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Subject: coil and distributor

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Jessie Peterson    Posted 11-28-2019 at 20:52:41 [URL] [DELETE]        [Reply] [Email]  
  • coil and distributor
  • Just acquired a 1948 N that has been converted to 12 volt system. I need to replace the distributor due to a crack. If I find the coil bad can I use a 12 volt coil on the given distributor ? not sure if its 6 or 12 volt ...how do I tell and can I use either coil?

    Tim Daley(MI)    Posted 11-29-2019 at 06:15:26 [URL] [DELETE]        [Reply] [No Email]  
  • Re: coil and distributor
  • FORD N FRONT MOUNT DISTRIBUTOR INFO

    Welcome aboard the NTC! You came to the right place. Don’t buy any new parts just yet –you need to determine if the old can be rebuilt or fixed. Did you ‘convert’ to 12V or was already attempted? You say your distributor is cracked. Where? Did you or the previous owner mount the front distributor wrong? If it is 180° off, the offset tang on the front mount distributor isn't set correctly on the engine mounting surface, so yeah, it's 180° off but it will not bolt down flush and you will crack the distributor base the first time you try and fire it up, trust me SEE PICTURE. When that happens the base is junk as it can’t be used or fixed. Get the essential manuals and read, read, read. Know how to set the timing correctly. Gap is .015” +/- .001” and buy quality parts –SEE FARMER DAN HOWE for more info. Dan also has OEM rebuilt correctly units ready to go so if you need a new one, he can set you up and no need to buy a newer Cheena made POS.

    You can static test a front mount square can coil easily. Take your 6V coil off and set your VOM to OHMS. Place one probe on the pigtail wire and the other probe (polarity unimportant) on the top terminal post. Your 6V coil should read about 3.2 OHMS +/-. A 12V coil will be more, about double.

    Incorrect wiring is 99% of most non-starting issues whether 6V/POS GRN or 12V/NEG GRN. Just because you have a 12V battery does not ensure you have it wired correctly. The same is true with a 6V battery. Don’t assume – verify with confirmed actual data. Go to the NTC HOW-TO’s forum under ELECTRICAL and search for wiring pictograms by JMOR. Then you can figure out if you want to stay with 6V or use 12V. If you have a 12V, are the generator and voltage regulator removed and an alternator installed? Do you have the OEM Ballast Resistor in place and wired correctly? You need it on both the 6V and the 12V setups. If using a 6V coil, you will need an external ceramic 1-OHM resistor in line. If you have a 12V coil there is no need for any external resistor.

    Get the manuals. Get the wiring pictograms. Get 75 Tips For N-Owners by Bruce(VA). Test coil. Verify wiring is correct. Verify distributor isn’t cracked as shown at tangs. Verify distributor timing is set correctly. Test unit before mounting. Mount distributor correctly. Test unit before firing up tractor. Follow these measures and I promise you will have a good running tractor. Get the electrical right first, then you can work on the fuel test.

    FORD FRONT MOUNT DISTRIBUTOR – WHAT HAPPENS WHEN MOUNTED 180° OFF:


    FORD 8N TRACTOR ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS:

    Tim Daley(MI)

    Bruce Haynes    Posted 11-29-2019 at 07:16:07 [URL] [DELETE]        [Reply] [Email]  
  • Re: coil and distributor
  • " " You can static test a front mount square can coil easily. Take your 6V coil off and set your VOM to OHMS. Place one probe on the pigtail wire and the other probe (polarity unimportant) on the top terminal post. Your 6V coil should read about 3.2 OHMS +/-. A 12V coil will be more, about double. "

    You must have a fat finger this morning.

    I've never seen a 6v front coil at 3.2 ohms.....and never a 12v at 6.4.

    The OEM Ford script 6v coil spec'd at 0.470 to 0.510 ohms .

    New ones are usually 1.5 or so and seldom do the 12v coils get to more than 2.5. Hence the need for the oem ballast resistor.

    TPD    Posted 11-29-2019 at 10:04:18 [URL] [DELETE]        [Reply] [No Email]  
  • Re: coil and distributor
  • OOOPPPSSS... read data wrong. waiting on new glasses this week.


    TPD

    Farmer Dan    Posted 11-29-2019 at 03:49:48 [URL] [DELETE]        [Reply] [Email]  
  • Re: coil and distributor
  • The distributor does not care if its 6 or 12 volt.

    Jessie Peterson    Posted 11-29-2019 at 07:28:02 [URL] [DELETE]        [Reply] [Email]  
  • Re: coil and distributor
  • Thanks guys for the responses. I thought the distributor wouldn't make a difference but I am use to Diesel tractors and somewhat newer ones.My stepfather told me that (Just8n's) did the conversion and he (stepfather) may have put it back together wrong after troubleshooting a hard start a time later. The pic sent of the crack looks about right for what may have happen. Anyway looking forward to exploring and restoring !

    Den N Ms    Posted 11-28-2019 at 23:00:54 [URL] [DELETE]        [Reply] [No Email]  
  • Re: coil and distributor
  • Jessie,Just get a 12 volt front mount coil and get or use a OEM ballast resister on it that is all you will need.Ceramic or other resisters not! needed.

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