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Ford 9N, 2N & 8N Discussion Forum
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Re: Ford 8n ignition issues

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Bruce(VA)

06-29-2020 19:17:39




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These tractors are pretty simple machines; itís usually pretty easy to get them running with some basic troubleshooting steps. You can:

1. Replace every part you can until it starts or you run out of money.

2. List every possible cause of the problem and then randomly pick your favorite to check. It could be your coil. Or your ignition switch. Or about 10 other things.


3. Like diagnosing any other equipment failure, take a step-by-step approach, working from the most likely to the least likely, one system at a time.

Iíve tried all three approaches. The third one always worked for me.

I might not be able to tell you why your tractor isnít running, but I can tell you how to figure it out for yourself.


You could have a spark issue.


You could have a fuel issue.


Donít guess. Troubleshoot. See tip # 13 at the link below.


You need to answer 2 questions before you do anything else:


With the bolt in the carb bowl removed and the gas on, will the fuel flow fill a pint jar in less than 2 minutes?


Next, get out your adjustable gap spark checker * , open the gap to 1/4", hook it up, turn the key on and crank the engine. Does the spark jump 1/4"? Post back with the answers.


And do not buy a new part for the tractor until you can answer this question: how do I know the part on the tractor is defective? Once you narrow the problem to spark or fuel, post back and tell us what you found (and how you found it) and you will get plenty of help to get your tractor running. And tell us if your tractor is 6v or 12v and has a front or side distributor.

* Don't own an adjustable gap spark checker? Buy one! Not a test light! Until then, take an old plug, open the gap 1/4" ground it to the head & look for spark. Itís not the color of the spark that counts; itís the distance it jumps.

https://www.autozone.com/test-scan-and-specialty-tools/ignition-tester/oemtools-adjustable-ignition-spark-tester/10257_0_0?cmpid=PLA:US:EN:AD:NL:1000000:TLS:71700000043798748&gclid=Cj0KCQiAovfvBRCRARIsADEmbRKBdAvAmtFfOvYiYXR7T6NYiW57uyv5-dEKjVT_h2KogQNUUMsRixYaAlU3EALw_wcB&gclsrc=aw.ds

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alaskaguy12

06-29-2020 20:23:21




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 Re: Ford 8n ignition issues in reply to Bruce(VA), 06-29-2020 19:17:39  
I donít have a plug gap checker so I pulled all the plug lines going from the distributor cap to the spark plugs and let them jump to a ground over a 1/4 inch away (The engine block). All were able to make the jump with a nice spark. When the I removed the bolt from the carb the gas flows out at a pretty steady pace. I would say it would qualify as the minimum flow you described (pint jar in under 2 minutes). I also went ahead and check the points to insure they are getting power and they are getting a solid reading from my meter. I also went ahead and checked the engine for compression while I had the plugs out and got a 100psi give or take a few psi out of each cylinder. It is a 6 volt system with a side mount distributor. Prior to the replacements I described I found the original rotator and distributor cap had made contact, breaking the rotor and gouging the points inside the distributor cap which spurred the replacement. Is it possibly a timing issue that was created from when the rotor was having resistance against it?

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Bruce(VA)

06-30-2020 04:20:53




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 Re: Ford 8n ignition issues in reply to alaskaguy12, 06-29-2020 20:23:21  
" Is it possibly a timing issue that was created from when the rotor was having resistance against it? "

No.


" I found the original rotator and distributor cap had made contact"

Why?

Make sure you have the little clip under the rotor.

Make sure you have NO sideways movement in the shaft.

Double check the firing order, 1-2-4-3, CCW

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