Posted by A.D. on October 20, 2009 at 16:32:59 from (75.145.145.109):
I have a International 574. It has the C-200 engine with the Marvel-Schebler carburetor.
The problem:
It will idle fine and throttle up to about 1000-1500 RPM but much more than that it'll bog and die out. If I pull the choke to about half, it'll run up to PTO RPM and run like a champ but has a hard time idling like that. This leads me to believe that it's running lean.
I bought this tractor back in February, and it's ran fine all spring and summer long until two weeks ago when it just decided to do this out of the blue.
I've had problems with junk in the tank clogging the inlet to the sediment bowl so I flushed out the tank, and double checked by removing the fuel level float and inspecting the tank through that hole. No obstructions.
I've removed and cleaned out the sediment bowl and it's valve assembly, and replaced the cork gasket and screen.
I've removed and used compressed air to blow out the fuel lines from the tank to the fuel pump, and from the fuel pump to the carb.
I've pulled the carb, and torn it completely apart twice, removing all jets and little pieces - cleaning it all thoroughly both times. The second time I replaced the bowl gasket, throttle shaft seal, and the gasket between the carb and manifold.
The shut off solenoid seems to be working properly as I can flip the key and hear it click. I've removed it from the carb, and have seen it work as a double check.
I can crank the engine over and with the drain plug removed from the carb's fuel bowl, it will flow what I consider to be plenty of fuel out the bottom, so I'm positive the carb is getting fuel.
The idle mixture screw is set correctly and it idles around 650 RPM as the manual states.
The manual says there's a "main fuel adjustment screw" at the outer end of the fuel shut off solenoid but when I unscrew it to the recommended 4 1/2 turns, it falls out around turn 3. I don't think it actually contacts the plunger as the manual says it should when it's fully screwed in. It looks as if the plunger seats in the end of the solenoid fitting itself and the screw is just a small jet of sorts. When I took it out of the solenoid the first time for cleaning it was screwed all the way in and tight. I assume that's the way it's supposed to be because I've never messed with it and it's worked correctly in the past.
I've sprayed penetrating oil around the intake where it mates to the head to see if I have a gasket leak there and that makes no difference in how it runs.
That's pretty much all the information I can give at this point.
I'm at my wits end and am seeking advice from others.
Any and all help will be appreciated.
I can take pictures of anything you need if it may help in a diagnosis.
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