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Ford 9N, 2N & 8N Discussion Forum
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BOB/DELL/et al

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ron tron

09-29-2006 14:27:26




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Bob thanks for the suggestion but I have to ask you..... ....Could it be a bad coil? I ran the 12 volt coil I got with the 12 volt conversion kit without a ballist for a while..... ..with the 2.5 ohm coil Pertronix said it didn't need a ceramic resistor..... ..After about 20 or so hours without the ceramic resistor was when I first noticed it dying after running for 45 minutes to an hour. I put in the ceramic resistor and it still died after running but dealt with it until it started running shity all the tima and thats when I started rebuilding the carb.....and the only help that has been is now its back to where it was..... ....
I thought it could have fried the coil but my son in law (who I said before has 5 mechanics working for him and has been in the biz since he got out of high school) said a coil WORKS or DOESN'T work
..... not work and then quit after 45 minutes which brings me to a problem with your suggestion
of sitting on my duff for 45 minutes waiting for it to quit, because I can't do any work on three cylinders..... ...there has to be a easier way t check if the spark is getting weak.

I have the old 6 volt coil. will it work with the ceramic resistor and 12 volt conversion system with the pertronix unit to see if its the coil?.

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dave guest

10-02-2006 21:13:55




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 Re: BOB/DELL/et al in reply to ron tron, 09-29-2006 14:27:26  
Coils would heat up and fail long as I can remember. Even with 6 volts systems in the 50's. Almost any electrical part can be intermittently bad, cept maybe a fuse!



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Phil (NJ,AZ,Sask)

09-30-2006 07:37:37




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 Re: BOB/DELL/et al in reply to ron tron, 09-29-2006 14:27:26  
[quote]I have the old 6 volt coil. will it work with the ceramic resistor and 12 volt conversion system with the pertronix unit to see if its the coil?.[/quote]

Ron Tron, The 6 volt coil is ~1.0 Ohm and requires additional resistance. If you just want to TEST you tractor "running" add a RU10 which is 1.8 ohms to your existing "Ceramic" RESISTOR. What is that Resistor???

The Pertronix system, itself, doesn't care what resistor or coil is used as it only replaces the points and has a high/higher current rating. It may also control dwell such that the MAX current time is minimized.

If you want to use the 6 volt coil full time. I have tested 2 ea OEM type ballast Resistors (PLUS)an ICR23. The math is COIL=1.0 ohm, Ballast#1 = 1.5 ohm, Ballast#2 =1.5 ohm, Icr23=1.2 ohm. The total is 5.2 ohms running @ 14.5 volts or ~2.8 AMPS

Still think your problem is fuel but elimination may revel more than 2 problems.

JMHO

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Jim West TN

09-30-2006 05:29:02




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 Re: BOB/DELL/et al in reply to ron tron, 09-29-2006 14:27:26  
Ron,
As a few have mentioned son-in-law is deficient in electrical knowledge. You have classic symtoms for bad coil or ignition switch. A couple of other ways to check are with a clamp on ammeter. Take your readings on the plug wires when it is good at the start and compare with the readings when it begins to run badly. The plugs with weak spark will have smaller readings. The other way is to use a timing light on the different plug wires. The plug should fire every time, you should be able to see the ones that only fire intermittantly. When you start the tractor jumper the ingition switch, I use a medium size clamp on paper clip. If it continues to run good after an hour or two you have a bad ignition switch, If it starts running crapply you are looking at a bad coil. Gool Luck,
Jim

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souNdguy

09-29-2006 21:52:44




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 Re: BOB/DELL/et al in reply to ron tron, 09-29-2006 14:27:26  
It's apparent that your son supervising the 5 mechanics doesn't have all the electrical theory down yet.. . whether he's done it 20 ys or not. ( no biggy.. nobody knows everything.. ) Thermal breakdown can happen in many components.

It's well documented how it happens..and why etc.

soundguy



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southpaw

09-29-2006 16:27:40




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 Re: BOB/DELL/et al in reply to ron tron, 09-29-2006 14:27:26  
Ron,
If you want to read how an ignition can go soft type 'shorted ignition coil winding' in Google and hit search. What Jack said...
Your 6 volt coil won't work well if at all. Having never cut one open I would guess it has more windings than the 12v coil. And I dunno what that would do to your condenser, points, etc.
Are you saying you ran it without the resistor from day one after converting to 12v?
Or did you pull the resistor after changing out the coil and then 20 hours later it started acting up?
Also you don't need to run it on three cylinders to test for spark. Since it has to sit for awhile after it acts up before it'll work again you have time to pull the plug and check for spark.
If it was me I'd pull the plug and check the spark when it was running well. I'd try to remember the intensity of the little blue light. Hopefully I'd be able to tell the difference once it started running rough. Good luck!

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duey

09-29-2006 20:08:08




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 Pertronix in reply to southpaw, 09-29-2006 16:27:40  
South, in Ron's previous post, he indicated they had put electronic ignition stuff in. I get the gist of the posts on EI that the system doesn't work with a resistor in circuit...

But there shouldn't be points/condensor there now.

I still think, as I mentioned below, that the tank venting is suspect. With a full tank, the stall time would be soon, an low tank will take longer.... & it is super easy to eliminate that possibility. duey

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Southpaw

09-30-2006 08:10:16




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 Re: Pertronix in reply to duey, 09-29-2006 20:08:08  
Thanks Duey. Silly me. I didn't know the Pertronix was EI. In that case wouldn't any good coil - rated at a high enough voltage - work? Maybe just not as well as the low resistance coil?



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duey

09-30-2006 10:09:32




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 Re: Pertronix in reply to Southpaw, 09-30-2006 08:10:16  
I don't have any experience with EI... only what can be read here in the posts.... sorry.. duey



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Jack-Illinois

09-29-2006 16:01:30




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 Re: BOB/DELL/et al in reply to ron tron, 09-29-2006 14:27:26  
In my opinion, yes it could be the coil. It could also be other things that you have been checking. A coil can change it's output voltage by turns of wire inside of it shorting together as it heats up. They often clear the short between them as the coil cools back down. No magic to it, just simple expanding with heat and shrinkage with cool down. Sorry, but I don't want your son-in-law working on my stuff!!

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fuel vent..John,PA

09-29-2006 14:43:25




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 Re: BOB/DELL/et al in reply to ron tron, 09-29-2006 14:27:26  
Make sure the small hole is open on the top of the tank. Might try again by letting the fuel cap loose. If this works, then it is the fuel tank vent for sure. HTH John,PA



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