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.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
