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1950 8N loses power after 30 -40 minutes of run ti

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BEJ

11-08-2005 11:41:58

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My 8N cranks easily and runs like a champ for about 30 to 40 minutes or so. It then starts missing and loses power fast - can hardly pull itself. (It remindes me of an engine jumping time.) After some time (I usually let the engine cool) she will fire up great and be good for another half hour or so. Fluid levels are good although the coolant is probably in need of replacing. Plugs and plug wires look OK and I've replaced the coil (twice), points and condenser. The whole wiring system is starting to show its age a little.

Any suggestions?

PS I don't use any fuel additives - have been thinking about using Marvel Mystery and some lead additives. Also, should I be using the higher octane fuels?

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BEJ

11-16-2005 12:42:28

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Re: 1950 8N loses power after 30 -40 minutes of ru in reply to BEJ, 11-08-2005 11:41:58

Well, helping family members, helping church members and football games (ROLLTIDE - almost) got in the way of tinkering with the tractor so no report. But perhaps this weekend (yea, right with the biggest game of the season in the state upcoming). Thanks, Dan hill for joining in - too bad there is precious little made in America these days. . .

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Dan hill

11-11-2005 02:34:41

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Re: 1950 8N loses power after 30 -40 minutes of ru in reply to BEJ, 11-08-2005 11:41:58

Try another condenser first.Lots of new bum condensers are giving trouble.Imports are made cheap with near slave labor.

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BEJ

11-09-2005 07:39:22

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Re: 1950 8N loses power after 30 -40 minutes of ru in reply to BEJ, 11-08-2005 11:41:58

Thank all y'all for the info and advice. Thanks to Dell and K.LaRue for joining in.

I'll put in new plugs this weekend (they probably need it anyway), check the resistor and most likely go ahead and replace it, and maybe put a new switch in the old girl. The fuel line runs on the opposite side from the exhause manifold but thanks for the advice, K.LaRue-VA .

I'll let y'all know how it goes.

BEJ

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souNdguy

11-08-2005 20:20:13

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Re: 1950 8N loses power after 30 -40 minutes of ru in reply to BEJ, 11-08-2005 11:41:58

Do check for the presence of the ballast resistor on the back of the dash.. should be mounted on a 3 terminal board.. after that.. check the ignition switch as Dell points out.

Soundguy

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K.LaRue-VA

11-08-2005 20:03:57

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Re: 1950 8N loses power after 30 -40 minutes of ru in reply to BEJ, 11-08-2005 11:41:58

Had a problem like that once, it was the fuel line run too close to the exhaust manifold. Cast iron takes a little while to get really hot and if it starts the fuel to boiling in the line, you have a problem that will go away as soon as it cools back down. It about drove me nuts until I re-routed my fuel line away from the heat source.

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Dell (WA)

11-08-2005 14:37:57

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Re: 1950 8N loses power after 30 -40 minutes of ru in reply to BEJ, 11-08-2005 11:41:58

BEJ..... ..ya gotts weak sparkies, buttcha already knew that didn't you? There are 4-common runtime issues with the squarecan frontmount N-tractor.

1) runs for about 1-min and quits; bad condenser
NOT yer stated problem
2) runs for about 5-min and quits; CLOGGED fuel filters (3ea)
NOT yer stated problem
3) runs for about 1-hr and quits; restarts after overnite cooldown
NOT yer stated problem, but could be even tho you've replaced'em twice
4) runs for about 15-mins and quits; restarts after 30-min cooldown
SOUND like yer problem? GUNKED-UP ignition switch, $10 (cheap)

Yer low 6.5:1 compression flathead engine don't need NO high-octaine gasoline or lead additives. It came from the factory with special hardended valve-seat inserts. And while I think MMO is one of the few additives that "work", NOTHING you've reported as problems has ennythang to do with gunked-up lubrication. And besides AIN'T NO LEAD in lead additives, EPA ya know..... ...Dell, yer self-appointed sparkie-meister

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GAJIM

11-08-2005 18:09:40

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Message to/about Dell in reply to Dell (WA), 11-08-2005 14:37:57

Dell: We missed you on the forum while you were away. It just wasn't quite the same.

Although I lived on a farm when I was young (we had an Allis Chalmers C & a Farmall M) & I managed a fleet of 200,000 cars & 500 trucks/buses; I was a newbie to my 8N when I bought her. The responses to my questions were greatly apreciated. Your straight forward, intuitive, no-nonsense, explanatory, personal style was and still is greatly appreciated. I for one am glad you're back. Thanks! GA Jim

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BEJ

11-08-2005 13:37:36

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Re: 1950 8N loses power after 30 -40 minutes of ru in reply to BEJ, 11-08-2005 11:41:58

Thanks paul L, Tim, souNdguy, and Bruce.

Sorry about the lack of info. It's the original 6 volt system, front mount distributor. I haven't seen anything that resembles a ballast resistor. There is something that I assume is a voltage regulator mounted under the hood. Also, I haven't looked at the spark when she starts acting up - usually too frustrated. . .

Is there a preferred brand of coil? I have put one on from Tractor Supply and the local Ford dealer with the same results.

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Bruce (VA)

11-08-2005 12:43:35

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Re: 1950 8N loses power after 30 -40 minutes of ru in reply to BEJ, 11-08-2005 11:41:58

I'm with the other guys in thinking coil problem but like they are saying, what is it? 6v, 12v, front or side distributor? As to the gas, well, it's a low compression, low horsepower engine, so it will run just fine on regular unleaded.

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souNdguy

11-08-2005 12:16:44

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Re: 1950 8N loses power after 30 -40 minutes of ru in reply to BEJ, 11-08-2005 11:41:58

Is this a front mount coil? Do you have the oem ballast resistor inline?

Still 6v positive ground?

When it stalls, what does spark look like?

Soundguy

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Tim...Ok

11-08-2005 12:15:25

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Re: 1950 8N loses power after 30 -40 minutes of ru in reply to BEJ, 11-08-2005 11:41:58

you didn't mention if it's 6 or 12 volts..if it's converted to 12 volts,are you running 6 volt coil with a resistor or 12 volt coil with current limiting resistor?? give us a little more info..sure sounds like coil failure to me..

Tim

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paul L

11-08-2005 12:21:19

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Re: 1950 8N loses power after 30 -40 minutes of ru in reply to Tim...Ok, 11-08-2005 12:15:25

just takin a stab at it but sounds like coil could be goin bad orrrr your condenser could be goin too paul

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