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Tractor Talk Discussion Forum

1946 ford 8n tractor

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10-11-2010 17:49:10

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need help with a 46 8n. i have a no start condition. i have spark and i have vaccuum but the fuel which is flowing through the carb just fine is not reaching the cylinders. the owner says he has had 5 different people look at it (which may be whats wrong with it) and thinks that maybe the valves are whats wrong with it. i put some gas in the cylinders to no avail and the spark looks weak not blue more yellow but i cant even get it to backfire. any help would be greatly appreciated. thank you

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Paul in MN

10-12-2010 16:24:01

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 Re: 1946 ford 8n tractor in reply to chrisparkercvilleindiana, 10-11-2010 17:49:10  
Possibly old gas??

I have had the ethanol gas suck enough water vapor out of the air to make the gas almost non burnable. My son did not believe it, so I poured a few spoons full into a coffee can and set it out in the gravel drive. I tossed a piece of burning paper into the can and the gas hardly burned (it was like a smoky old road lantern of the 40's). After fully draining the tractor's gas tank and putting fresh gas in, it started and ran fine (better after running for about 10 minutes so it cleared the remains of the crappy stuff out of the carb).

Maybe this tractor has the same problem??

Paul in MN

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10-11-2010 19:15:01

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 Call this guy in reply to chrisparkercvilleindiana, 10-11-2010 17:49:10  
He built it.

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10-11-2010 19:03:09

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 Re: 1946 ford 8n tractor in reply to chrisparkercvilleindiana, 10-11-2010 17:49:10  
First off you need to know what it is for us to be able to help you. Never was a 1946 8N first one was in 1948 and last year of them 1952. Does it have a 3 or 4 speed tranny?? If 4 then maybe an 8N if it has a flat head engine. As for weak spark a yellow spark is not hot enough to light the fuel so no back fire etc.

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10-11-2010 18:04:04

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 Re: 1946 ford 8n tractor in reply to chrisparkercvilleindiana, 10-11-2010 17:49:10  
Vacuum but fuel not getting into cylinder? How did you measure vaccum? If valve were stuck open- has happened to some- then a vacumm gauge would read very low or none when turning engine over. A shot of ether direct into cylinder through spark plug hole would tell a little if spark was enough. Try a compression gauge at spark plug hole- 75 pounds should get you started, should be 100+ but 50/60 on up will usually start- may smoke with worn rings. A bad cylinder with stuck valve open would give a no pounds reading. 1946 should still be 9n with 3 speed tranny- a 4speed indicates 1948 8N. A 12 volt battery jump will start weak coil, poor points most time when you have a little spark on test if timing not way off. RN.

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Frank Dodson

10-11-2010 18:10:31

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 Re: 1946 ford 8n tractor in reply to RN, 10-11-2010 18:04:04  
I think a 1946 would be a 2N.

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10-12-2010 15:01:07

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 Re: 1946 ford 8n tractor in reply to Frank Dodson, 10-11-2010 18:10:31  
1946 a 2N? Possible, the 2N pattern was made and sold about 1/2 year+- after Japan surrendered and commodity rules were lifted- took a little while for tractor people to get copper and rubber suppliers caught up. 2N would still be 3 speed tranny. RN

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