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Cub stops running

J

John A. Halford

New User
I have got my 1951 Cub running. But once the engine is hot it dies. Seems like it is out of gas, but that is not the problem - tank is half full. Once it has cooled a bit it starts right up, and runs for a few seconds - then dies again.

Where do I start looking to fix this?
 
Gas in the tank does not mean gas is getting to the carburetor. Check for rust, scale or dirt in the tank, sediment bulb and fuel line. Obstructed fuel system often allows a small amount of gas to flow but not enough to keep the engine running. After sitting for a few minutes enough gas has flowed back into the carburetor to allow the engine to run for a short time. Or you could have a bad coil causing you to loose spark when hot. Try checking for spark when the engine quits. Dave
 
Pull one of the plug wires asap when it quits running and check for fire. If there's no fire its probably the coil as Dave suggested. Hal
PS: If there's fire you have fuel blockage somewhere in gas tank, gas line or carburetor.
 


If there is also a fuel filter get rid of it, automotive fuel filters are designed to work with fuel presure not gravity.

Also" maybe" retorque the head " loss of compression" was it leaking coolent or burning it ?

Does your carb have the factory screen filter in it right ware the fuel enters the carb "plugged" ?

I have seen ware the condensor in the dist. was bad when it got warm "no spark" !


Just throwing some ideas out that i have seen with cubs , hope one helps.
 
Our MTA had problems similar to what yours sound like. Turned out to be the wire to the coil was down to 2 or 3 strands where it had flexed many times--got hot after running awhile--resistance went up--tractor stopped. Check with an auxiliary wire from the hot terminal on the battery when it quits[alligator clips on ends]. Otherwise probably fuel or points/ cond as the others have noted.
 
Quick and easy. Disconnect line at carb. Blow back into tank, you should be able to hear bubbles. This will tell you what to do next. Don't drink any gas and don't light cigarette.
 
Quick and easy. Disconnect line at carb. Blow back into tank, you should be able to hear bubbles. This will tell you what to do next. Don't drink any gas and don't light cigarette.
 
Quick and easy. Disconnect line at carb. Blow back into tank, you should be able to hear bubbles. This will tell you what to do next. Don't drink any gas and don't light cigarette.
 
Thank you everyone. What agreat site this is
I tried the "simple" solutions (gas tank gap blocked, sediment in fuel line, etc.) so it looks like it is the coil.
When I bought this machine, the ceramic resistance was taped with insulation tape to the top of the coil. I have left it there until I have things running properly, but this is not the correct location, is it?
The coil does not get too hot, but the resitance does. I see you can get a 12 volt coil with built in resistance from NAPA. Will this work in a Cub? Or should I buy a genuine reeplacement. If so, where should the ceramic resistance go?
 

Assuming you have a 12V battery here...

A coil is a coil. The one from NAPA with built in resistance will work fine. You won't get a "genuine" coil from a CaseIH dealer, anyway. It'll be the same one as Napa sells, only more expensive in most cases. Plus if you get an old timer behind the counter you'll get an argument over which coil you really need, and will probably wind up going home with a 6V coil.

If you get a 12V coil with internal resistance, the proper location for the resistor is the trash bin. The resistor is not stock, and does not have a "proper location" on the tractor. It's used to reduce the voltage to the coil on a 12V conversion. Cubs were 6V until the late 1960s.
 
Well, I have done all that has been suggested - checked gas supply (OK), coil (put in new one), condenser(put in new one). But I still have the problem - she starts instantly, chugs along well for about 20 minutes and then stops. Starts again when cooled down. The coil is quite hot when she stops, so I suspect it is electrical. But it is a brand new 12 volt coil with internal resistor. Where do I look now?
 
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