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8n runs 30 MINS gets warm stops starts runs 30SEC

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rodfather

05-03-2006 10:34:01

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Ok, I've read a ton of old posts about this issue and it still isn't clear. My 8N with front mount distrib. Runs about 30 minutes before it quits then it will start repeatedly just fine but only run for decreasing amounts of time until it's 10-30 secs before it quits. It will start to die then pic up then after a couple of those "death throes" it quits. The coil, points, condenser were new last year. I took off the carb a cleaned it. I am assuming an electrical issue here...I took off the distributor and the points are only .010 when open with what feels like a constriction even at that space. Could these be heating up and closing??? I know that would be too simple but I had to ask. Otherwise is this another coil?? Side light: It was nice to clean up the carb as it ran so much better I had to readjust the linkage to get the rpms down. Maybe if I get this other issue resolved I can enjoy an even better running tractor. Thanks in advance for any and all input. rodfather.

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dan hill

05-04-2006 02:17:46

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Re: 8n runs 30 MINS gets warm stops starts runs 30 in reply to rodfather, 05-03-2006 10:34:01

Put the old condenser back in and try it.

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rodfather

05-03-2006 19:15:14

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Re: 8n runs 30 MINS gets warm stops starts runs 30 in reply to rodfather, 05-03-2006 10:34:01

Well, I set the points at .017 just to be safe and replaced the distributor. I removed the float bowl drain plug and got a good stream of gas. I tried to start my tractor and ...zippo! Nothing!! I removed a plug and looked for a spark while trying to start her..NO spark at all! I removed the wires from the key on off and connected them together [they were "live"] and tried again to start...NO spark at all. So, now what? buy some new parts? Did my coil, if that's the problem, just finally give up totally? Did I screw up things with my distributor work? I have now made things worse than they were... ugh!

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old

05-03-2006 12:14:14

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Re: 8n runs 30 MINS gets warm stops starts runs 30 in reply to rodfather, 05-03-2006 10:34:01

Well first off the points are set wrong. They need to be set at .015. When it quits what does the spark look like?? If its a nice blue spark you probably have fuel problems and need to check the filters. If the spark is a yellow color then you have spark problems and you will need to trouble shoot where the spark gets lost. I would start by hot wireing it. If it then runs right the problem is from the coil back to the ignition switch. If it still does the same thing when hot wires you problem is the coil and or the distubutor area.

Hobby farm

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8N'r

05-03-2006 11:06:44

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Re: 8n runs 30 MINS gets warm stops starts runs 30 in reply to rodfather, 05-03-2006 10:34:01

Rodfather--here some helpers taken from one of Dell's posts..... ...there are 4-common runtime issues with frontmount ignition systems. 1) runs for about 1 minute and quits; bad condenser, not yer stated problem
2) runs for about 5 minutes and quits; clogged fuel filters, not yer stated problem
3) runs for about 15 minutes and quits; gunked up ignition switch, could be yer problem
4) runs for about 1 hr and quits; melted insulative tars and shorted coil, "cures" itself overnite, could be yer problem

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roger '40 9n

05-03-2006 11:04:56

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Re: 8n runs 30 MINS gets warm stops starts runs 30 in reply to rodfather, 05-03-2006 10:34:01

Could be an electrical problem. Try this: Next time have an old sparkplug with you. When it dies take off one of your sparkie wires and put it on the old plug. Lay it on the head and try to start the engine. iffn it sparks you have a fuel problem if not a spark problem. Also try jumpering the ignition switch. They get hot and crap out. They can cool off in a minute and work for a few seconds.

Did you check all three fuel filters? Are you getting a good flow of gas outa the drain plug hole at the bottom of the carb. Testing fuel flow at the carb inlet will not check for stuck float or clogged up inlet strainer.

Roger in Michigan

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OH Boy

05-03-2006 10:40:32

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Re: 8n runs 30 MINS gets warm stops starts runs 30 in reply to rodfather, 05-03-2006 10:34:01

Sounds like fuel flow is restricted. Have you cleaned all the screens out?

There are three, one at the top of the fuel shut off valve, another in the sediment bowl, and another still in/under the elbow fitting at the carb.

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rodfather

05-03-2006 12:29:14

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Re: 8n runs 30 MINS gets warm stops starts runs 30 in reply to OH Boy, 05-03-2006 10:40:32

I checked the filter at the elbow in the carb. when I cleanded that up but not the other two. I was assuming [always a mistake, I know] that the initial 30 minutes of run time after she cools down precluded the possablity of it being fuel?? Do I need to drain the new 10 gals of gas to clean the upper two filters?? thanks. rodfatherjr

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OH Boy

05-03-2006 13:03:14

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Re: 8n runs 30 MINS gets warm stops starts runs 30 in reply to rodfather, 05-03-2006 12:29:14

You can check the screen in the sediment bowl easily enough.

Before you drain the fuel from the tank to check the other one, first check the fuel flow by disconnecting fuel line from carb and then let it flow (catch it in a jar or something) for a few minutes and see if that is the problem. If it keeps on flowing, then you have eliminated the upper screen as the problem.

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Dell (WA)

05-03-2006 13:01:46

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Re: 8n runs 30 MINS gets warm stops starts runs 30 in reply to rodfather, 05-03-2006 12:29:14

Rod..... ...just turn yer undertank fuel valve OFF, to clean the fuelfilter screen on-top yer glass fule sight bowl. Simple, eh?

While the cylindrical screen filter that sets up inside the fuel tank is cleaned by removing the fuel valve (empty gastank first) and it frequently "melts" so that you haffta replace the intire fuelvalve ($20, cheap); that ain'chur problem.

Yer runtime has all the characteristics of BAD IGNITION SWITCH. ($10, cheap)

Heres the deal, the internal switch contacts gitt gunked up and heat-up and start reducing yer sparkies making yer engine ruff-runnin' and quits. Usually, takes about 15-mins to make it hard runnin' and difficulting restarting. Cools off innna'bout 30-mins and then restarts..... ....Dell, yer self-appointed sparkie-meister

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Bob Jones

05-03-2006 12:57:02

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Re: 8n runs 30 MINS gets warm stops starts runs 30 in reply to rodfather, 05-03-2006 12:29:14

I think your problem is primarily points. I experienced similar point problems with my 9n until I finally set them at about .018 even though the book says .015. At the closer distance the points kept developing a small (tit) which would end up grounding out the points. I think this was due to a lot of wear in my distributor. However after I converted to 12 volts last year I haven't had any fire problems since. Good Luck.

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rodfather

05-03-2006 19:34:31

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Re: 8n runs 30 MINS gets warm stops starts runs 30 in reply to Bob Jones, 05-03-2006 12:57:02

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Phil (Nj,Az,Sask)

05-04-2006 07:58:10

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Re: 8n runs 30 MINS gets warm stops starts runs 30 in reply to rodfather, 05-03-2006 19:34:31

Go back and make sure the coil pigtail is making contact in the Dist with the concave screw...

Setting the points Gap to >.015 is counter productive (front mount is a designed dwell). Check the gap on all 4 lobes.

When you install the Dist Cap make sure the Rotor is at 6 Oclock; such that the rotor Spring
is compressed when you push cap in and up.

Hope this Helps,

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Bob Jones

05-04-2006 03:43:46

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Re: 8n runs 30 MINS gets warm stops starts runs 30 in reply to rodfather, 05-03-2006 19:34:31

Did you see the ignition switch description of problem Dell mentioned. I recommend emailing Dell or discussing it further here with him. He is an electrical wizard on these fine tractors. When it gets too frustrating just take a break and come back later. Good Luck.

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