Is this a Cardburetor or Governor issue?

[John59]

My Dad’s International 300 Utility was running fine but after an hour or so running the tiller box, it started to lose power and choked out under load. After disengaging the PTO, it would run at idle, but couldn’t take throttling up without cutting off. I disassembled and cleaned the carburetor but it didn’t solve it. Tractor starts with choke out, runs ok for a few minutes With choke pushed back in, but starts to cut off at Med-high throttle. Pulling choke will keep it running at the high throttle. Once it’s good a warmed up, it won’t stay on at any throttle position.
What do you guys think? Could this be a governor issue?
(I tried adjusting the fuel load needle and air intake needle without success)

Thanks for any help.

[Slim140]

How's the fuel bowl/strainer? Sounds like it's starving for fuel.

[John59]

Fuel bowl and strainer are clean. (As is the copper screen in fuel intake at the carburetor) If I disconnect the fuel line from the carburetor, the fuel dribbles right out at a pretty good clip. Faster than I think the engine would burn it. But Maybe I’m wrong. I could try running off a reserve tank and line to be sure. Thanks for the idea.

[MiCarl]

It's not the governor. It's going to be fuel system (too rich) or the ignition is falling down when hot.

[Don McCombs]

One other possibility is that the coil and/or condenser are breaking down when hot, a sign of imminent failure.

[John59]

Thanks!! I will pursue the coil/condenser/ignition and see if that solves it. Will my local CaseIH dealer have the parts I will need for an old tractor like this??

[Don McCombs]

Yes. So will a local auto parts store.

[Bill Hudson]

...the fuel dribbles right out...

Should be a steady stream of fuel. "Dribbles" doesn't meet my perception of a steady stream.

Bill

[John59]

Dribble probably wasn’t the right word, but neither is solid stream. I picked up a coil and condenser at NAPA, if that doesn’t work I’ll try a reserve tank. Thank you all for the help. I’ll confirm once it’s solved.

[John59]

Replaced coil with no change. Replaced the condenser and got no fire at all. Put the old one back and back to where I started. Will trade condenser back at NAPA and try that again. I’ll also pick up a replacement coil to distributor wire cause it looked kinda bad. Will also get a reserve tank to verify if it’s fuel flow.
Can anyone expand on what other ignition heating issues it might be? I saw where someone said repacking the wire from the ignition key solved their problem, but skeptical it could have any effect in my situation. More than willing to try if it could work.

[tmays]

Need to check fuel flow out of the carb bowl and double check that main jet is not clogged. I know you cleaned it but I would check again. Should be steady stream. And check that hole in tank is not partially clogged

[John59]

Thomas. Got it. Headed out now to check the flow and verify main jet is open. If I run a very fine cooper wire in the main jet port where the load adjust screw seats, should the wire come out the other end, or should i run the wire in the opposite direction? (Will also check fuel flow at bowl and get video if there is any question in my mind on flow rate)
Thx!

[John59]

Solved. We blew compressed air from the carb end of the fuel line until we heard bubbles in the tank. When the fuel came back through the line, the flow was a full steady stream. Tractor ran perfectly for an hour or so. We’ll take off the tank and figure out how to clean it up. Is there any kind of rust inhibitor or coating the we can use inside the tank to prevent further deterioration?
Thank You all for your advice and sharing your knowledge. My Dad and I are both grateful!

[Bob McCarty]

Red Kote and Por 15 are two products which get good reviews on this forum. Follow the directions carefully and use appropriate PPE.