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1970's Case 580CK runs only with choke on

A

Anonymous-0

Well-known Member
I have a 70's case backhoe with G159B gas motor. It runs great for about 20 minutes then starts to miss bad and will only stay running with the choke all the way out. Cleaned carb. New fuel filter. Clean gas bowl. I pulled the gas cap off to make sure it wasnt vapor locking. Still misses and only runs with choke on. The first 20 minutes it runs great. Help.
 
sounds like some thing is floating in the tank and when running it it sucks it down plugging/restricking fuel flow, I have also seen them act similar to that and have a bad or incorrectly wired coil, also does it still have the electric fuel shut off installed? seen them go bad only when hot a start cutting off fuel suppy cnt
 
The farmer that had this before me did not service it well at all. I bet there is something if not a lot of things in the gas tank. I will drain it and see. The coil could be bad. I put new plugs in it and it fires right up now but just dies after 15-20 minutes unless the choke is all the way out. Will check the tank then cap n rotor. Thanks much.
 
I have an old backhoe that sits outside all the time. It will run fine until I get to bouncing it around on uneven dirt, and then starts to sputter. It's water in the sediment bowl and carb bowl every time. I empty them both and it runs fine until it bounces some more and then more water runs into it. One of these days I'm going to coat the tank, but I use it so rarely that it gets forgotten most of the time.
 
Hi Casenutty, I drained the gas tank and found nothing. Cleaned out the glass bowl and installed another new fuel filter. I pulled the carb apart to make sure the bowl and floats etc.. were clean and in good working order. All look good. It still runs for about 15-20 mins then wants to die unless choke is out. i did notice the fuel filter is full when I start it but only about 1/4 full when it dies. The glass bowl is constantly full of gas and is flowing ok. I did notice above the carb and at the bottom of the intake manifold it turns super cold. Even today in the 80's that area was ice cold. I know this sounds crazy so I took a picture. I will try to upload it on here.
 
Here is some pics of the top of the carb and bottom of the intake manifold. It doesnt show it very well but it is sweating for being ice cold even though the rest of the engine is 160F. Makes no sense.
 
I had to register so my handle is now likealloldtractors. Still trying to upload my pictures.
a73206.jpg

a73207.jpg
 
the icing at those temps is odd for sure the fuel filter you changed is it in line from the seditment bowl to the carb? if so it's not stock I have seen these some times cause problems and am wondering if it is starving it for fuel, did you try opening/removing the fuel cap when it strts to die? vent not open in cap or wrong style of replacement cap sorry if I said this before just trying to cover all bases cnt
 
Was the sediment valve completely disassembled? I have seen obstructions clear down in where the shutoff valve seats that is not visible without disassembly. The bowl being 1/2 full when it shuts off is unusual. I have had instances where inline fuel filters have caused problems on a gravity flow system. Vapor lock???

To run well for 15 -20 mins before causing problems doesn't make sense if the sediment bowl is plugged , it should show up immediately.

Has it had a good tune up lately, a time lapse like you have can happen by a bad condenser or coil breaking down under heat. That still does not explain the sediment bowl issue however. mEl
 
The fuel filter is inline with the glass bowl. They are both at the same level below the gas tank. Then the fuel line runs down to carb.
The carb does not have a solenoid at the bottom of the carb. I ran the tractor with the gas cap off to see if it was vapor locking and it is not. I still have not drain the tank to see if there is something being sucked into the fuel strainer. I still quation why the intake above the carb gets ice cold?
 
I see that in the winter mainly with high humidity here as to the cause maybe mEl will chime in with a better explaination than I have my guess is that when the fuel leaves the jets and travels into the intake it vaporizes the fuel and in that process creates the icing/cold kinda the same way propane does when flowing sorry for no better explaination but mine do it at different times and this does not affect the way they run cnt
 
Hey guys,
Have a new problem that i need help with. With the gas tank full, I turn on the gas bowl valve and it slowly fills up. If I loosen the glass bowl it fills up quick. But then it will not fill up the fuel filter. I took the lines all apart and they are clean and the filter is new. The gas valve is clean also. I need to remove the gas shut off valve from the gas tank and it wont budge. My manual shows a bolt stud from the gas valve to the tank. Does it remove clockwise or counter clock wise? I"m working on this case out in the middle of a field in 100F heat. Not fun.
 
I took apart the tank, bowl valve, etc... and could not find anything wrong. When I removed the new fuel filter the gas flowed perfect and the tractor runs great. I hook up a fuel filter and the gas flow stops. So I put in another new filter and the gas will not flow. I"m running without a filter for now and all is well. Thanks for the heads up with the fuel filter.
 

I know this is a very old post do you still have the backhoe and if so could you post some more picks of it the more the better.
Thanks Keith.
 
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