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Farmall & IHC Tractors Discussion Forum
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Tuning a carb????

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IaGary

11-23-2006 04:51:08




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I've run tractors all my life and never had to adjust a carb. All of our tillage tractors have always been diesel.

The gassers we've had never needed adjusting.

Well my 560 needs some adjusting but I not sure which way and which screws to adjust.

Is there just the two screws on that carb?

When the governor opens up the tractor will start spuddering.

I assume the front screw(on governor side) is the float adjustment.

The fuel line to the carb is clear and has good flow.

Help me out here guys.

Thanks Gary

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Allan In NE

11-23-2006 05:49:21




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 Re: Tuning a carb???? in reply to IaGary, 11-23-2006 04:51:08  
Hey Gary,

Hold it a minute!

Before you start goosin' that carb, remember that with these old gassers, the wear point is that rubbin' block on the points. The block wears and the points tend to close up. For every one degree of dwell change, the timing is likewise changed 3 degrees.

Rule of thumb is, make darned sure all other systems are up to snuff before fiddlin' with the carb.

Maybe your sputterin' tractor is just trying to tell you that it is time for the yearly tune up?

Allan

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IaGary

11-23-2006 08:13:30




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 Re: Tuning a carb???? in reply to Allan In NE, 11-23-2006 05:49:21  
All right you guys.

I knew I should have told you,this is the one I put electronic ignition and new plugs in about 50 hours ago.

Thought that would solve the problem but it didn't.

Had a valve job about 250 hrs ago.

I'm fairly sure its the carb but I was wrong once or maybe twice before in my life.

I'll try Sloroll's method next time I grind a load of feed to put it under a load.

Runs great for all other jobs but the grinder pulls hard and after awhile it starts to spit and sputter like its short on fuel.

Gary

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Don LC

11-23-2006 14:21:20




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 Re: Tuning a carb???? in reply to IaGary, 11-23-2006 08:13:30  
I adjust the carb then lock the brakes ,use 4th gear to put it under a load....adjuat a little more try it again..... works for me..... .Don



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MN Scott

11-23-2006 12:08:08




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 Re: Tuning a carb???? in reply to IaGary, 11-23-2006 08:13:30  
What spark plugs do you have in it? On my 706 if you put in what the book calls far Champion D-21's it will do just that, sputter after it runs awile under load. I put in D-15's or equal heat range brand of your choice and it runs perfect. I would chuck that electronic ignition and put a new set of points in. At least with points you can tell with one look if they are good.



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IaGary

11-23-2006 18:09:47




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 Re: Tuning a carb???? in reply to MN Scott, 11-23-2006 12:08:08  
This tractor would burn points about every 30 hours so I shucked them.

It runs better know than it did with the points.

With the electronic you don't have to check it. Either it works or it don't. No in between like points.

Gary



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the tractor vet

11-23-2006 18:17:39




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 Re: Tuning a carb???? in reply to IaGary, 11-23-2006 18:09:47  
Did ya ever hear of putting a dab of grease on the cam follower and make sure that ya had the correct cond. and that the ballist resistor was wired in, that can be the only reason for points going bad.



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the tractor vet

11-23-2006 10:16:19




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 Re: Tuning a carb???? in reply to IaGary, 11-23-2006 08:13:30  
well your going to tell me i am nuts crazy what ever here BUT first check your timming at full throttel for full advance then open up the screw on the float bowl first turn it in till it just touches the seat then back it out 4.5 -5 turns out . Next tune the air ideal screw and ideal stop screw for best slowest ideal then set the curb ideal . Now it vary well could be the electronic ing. starten to give ya fits or it varywell could be that it is the gas and when working it hard she is getting detonation and in the early stages of swelling a piston and they will act just that way just before they LOCK UP.So to get the fuel thing out of the way before ya grind your next batch of feed treat the old girl to some 93 octain gas and see if that helps. When ya did the valve job did they mill the head?? if they did it raised your comp ratio and also if that old girl had been overhauled before there is a real good chance that whoever did it my have had the earlie 560 update on the pistons to the 263 706 pistons as many of the old 560 gasser were done this way and that made a 560 with over 72 Hp. Now when ya get a overhaul kit for a 560 most kits offered are of the 706 piston.

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NO tools

11-23-2006 08:38:33




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 Re: Tuning a carb???? in reply to IaGary, 11-23-2006 08:13:30  
WELL now thats a Big HELP valve job?
Gary when my father was in the IH thing he always said don't GRIND the valve's on them engine's.THey are (sodium filled or stelite) make's the sealing surface to thin and they can't stand the heat?.
HE always said they get hot and won't seal under hard load."He said replace damage valve's and touch up the seat's. I guess he was saying that they warp at high heat after gringing????? Just sharing past knowledge.
"I" don't want to start war? HAVE a good"N" bill

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IaGary

11-23-2006 09:32:53




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 Re: Tuning a carb???? in reply to NO tools, 11-23-2006 08:38:33  
Bill

They put in new valves and guides and milled or planed the head.

Gary



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NO tools

11-23-2006 10:34:21




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 Re: Tuning a carb???? in reply to IaGary, 11-23-2006 09:32:53  
THATS good you had a good machinist.
Some of the guys around here like to try to patch a torn out side wall? Well you know wath i mean??.
THANKS GARY have a great dinner Bill.



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NO tools

11-23-2006 07:03:25




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 Re: Tuning a carb???? in reply to Allan In NE, 11-23-2006 05:49:21  
GARY i am with allan tell you a little story on 560 this past summer.
Neigbor put points plugs in 560 never could get it to run right?we fooled with it 3--4 evening after work.
finally got down to changeing distribtor? out of my 706 when i took the cap and cover off there it hit me wrong breaker arm the rub block position differant.Don't know where the mix up happened package people? or the jobber?.it sure mess'es with trying to time them engines.nothing well work together?????.
BOYS ck the rub block when changeing them points save's lots of headaches.

HEY she got turkey out here have a good "n" guys BILL

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RustyFarmall

11-23-2006 05:41:25




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 Re: Tuning a carb???? in reply to IaGary, 11-23-2006 04:51:08  
On the 560 carb, the high speed, or load adjustment screw, is located on the bottom front, and points forward. It has the packing nut, or jam nut, on it. You may need to loosen the jam nut a bit but most likely you will not. Turn the adjustment screw out about 1/2 turn at a time until the problem clears up. Here's a hint, the same symptoms can be caused by spark plugs, a weak ignition coil, plug wires, etc. Defective engine/manifold gaskets, or carb to manifold gasket will cause a vacuum leak and could result in the same symptoms.Could also be rust/crud restricting the fuel flow from the tank to the carb, or the fuel inlet screen in the carb.

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Sloroll

11-23-2006 05:13:38




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 Re: Tuning a carb???? in reply to IaGary, 11-23-2006 04:51:08  
On that carb I believe the front screw is idle and the smaller central screw is high speed. Adjust each in it's environment. You will hear how the tractor responds if the carb is clean and functioning correctly. Have a great Thanksgiving Gary.



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