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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

My 8N runs rough after warm up.

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Robert G. Miller

01-23-2013 13:46:46
184.157.29.200



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My 8n runs rough after warm up. Ive replaced all ignition parts and rebuilt Carb in hopes of fixing the problem. After it cools down completly it will run. If it has not cooled down it will spit and sputter after you put it in gear and try and move tractor. It will always start right up put wont take a load on engine unless you let engine cool down then runs fine until warm up.




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russb wa

01-24-2013 14:56:15
67.185.6.72



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 Re: My 8N runs rough after warm up. in reply to Robert G. Miller, 01-23-2013 13:46:46  
Sure sounds like a coil. But, it could be that it is not getting enough voltage once the (balast?) resistor warms up (12 volts). You might want to jumper around the resistor after it warms up.

Would it technically be a bad coil just because it requires a bit more voltage? I don't know.

Then again maybe you don't have a ballast resistor in the circuit at all.



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Bill Rowles

01-24-2013 09:25:15
76.2.232.2



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 Re: My 8N runs rough after warm up. in reply to Robert G. Miller, 01-23-2013 13:46:46  
When did this behavior start? Is it possible the muffler is the problem stopping gas flow when hot? Did it run like this before converting electric system to 12V? If you pull out choke a little when it "spits & sputters" does it run better? Have valves been ground or adjusted just before this behavior started?



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Robert G.Miller

01-24-2013 12:09:46
207.119.180.7



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 Re: My 8N runs rough after warm up. in reply to Bill Rowles, 01-24-2013 09:25:15  
It has always been a 12 volt system since I have owned it. I will try a new coil. Maybe the one I bought was bad.



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Dell (WA)

01-23-2013 18:49:17
71.212.40.136



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 Re: My 8N runs rough after warm up. in reply to Robert G. Miller, 01-23-2013 13:46:46  
RGM..........there are 4-common runtime issues with the weird 4-nipple front mount dizzy.....
1) runs fer about 1-min and quits; restarts inna'bout 5-mins; BAD condenser, NOT yer problem
2) runs fer about 5-mins and quit; restars inna'bout 5-mins; CLOGGED in the tank fuel filter, NOT yer problem
3) runs fer about 15-mins and quits; restarts inna'bout 30-mins; BAD weaksister ignition switch, NOT yer problem as stated but could be
4) runs fer about 1-hr and quits; restarts after about 4-hrs of cool down time. Sound like yer problem??? BAD squarecan ignition coil. Unfortunately, once the insulative tar melts, it will always melt inna'bout 1-hr. Time fer NEW COIL. .......Dell, yer self-appointed sparkie-meister

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old

01-23-2013 20:55:21
209.86.226.56



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 Re: My 8N runs rough after warm up. in reply to Dell (WA), 01-23-2013 18:49:17  
Ah but Dell if you read all of his posts he done did the new coil thing and that did not fix his problem. Sorry I do respect your posts but some times you do need to read all that has been said. I to asked about the coil and he answered me with it was new. Yes could be a bad new coil form the land of almost right which could well answer it all



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Robert G. Miller

01-23-2013 16:28:39
184.157.29.200



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 Re: My 8N runs rough after warm up. in reply to Robert G. Miller, 01-23-2013 13:46:46  
Its a 12 volt front mount. I don't remember the gap off the top of my head, but i did it according to specks. I have done some reading on others with this problem. I am beginning to wonder if its in the head like you mentioned. What do I do to check the head?



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old

01-23-2013 17:37:55
209.86.226.59



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 Re: My 8N runs rough after warm up. in reply to Robert G. Miller, 01-23-2013 16:28:39  
So then front mount so did you try another coil on it?? If it runs ok for say 45 minutes then starts to cause problems good chance it is the coil going bad



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Robert G. Miller

01-23-2013 18:00:15
184.157.29.200



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 Re: My 8N runs rough after warm up. in reply to old, 01-23-2013 17:37:55  
Yes a new coil still after 15min it runs rough under load ( in gear) until cool down.



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old

01-23-2013 18:17:33
209.86.226.59



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 Re: My 8N runs rough after warm up. in reply to Robert G. Miller, 01-23-2013 18:00:15  
Do you have a propane torch?? If you do when it starts running bad take that torch and wave it around the manifold area. DO NOT light it. It it smooths out when you do that good chance you have a bad manifold gasket. Also check you spark when it starts doing that and make sure you have a good blue/white spark that jumps a 1/4 inch gap or more



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Bruce (VA)

01-23-2013 16:44:25
24.125.80.178



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 Re: My 8N runs rough after warm up. in reply to Robert G. Miller, 01-23-2013 16:28:39  
" What do I do to check the head? "

Rather than jump on a possible but seldom seen problem, you would be better off checking the simple & more likely possibilities.

Like firing order & timing.

did you set the timing on it?



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Robert G. Miller

01-23-2013 17:58:47
184.157.29.200



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 Re: My 8N runs rough after warm up. in reply to Bruce (VA), 01-23-2013 16:44:25  
Firing order and timing is correct.



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old

01-23-2013 15:51:58
209.86.226.61



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 Re: My 8N runs rough after warm up. in reply to Robert G. Miller, 01-23-2013 13:46:46  
More info would help us help you better. Could be a coil going bad or a manifold leak or even the valves needing to be adjusted because as the engine gets hot the tappet gap could be closing up causing it to not run well because valves are not closing as they should



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Bruce (VA)

01-23-2013 14:38:55
24.125.80.178



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 Re: My 8N runs rough after warm up. in reply to Robert G. Miller, 01-23-2013 13:46:46  
6v or 12v? Front or side distributor?

W/ all those new parts, did you set the timing?

What did you set the point gap at?

Did you double check the firing order & plug wires? (1-2-4-3, CCW)



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