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Antique Farm Tractors Vintage farm tractors on rubber tires with various implements. Ford, John Deere, Oliver, McCormick and more.

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Ford 8N saga, Part II - Starts, but won't keep running


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  #1  
Old 08-10-2013, 09:29:09 PM
tirediron tirediron is offline
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Default Ford 8N saga, Part II - Starts, but won't keep running

So, I got the carb issue sorted, and it now sucks up gas just fine. The tractor starts.... BUT... it won't keep running. It runs for between 20 and 60 seconds and then stops; while it is running, it seems to run just fine, sounds good. Once it's stalled out, it'll start right up again, and the same thing... over and over and over. Spraying starter fluid into the carb doesn't seem to make a huge difference so it doesn't really sound like a fuel problem to me.

I've got the timing set pretty close I think, and while it seems fine, but it won't keep running.
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Old 08-10-2013, 09:37:18 PM
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Culy Culy is offline
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Default Re: 8N saga, Part II - Starts, but won't keep running

Does ford tractors have a "no oil pressure" safety shut off gauge on them like our old JD 720. I remember an issue like you have and it was the oil pressure gauge malfunctioning. It would start and run good for 30-60 seconds and shut down. Start right up and repeat the whole scene over and over. Unplug the gauge wiring and ran great so put a new gauge in it and cured it good.
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Old 08-10-2013, 09:49:13 PM
williamgrgn williamgrgn is offline
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Default Re: 8N saga, Part II - Starts, but won't keep running

what year is the 8n and is it 6 volt or 12 volt and pretty sure they don't have a low pressure shut off switch
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Old 08-10-2013, 09:51:20 PM
tirediron tirediron is offline
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Default Re: 8N saga, Part II - Starts, but won't keep running

Hmmm... never heard of anything that sophisticated on an 8N - didn't see it mentioned in the manual, but that doesn't mean much. Hopefully someone knows for sure.

---------- Post added at 06:51 PM ---------- Previous post was at 06:49 PM ----------

Not sure of the year as the s/n is partly obliterated, but it's a 6v, front-mount (old-style) distributor.
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Old 08-10-2013, 10:28:17 PM
Jason W Jason W is offline
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Default Re: 8N saga, Part II - Starts, but won't keep running

Sounds to me like your fuel line is blocked at the tank. It could also be the little resistor under the dash. Mine acted really odd when that went out.
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Old 08-10-2013, 10:56:36 PM
Pat Barrett Pat Barrett is offline
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Default Re: 8N saga, Part II - Starts, but won't keep running

Change the distributor condenser.
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Old 08-10-2013, 11:47:05 PM
tirediron tirediron is offline
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Default Re: 8N saga, Part II - Starts, but won't keep running

Quote:
Originally Posted by Jason W View Post
Sounds to me like your fuel line is blocked at the tank. It could also be the little resistor under the dash. Mine acted really odd when that went out.
Blocked fuel line occurred to me, but what puzzles me about that idea, is that even when put the happy=sniff to it, it still seemed to do the same thing.


Hmmm... I'll be honest, I hadn't even considered the ballast resistor. I'll check that tomorrow.
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Old 08-11-2013, 12:02:20 AM
Brasherman Brasherman is offline
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Default Re: 8N saga, Part II - Starts, but won't keep running

I agree, sounds ignition related if the ether whiff doesn't help. Good luck on the troubleshooting.
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Old 08-11-2013, 12:08:52 AM
tirediron tirediron is offline
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Default Re: 8N saga, Part II - Starts, but won't keep running

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Change the distributor condenser.
It's brand new, as are the points.
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Old 08-11-2013, 08:38:18 AM
Mike Hole Mike Hole is offline
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Default Re: 8N saga, Part II - Starts, but won't keep running

Try this, take a jumper wire with two alligator clips on it and connect one end to each terminal of the ignition ballast resistor.If the tractor stays running your problem has been found.
Its located on the back side of the dash board on the left if your sitting in the seat.It is a small square of black or brown bakalite with what looks kind of like a spring mounted to it and two small wire terminals.
I've replaced many over the years and the symptoms before repair are often like you describe.
You won't do any harm to the system to bypass it for a short time.

