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Carb icing--but I'm almost home!

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Jerry in MI

01-15-2004 19:12:24

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I have torn my 300U carb apart and put it back together too many times in the last week (sometimes in my sleep:))
Anyhow-It is starting and running when the choke remains closed, and it is frosting on the venturi portion exterior.
I have raised the float level up higher, but have continued to get the frost. I am leery of bending it upward any more, do I need to?
Obviously running the choke at all times is not the best option. How much would you suggest moving it if it needs to happen? My book says "the farthest face of the float should be 1-5/16" from the gasket surface when the needle valve is closed." I am very close to this mark already.
Thanks

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Jerry in MI

01-16-2004 13:14:00

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Re: Carb icing--but I'm almost home! in reply to Jerry in MI, 01-15-2004 19:12:24

Thanks guys
I think I'll try to set it richer, get a flex tube for pre-heating the air, and pray that it will work until it warms up enough for me to tear into it again to see if the jet is plugged or fouled. Hopefully you won't hear from me on this issue for awhile.
Jerry

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Dave in CT

01-16-2004 09:49:56

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Re: Carb icing--but I'm almost home! in reply to Jerry in MI, 01-15-2004 19:12:24

From an earlier post this year:

Posted by rebuilder on November 26, 2003 at 03:44:23 from (216.241.135.211):

In Reply to: Re: FARMALL H RUN'S ROUGH posted by parts man on November 25, 2003 at 21:06:09:

I agree! We use our Farmall M extensively in the fall to run an auger and in cold weather had icing problems. We made a somewhat unorthodox fix but it works wonders. First find a steel tube that fits over the muffler and still leaves a 3/4" gap around the edge. Find an old disc blade to fit over top of muffler and weld to tube. use some self tapping screws around bottm of tubing to tighten tubing to muffler. At the top of the tubing cut a hole and weld on a pipe which has same outside diameter as air intake with the head removed. Now just find and old radiator hose or car exhaust piping with a 90 degree bend which will fit between muffler and air intake. Voila! Preheated air, and you can run in the coldest weather with no icing probelms, and when spring comes lossen screws and remove, replace air intake head and you are back to original. We have used this for 15 years and works well on our super M/ H as well.

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Bob M

01-16-2004 07:02:14

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Re: Carb icing--but I'm almost home! in reply to Jerry in MI, 01-15-2004 19:12:24

Sounds like there's a blockage in the carburetor main jet metering circuit. A thorough teardown (including removing the metering orifices), followed by long soak in carb cleaner then a blow out all the passages with compressed should cure the problem.

As the others suggest carb icing is a normal characteristic of these tractors - even when the carburetor is working correctly. Icing seems to be worst when it's about 40 deg and 100% humidity out. Warmer and colder temperatures diminish the problem.

Stuff that helps with carb icing: Obviously both carb mixture screws must be set right so you can get the choke off immediately after starting (choking seems to make icing worse). Have the right thermostat is installed and working. Use a winterfront over the grille to block airflow thru the radiator. (An old poly feed bag held in place with a couple bungees works great!). Minimize idling - put the engine under load ASAP after startup. Shut the engine off (or idle it at � throttle or so) if it's gonna sit unloaded more than a couple minutes. Dumping a couple bottles of fuel line de-icer in the tank sometimes helps. Make a temporary sheet metal shield to catch warm air off the radiator and direct it over the carburetor, or install a heat houser. In extreme cases you can put a flex hose on the air cleaner inlet then arrange the hose so it picks up hot air off the exhaust manifold.

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Mike A

01-24-2004 10:32:46

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Re: Re: Carb icing--but I'm almost home! in reply to Bob M, 01-16-2004 07:02:14

Bob M. hit the nail on the head when he said to run a flex hose right off the exhaust manifold-this definitly works! Feed daily with an M and a 400. Did this to both,cured the problem without any tinkering with the carb adj. Now its unfiltered air but I don't get too upset during winter feeding.Come warm weather I switch back to air cleaner

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Hugh MacKay

01-16-2004 03:06:00

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Re: Carb icing--but I'm almost home! in reply to Jerry in MI, 01-15-2004 19:12:24

Jerry: I have a Farmall 130 that is doing the same thing right now. I had it out yesterday plowing snow. Took about an hour before it was working well in the cold weather. I think probably I have a number of items wrong; carb, thermostat and quite possible points as well. My tractor starts well, just seems to take forever to warm up.

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Donnie

01-15-2004 22:42:24

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Re: Carb icing--but I'm almost home! in reply to Jerry in MI, 01-15-2004 19:12:24

The icing up is fairly normal on the number series tractors. They put better manifolds and intakes on them to keep the fuel and air colder while going into the engine. (More hp). Like Chad said make sure it isn't running to lean. Fatten it up if you have to. It may be that it just needs to soak in some GOOD cleaner for a couple of days. If it has set for a while there could be some build up that your not seeing. Dads 300 and my 450 do it quite a bit. Hope this helps.

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Will Sick

01-15-2004 21:43:49

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Re: Carb icing--but I'm almost home! in reply to Jerry in MI, 01-15-2004 19:12:24

I had an H that did that. I tore the carburator apart on it several times before I found that there was a slug of dirt that was not allowing the gas to go to the power jet. When the choke is on there is a passage that feeds gas thru a different route.This will allow them to run but not as well. With full choke it should stall. There could also be a manofold or manifold gasket leak. I have a 300 and it does not bother much with ice forming on the carb.

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ChadS

01-15-2004 19:21:04

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Re: Carb icing--but I'm almost home! in reply to Jerry in MI, 01-15-2004 19:12:24

Richen the main jet adjustment, On our pullers, when pulling in cold weather, it ices up too,, it never goes completly away but richening the mixture helps reduce it. If you have to run with the choke on,, it is not getting fuel,, you may be mistaking the icing instead of the load adjustment. You might wrap the carb and intake tube with insulation to prevent icing, Hope this helps,, ChadS

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01-15-2004 19:58:42

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Re: Re: Carb icing--but I'm almost home! in reply to ChadS, 01-15-2004 19:21:04

Hi, we had a 300U from 1958 till 1962 and would have the same problem when it was cold in the winter. You would have to run with the choke 1/2 on for 10 to 15 minutes before it would run properly when it was -15F or colder. It would cough and sputter until the engine got up to temp. We would cover the front of the radiator with bran sack to make it warm up faster. We also had a JD 420U and it would start right up and could shut the choke off in 30 sec.
My dad also said the 300 had a cold blooded engine.

My 2 CDN cents
JB

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Jerry in MI

01-15-2004 20:05:22

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Re: Re: Re: Carb icing--but I'm almost home! in reply to JB, 01-15-2004 19:58:42

I may have one from 2001-2004 if I am not able to have this thing running smoothly:) Cold blooded is right, then fouling plugs. Are the 300u's notorious for being touchy?

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