Farmall Cub troubles

[bill65ss]

i hope someone can help me as i'm about ready to shoot my cub.i tried to start it a couple of weeks ago.it ran about a minute and died and it won't start again. it's got fire and getting gas but will not hit.i'd appreciate any advice.

 

[John B.]

Where is it getting gas at??

At the sediment bowl, carb, or in the cylinders?

Where are you getting spark at, is it reaching the plugs??

If gas and spark are getting in the cylinders and you have spark at the right moment it should run!

Fill an oil squirt can with a little gas and squirt it in the carb while the engine is cranking and see what happens.

Let us know what you find.

John

 

[Rusty wheel]

Sounds like it ran long enough to suck some dirt in the carb. Maybe it's not getting air. rw

 

[kdg]

Make sure that you are getting gas to the carburetor, something a simple as a plugged line or strainer can let a little gas dribble by but not enough to keep it running; a stuck float (happened once in a while on mine) can be a problem also. Try running it with the fuel cap off maybey it is not letting the tank have a vent. If you have recently rebult the carburetor double check the float needle; often they are a rubber like tip and I had all kinds of trouble with mine sticking closed untill it had soaked in gas for a while. The carburetor I have found (I have a 48 with the original type carb) seems to be finicky about cleanliness (jects ect) and adjustment perhaps it could be time for a rebuld?

 

[Anonymous-0]

My grand-dad, Newt, was a mechanic who started his career back in the 1920's. Newt always said that you have to start with the basics, and go from there. To support combustion, you need fuel, ignition, and air...and all 3 in the right amount, and at the right time.

Are you sure you have fuel in the cylinders? How do you know? Once you can answer that, then move to ignition. Are you sure you have a spark to each cylinder, in the proper order, and strong enough to light the air/fuel mixture? How do you know that? And are you sure you're getting air to the cylinders? How do you know?

Even with weak compression, if you're getting air, fuel, and spark in the right amount and at the right time to each cylinder, the engine will run. Compression matters as it relates to cylinder sealing, and suction of the fuel/air charge into the cylinders since we're dealing with updraft carburetion.

You say you have fuel and spark. Where are you checking for spark? At the plug? Or at the plug wire terminal? Or just at the cap? And fuel...are the plugs getting wet? If not, how can you be sure you've got fuel into the cylinders? And if your plugs ARE getting wet, how do you know you're getting spark?

As you see, it's hard to give a definite answer without knowing ALL the facts.

 

[bill65ss]

I'm getting gas at the carb,and I pulled each plug,cranked it over, and got fire on all four.I'll take a look again at the carb tomorrow and see what I find. Thanks for the help, guys!

 

[Jim in Ma.]

Did you make sure the air cleaner is not plugged?