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IH 656 gas

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hoppy50680

New User
I recently bought a 656 IH that has an IH carb on it. it was running fine but needed gas. I put in 10 gallons of the 10 percent ethanol and all of a sudden it wouldnt run unless you had the choke pulled out at least half way. I tried draining the gas from the carb, that didnt help. cleaned out the sediment bulb, didnt help. finally took the carb off and apart and used compressed air to blow out all the ports, reassembled, didnt help. next I got some carb cleaner and removed the carb and soaked it in the carb cleaner over night.. since I had it all tore down I put in a repair kit. now it will only run with the choke all the way in(open) even when cold. it also spits out black smoke and the mixture adjustment has no effect at all. the only thing I didnt do when I installed the kit was to check the float height. could this be my problem ??
 
I would check float height and verify the needle is actually capable of shutting off the gas with you gently pushing up the float by hand.

My thoughts are all symptoms hint towards flooding/over-rich fueling.
 
Sounds like it is not getting enough fuel! Take the sediment bowl off and see if you have a good flow there if so, keep going and check the carb where the hold up is
 
It is getting to much fuel. Did you have the main fuel jet out when you cleaned it? If that jet is left out it will over fuel and put out black smoke.
Chuck
 
A carb works like a old fashioned fly sprayer. When full the venturi effect pulls easily on the pickup tube. When almost empty it has to suck all the way from the bottom. The float is supposed to keep the level exact so metered amounts are pulled in. I believe your float is off. (or the main jet is not installed or not threaded correctly) JimN
 
(quoted from post at 16:43:04 07/22/09) I would check float height and verify the needle is actually capable of shutting off the gas with you gently pushing up the float by hand.

My thoughts are all symptoms hint towards flooding/over-rich fueling.
Click to expand...
thank you for your quick reply, I checked float height today. its exactly where the book says its supposed to be. when I put it back together I installed the old solenoid gas shut off, I had bought a new one for it when I bought the kit. now it runs with no black smoke but the idle mixture screw still has no effect.
 
(reply to post at 20:12:14 07/22/09)
Click to expand...
the main jet is in, its actually controlled by the solenoid at the bottom of the bowl. the old one has a screw adjustment, the new one I bought has no adjustment. it runs better with the old one in but someone has stripped the threads on the screw so theres no adjustment
 
I would ditch that solenoid and put in a needle and packing. My 2606 had the old adjustable solenoid that the adjusting screw was stripped out and the wire was long gone with the guts all rusty. It was adjusted by putting an oring on the threads and then screwed it in/out for adjustment. I believe it was the 656 gas version on the caseih.com website where I found the part numbers for the needle and packing. I left the same seat in there.

I suspect when you poured the gas in, you stirred up a bunch of rust in the bottom of the tank. Check the archives to fix that with your choice of options. Your fuel line may have a screen at the carb. You need to pull the fuel line and and run a full stream for 5 minutes into a hose and gas can to know you don't have a fuel problem. The top of the sediment bowl above the screen can fill up with rust and block your flow without necessarily any going into the bowl itself.

Post back with what fixes it.
 
The reason it doesn't work is that (believe it or not) there is a plugged up Idle Passage. There is no other good reason for that issue. JimN
 


thanks again to all of you for your help. I will have to check for a plugged up idle passage and perhaps soak it in the carb cleaner again.. on the main jet issue I was going to try to go from the solenoid to a manual one. went to the IH dealer here and that needle is no longer available. while I was there an older mechanic happened to come up to the counter for a part. He told me that the reason they went to the (solenoid fuel shut off and main jet), was when that tractor first came out the farmers were setting it way too lean and they kept burning the valves out. I suppose that was warranty work. anyway the company killed two birds with one stone, it kept anyone from setting it too lean and also stopped the dieseling.
 
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