Good Luck
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Old 08-11-2013, 03:11:29 PM
tirediron tirediron is offline
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Default Re: 8N saga, Part II - Starts, but won't keep running

T'weren't the ballast resistor at all. Jumpered it out, no change to the symptoms. HOWEVER, start the tractor and keep tapping on the float bowl with a 12" 1/2" extension, guess what... keeps running (at least until my arm got tired enough to stop tapping). Seems that the brand-new needle valve & seat I installed like each other just a little too much.

Does anyone have a source for needle valves without the ****ing Viton tip?
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Old 08-11-2013, 03:19:28 PM
mmcdonald mmcdonald is offline
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Default Re: 8N saga, Part II - Starts, but won't keep running

It's not the Viton tip in itself. The USA float valves we use seem to work fine for a reasonable period of time. Granted I prefer SS myself, but the overseas rubber and the metal machining leave much to be desired. This goes for belts too. Many of these float valves wont work right out of the box and have had many of the belts breaking prematurely. Also check for the float or pin dragging or binding. Not trying to change subject with belts but the crappy rubber made me think of it. Good luck.
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Old 08-11-2013, 03:49:50 PM
tirediron tirediron is offline
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Default Re: 8N saga, Part II - Starts, but won't keep running

Well... either the Viton needle or an improperly machined seat; when I had it apart, and held the upper assembly 'right away up', the float moved freely, but the needle valve would not drop down without a little persuasion.

---------- Post added at 12:49 PM ---------- Previous post was at 12:44 PM ----------

(nb. the float position is correct)
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Old 08-11-2013, 05:47:56 PM
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Craig A Craig A is offline
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Default Re: 8N saga, Part II - Starts, but won't keep running

If the new needle has the viton tip did it come with a tiny, U shaped, clip thingy?
Viton needles are notorious for sticking in the seat....... .......so the little clip is made to engage in a groove in the needle and then hook to the float lever so the lever pulls the needle off the seat.
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Old 08-11-2013, 06:26:10 PM
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Default Re: 8N saga, Part II - Starts, but won't keep running

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Originally Posted by Craig A View Post
If the new needle has the viton tip did it come with a tiny, U shaped, clip thingy?
Viton needles are notorious for sticking in the seat....... .......so the little clip is made to engage in a groove in the needle and then hook to the float lever so the lever pulls the needle off the seat.
D'ohhhh... it's been so long since I've done one of these, I totally forgot about that little clip, and no, it didn't. Time for another call to my buddy at the pars counter!!!
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Old 08-11-2013, 11:34:29 PM
Wayne Riedlinger Wayne Riedlinger is offline
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Default Re: 8N saga, Part II - Starts, but won't keep running

Your float could be set too low or it could be rubbing the inside of the bowl causing it to not "float" very well?.
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Old 08-12-2013, 10:26:55 AM
tirediron tirediron is offline
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Default Re: 8N saga, Part II - Starts, but won't keep running

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Originally Posted by Wayne Riedlinger View Post
Your float could be set too low or it could be rubbing the inside of the bowl causing it to not "float" very well?.
The float level is bang on spec, and it seems to move freely; shaking the carb when it's dry, I don't hear any 'wrong' sounds, but I will double-check that.
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Old 08-18-2013, 09:16:21 AM
rogercsi rogercsi is offline
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Default Re: Ford 8N saga, Part II - Starts, but won't keep running

I have a 8n with a front mount distributor that did the same thing. I replaced the 6v Ford style coil with a remote 12V coil and change it over to a 12v system and had no further issues.
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Old 08-19-2013, 12:00:55 AM
tirediron tirediron is offline
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Default Re: Ford 8N saga, Part II - Starts, but won't keep running

12v conversion would be nice, but it's a sentimental unit and the owner wants to keep it as original as possible.

Solved the problem; the issue was the ****ing Viton tip on the needle valve which kept sticking in the seat and there's no provision for one of those little clips to connect it to the float valve.
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Old 08-27-2013, 02:35:47 PM
dadsshop dadsshop is offline
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Default Re: Ford 8N saga, Part II - Starts, but won't keep running

Try cleaning out the gas tank. You may have junk in there that's blocking the gas.
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