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Farmall & IHC Tractors Discussion Forum
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Question on governor spring.

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unioncreek

04-20-2007 06:54:10




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My M has been idling funny since last fall. I cleaned and rebuilt the carb but no change. I pulled the governor cover and I noticed that the spring was loose, but the coils were tight together like they should be. Is the spring just supposed to be loose like that at an idle or is there some adjustment I can make to tighten it up a little.

Is there any sites that has instructions for adjusting the governors. And what do the adjustment bolts adjust?

Bobg

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ChadS

04-20-2007 14:33:37




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 Re: Question on governor spring. in reply to unioncreek, 04-20-2007 06:54:10  
New idle adjustment screw? If not, some get a ridge built up from wear, and leak and you cant set the idle well. Try blowing the carbs passages out again with high pressure air, check the tiny idle stem, might be plugging up, or its the wrong one,, seen many rebuild kits that give the wrong one. check the mechanical advance in the distributor,, they are usually broke or stuck, if the rotor does not have a good spring snap to it, or feels like it moves but no spring action, the advance is moving the timing back and forth erraticly,, which can also cause a surge in the governor/carb. Replace the springs with new ones, or get some from a Chevy HEI distributor recurve kit, (sold at bout any auto parts store) Check the distributor first, before you tear into the carb,,, might be whats up? Chad

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BF8690

04-20-2007 08:29:44




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 Re: Question on governor spring. in reply to unioncreek, 04-20-2007 06:54:10  
The spring should be loose at idle. Atleast mine is. The service manual gives good instruction on how to adjust the governor as well as the throttle linkage from the governor to the carb. Inside the governor are two stop bolts. One of them sets the max RPM at military, or full throttle. I don't remember exactly what the one does. Take off the side plate from the governor. Take off the top breather tube from the governor, then drop the bowl off of the carb. Open the throttle as far as it will go, you may need someone to hold it back for you. Make sure that the butterfly is open all of the way. If it is not, then adjust the governor throttle lnkage at the top of the breather tube access for the proper throttle setting. It has been my experience that if this is not correct at full throttle it will effect idle also. That will ensure that the max RPM setting and idle setting for the carb is correct. You may want to check your idle speed and fuel main needle. It could be as simple as it is to rich, to lean or not enough RPM at idle. You can also modify your fuel meter tube inside the carb, since you have your bowl off it will be easy to do. Take out the main needle. Then take out the fuel metering tube. Then insert drill bits, into the main jet, one at a time starting with the smallest one. When you get to the drill bit that won't fit drill out the main jet. Then using the same drill bit drill out the the two lower holes in the fuel metering tube. This will give you much more adjustability at the main jet needle. IH carbs were notoriously lean for fuel economy. I did all of this to my 1944 M and it runs way better than it did prior to. Hope this helps.

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unioncreek

04-20-2007 09:48:43




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 Re: Question on governor spring. in reply to BF8690, 04-20-2007 08:29:44  
What is the idle speed on an M?

Bobg



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BF8690

04-20-2007 12:06:48




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 Re: Question on governor spring. in reply to unioncreek, 04-20-2007 09:48:43  
Mine has a magneto so I can't use my RPM meter for it. I adjusted it by ear to a nice smooth idle. Basically, I adjusted it to it's slowest smooth running spot.



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A. Bohemian

04-20-2007 11:55:16




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 Please Back Away From the Toolkit in reply to unioncreek, 04-20-2007 09:48:43  
Low idle: 425 RPM.

High idle: 1595 RPM. But read on:

Think about it. The tractor was running fine with the governor set up the way it was. Unless you changed the adjustments already, the odds are re-adjusting it won't make any difference.

ALL a governor does is help the engine run at a constant speed as load varies. Period. They rarely if ever cause rough running.

An exception: if the engine speeds up and slows down and can't seem to make up its mind what speed it wants to run at, the governor is often at fault. This is sometimes called hunting and can often be adjusted out.

Try this: with the engine off, grab the throttle rod. Move it through its range. It should be very free with little resistance.

Now start the engine. Grab the throttle rod again (watch those belts!) and try to move it. You should notice greatly increased resistance.

Increased resistance? Your governor is probably doing its job (unless it is hunting, as described above) and you should probably not mess with the adjustments until you are CERTAIN nothing else is wrong.

No resistance? The governor is NOT doing its job. It needs to be fixed before being adjusted.

Does the rod move back and forth of its own volition? The governor is hunting. Adjust it per the manual; if it STILL hunts, you may need a rebuild.

I don't bet; but if I did, I'd go dollars to donuts that unless you're experiencing hunting, your problem isn't the governor.

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Bf8690

04-20-2007 12:16:54




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 Re: Please Back Away From the Toolkit in reply to A. Bohemian, 04-20-2007 11:55:16  
You're probably right that it morethan likely isn't the governor. However, the governor linkage directly controls the operation of the carb butterfly. When I got my M I didn't know if any of the adjustments were correct. After I rebuilt the motor and restored the tractor it wouldn't run right. I varified that everything was tight and that weren't any leaks. So I adjusted my governor, per the manual, and it purred like a kitten. It was however surging a little, which is what led me to the governor, as you explained. Then I did the carb modifications, because I pull mine, and it ran even better. The problem here is that he didn't really give enough info to help diagnose the issue. He asked how to do that so I told him. I figure he was asking because he had a surging/hunting issue with it, although he may not have.

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