Allis Chalmers 190 engine troubles

Does it have the Holley carb. on it, or the Zenith?

Forgot to mention that I replaced the distributor cap, and rotor last week also.

kind of sounds like the coil breaking down when it gets hot. i had a D17 that done the same thing it was the coil.

If a coil or condenser gets moister in them sometime after they heat up the moister will steam up and can short out the secoundary and the ignition will fail.

We have a gas powered IH utility tractor that acted kind of like that.It would do the same as yours with regard to just barely running at idle with the choke pulled out. We often used the tractor for moving a bale of hay or some other very short task and it never bothered us, but if you tried to rake or bale or anything that took very long it would just quit, generally when you needed alittle more power like going up a hill. The way I finally found the problem was taking the drain plug out of the carb after it died.This proved there was no fuel passing through the needle valve after the engine died and I did have a good fuel flow to the carb inlet. It took me more than a year to find that the rubber tip on the needle valve had swollen and would block the fuel flow into the carb when engine was warm. The updated needle valve is compatable with ethanol and the old one was not.  I always kind of thought it was a fuel problem cause I always had spark after it died. We would finish any long task with a different tractor and forget about it in between times it died.  It was a sweet thing when we finally fixed it. RW

Edited by rw - 28 Dec 2011 at 6:45pm

See how long it runs with the gas cap cracked or off. Ours was doing the same thing this spring. Turned out it wasnt venting and was creating a vacuum in the tank.

I'd try replacing the condensor, cheap and easy.

I have checked seadment bowls, took them off and cleaned with clean gas. I will try cracking the gas cap, or removing it today and see if that helps. RW, my tractor always starts this when I need a little more power, just as you described in your comment. Nearly always when I am going up hill. I am leaning towards this being the culprit.  Dave, my mechanic got the rebuild kit, not sure what he used, or where he purchased it. I will talk to him and see. Thanks for all of the helpful posts!

I think we narrowed it down today. We're pretty sure there is something in the gas tank causing the problem. There was some sludge in the sedament bowl this morning. I cleaned it, and the filter out, and it is running better. It did act up on me one more time today, I took the sedament bowl off and repeated what I had done earlier, and we got good results.