failure to turn the gas on. A 5 minute run time is usually fuel screens. A 15 minute run time is usually the ignition switch. A one hour run time & then restarts after it cools down is usually the coil. Sooooo, I'm thinking coil.


Sorry about that. I have a 1948 8N with a front mount dizzy. It's also been converted to a 12 volt system. Battery great and spins the starter great. Seems to have good spark.
But I think were on the same page with the coil. Now I have a new uninstalled 12 volt coil. But, would this tractor still have the six volt dizzy in it or would it have to have the 12 since it's been converted. Now it does have the cramatic looking resister in the system if that helps you all letting me know anything
Thanks again for the help. :D
 
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Bruce (VA)
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PostPosted: Mon Jul 02, 2007 7:16 am    Post subject: Re: Odd Problem Reply to specific post Reply with quote

First off, how do you know it has a good spark? If you didn't pull a plug & look, there is no way to be sure. Secondly, now that we know you have a 12v conversion & unknown resistors in the circuit, your problem is likely resolved. You have probably burned up the coil because of incorrect resistance in the ignition circuit. There are about 6 ways to correctly convert an N to 12v & an infinite number of ways to do it wrong. Until you can tell us how it is wired, we will not be much help to you in getting it fixed. Check out this article in the N-News by SouNdguy.

http://www.n-news.com/specialads1.html

Then, re-post with what you have and you will get plenty of help. Otherwise, you are going to get a lot of guesses!
 
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Smokeys427
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PostPosted: Mon Jul 02, 2007 8:13 am    Post subject: Re: Odd Problem Reply to specific post Reply with quote

Bruce (VA) wrote:
(quoted from post at 08:16:10 07/02/07) First off, how do you know it has a good spark? If you didn't pull a plug & look, there is no way to be sure. Secondly, now that we know you have a 12v conversion & unknown resistors in the circuit, your problem is likely resolved. You have probably burned up the coil because of incorrect resistance in the ignition circuit. There are about 6 ways to correctly convert an N to 12v & an infinite number of ways to do it wrong. Until you can tell us how it is wired, we will not be much help to you in getting it fixed. Check out this article in the N-News by SouNdguy.

http://www.n-news.com/specialads1.html

Then, re-post with what you have and you will get plenty of help. Otherwise, you are going to get a lot of guesses!


Quote:
First off, how do you know it has a good spark?

simple I pulled a plug wire off and grounded it and had what seemed to be good spark. Second pulled a plug and grounded the plug and had spark.
Now, back to the resister. To test this would I test it on one side and have 12 volts and then the other and if it has 6 volts, Would that tell me that I haved a six volt coil? I do know that it's not the one wire convertion as it has both wires hooked to the alternator at both spade connectors (internal regulator).
As for really how it's wired I hope that I'm not going to have to pull the whole wiring system out. That's what i'm trying to avoid and hope by testing this some way I can diagnose her this way.
Thanks Bruce for all you help her :wink:
 
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Bruce (VA)
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PostPosted: Mon Jul 02, 2007 9:25 am    Post subject: Re: Odd Problem Reply to specific post Reply with quote

No, you tell a 6v coil from a 12v coil by it's internal resistance. Measure between the top terminal and the pigtail on the bottom. A 6v coil should be around 1 to 1.5 ohms. The 12v coil should be about 3 to 3.5 ohms. Once you determine which coil you have, the article I sent you from SouNdguy will help you figure out which resistors you need in-line to the coil.
 
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