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8 volt 8N won't run under load

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Will

12-19-2002 08:29:53




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On Monday I picked up an early 8N that hasn't run in years, my brother in law helped me unload it and push it off the drive way. I put a new 8 volt battery in it, drained the bad gas and managed to get it running, albeit roughly, yesterday afternoon. When I try to put it into gear it dies. Time and weather permitting this afternoon I'll change the plugs. I really want to get it running good enough to get it under cover so I can work on it in a little more comfort. I'm assuming this tractor has some sort of 8V regulator or reducer because a 6V battery would just barely turn it over while the 8V gives the starter a good crank.
Any ideas much appreciated.

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Rich, NJ

12-20-2002 03:27:50




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 Re: 8 volt 8N won't run under load in reply to Will, 12-19-2002 08:29:53  
Your question is essentially two part, One dealing with the 8V starting, and the other dealing with the lack of power. Being electrically challenged, I don't have a lot to say about the electrical side of it.
However, as far as the power side of the question goes, you might try this. I've seen many comments in here about Marvel's Mystery oil freeing up stuck rings ETC. I've never used myself but I'm hoarding a can of it to try on something. I've heard nothing but good about this stuff for years. In all likely hood your loss of power is due to poor compression, which is a byproduct of sitting too long. It was meant to run and it needs to run. However, Having sat for so long, It has accumlated a little internal rust here and there. Perhaps on the cam lobes ( Good place to look)
maybe on one or two cylinder walls, who knows for sure? Now this "Rust" is Iron oxide. And it's abrasive. Sorta like having a diamond paste coursing through your engine's oil gallerys. In the aviation field, we'd run the engine for a few ( Less than ten) hours and do an oil change.Then another after say, half the normal time between changes. DON"T DEPEND ON YOUR OIL FILTER TO GET THIS STUFF OUT. Especially on a partial flow system like an N engine. Unless your engine was shot when the machine was parked, It should come back , at least most of the way by running. Good luck, Rich

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Mountainman

12-20-2002 10:09:32




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 Re: Re: 8 volt 8N won't run under load in reply to Rich, NJ, 12-20-2002 03:27:50  
Rich,

"In the aviation field, we'd run the engine for a few ( Less than ten) hours and do an oil change.Then another after say, half the normal time between changes."

And that is the perfect time to add MMO - when you are going to run an engine and then change the oil. Also add it again for the second oil change.

I have used the stuff for years when reviving a motor that sat a long time. Also squirt some into the cylinders through the spark plug hole when you are going to leave the engine sit a few days - this helps get the engine freed up faster than just adding to the engine oil.

I don't even know who makes Marvel Mystery Oil (maybe I should buy some stock - grin).

No reason it wouldn't work in an airplane motor too.

N - joy.

Mountainman...CA

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don b

12-19-2002 11:16:30




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 Re: 8 volt 8N won't run under load in reply to Will, 12-19-2002 08:29:53  
I have read about what size the battery cables should be on this board from time to time.The original battery cables were 1/0.These are the cables you need for 9-2-8ns. don



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Patrick (NJ)

12-19-2002 09:06:58




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 Re: 8 volt 8N won't run under load in reply to Will, 12-19-2002 08:29:53  
As DavidO said, check the archives about what to do with an engine that hasn't been run in a while. My 8N hadn't run in about 10 years. It started easily enough (ran poorly too), but then I really went through every system, changing fluids, checking stuff, to make sure I didn't break anything and ruin my good fortune. Ultimately, I found a few minor things, (fan belt that look good, but was cut, a stripped nut on the pinion gear that required a split, but fortunately hadn't done any damage, no oil in the steering box, etc.). It took me about three weeks of weekend tinkering, and I then I started using the tractor. I took it easy at first, but I use it now and it works great. One of these days, I'm going to restore the cosmetics, but for now, I've got a great little machine.

Good luck

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Danny in CO

12-19-2002 09:05:44




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 Re: 8 volt 8N won't run under load in reply to Will, 12-19-2002 08:29:53  
Will,

First, make sure you are getting over 8 volts out of your regulator. Use a volt meter and measure at the battery with the tractor running. If you are getting in the 7-7.2 volt range, you NEED a 6 volt battery. If you are getting around 9 volts, someone has made changes to regulator/generator.

My guess is that you will get around 7 volts which means you need a 6 volt battery.

After that you will need to find out why 6 volts won't turn it over very well. My guess is that you have dirty connections somewhere. Also make sure you have 0 guage battery cables, not the automotive ones from Wal Mart (or some such place).

For your power issue, if you plugs look good, check your firing order: 1243. These old tractors will run on only 2 cylinders.

Good luck!
Danny

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If I understand==bj/8n/mt

12-19-2002 09:02:07




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 Re: 8 volt 8N won't run under load in reply to Will, 12-19-2002 08:29:53  
If I understand your post the tractor is a front mount distributor that had an eight volt battery in it when you got it and you repaced that. If who ever put in the eight volt battery did it right there should be some sort of resistor in line ahead of the balast resistor behind the dash to reduce the coil voltage. Front mount coils have justly gained a reputation for being electrically fragile and if it ran at eight volts for any length of time there is a good chance it is toast. The vendors of most eight volt batterys suggest you run voltage reduction on any bulb, radio, other voltage sensitive electrical stuff. My suggestion either get a six volt battery or find out how to get the coil voltage back where it should be.

Next thing on either system is all of the connections need to be "clean brite, and tight" and the battery cables need to be two gauge or better. If you have the cut rate auto twelve volt cheapies for battery cables you have the cause of the trouble with slow cranking nailed.

Welcome aboard and just keep in mind that what works on late model stuff may or may not work here since these machines were designed to be fixed in the field with what you had in your overall pockets.

Your mileage may vary

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DavidO

12-19-2002 08:44:56




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 Re: 8 volt 8N won't run under load in reply to Will, 12-19-2002 08:29:53  
Congratulations on acquiring an 8N. I am sorry that you already invested in an 8V battery. You should take it out before it causes you a lot of trouble and put in a new/good 6V battery. There are a lot of posts on how to start a tractor that has been sitting for a long time. An archive search will probably give you more than you want to know. Of course, you should change all of the fluids. The fact that it started up is a good sign. Follow that with a good tune up and then troubleshoot as necessary. Post specific symptoms and you will get a lot of good responses from this board, but, PLEASE, get rid of the 8V battery.

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Dell (WA)

12-19-2002 08:59:02




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 Re: Re: 8 volt 8N won't run under load in reply to DavidO, 12-19-2002 08:44:56  
Will..... ..what David said..... ...
8 volts will burnout your 6 volt frontmount coil, not good.

Suggest you seriously consider getting an I&T FO-4 manual. Readily available at sponsors of this great N-Board, most tractor parts emporiums, www.n-news.com which has a great archive of 3-point implement manuals, even my local John Deere dealer has 'em onnna the rack display for sale. $29 cheap, gettcha 1 and readitt..... ....Dell

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