1946 ford 8n tractor

chrisparkercvilleindiana · Oct 11, 2010

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

RN · Oct 11, 2010

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.

Frank Dodson · Oct 11, 2010

I think a 1946 would be a 2N.

old · Oct 11, 2010

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.

msb · Oct 11, 2010

He built it.

http://www.youtube.com/watch?v=ruOgh5_93zA

RN · Oct 12, 2010

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

Paul in MN · Oct 12, 2010

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

1946 ford 8n tractor

chrisparkercvilleindiana

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RN

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Frank Dodson

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