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Carburetor problems Farmall M

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Dave Leader

05-14-2005 06:50:25

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I recently put new gaskets in my carburetor and when running, I have to keep choke lever pulled all the way open to keep it running. It's a 1949 M . Any sugestions are welcome.

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05-16-2005 10:13:01

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Re: Carburetor problems Farmall M in reply to Dave Leader, 05-14-2005 06:50:25

Hey Dave,
Don't know if you've gotten your carb fixed yet... I had the same problem with my 400 last summer. I ended up soaking & scrubbing the carb for about a week to get all the crud out of every passage. I used the same tricks as have already been mentioned... soak the bowls & parts in "chem dip" cleaner, then use the aerosol cleaner to shoot into nooks & crannies... (CAREFULLY) used tip cleaners in some of the passages, then blew compressed air through EVERYTHING until I was sure each passage was clear. When I finally put it all back together, engine ran GREAT!!! If you haven't done already, don't forget to check (replace) plugs, wires, points, condenser, rotor & cap... cheap & easy... makes a huge difference. HTH!
Regards, DL

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Dave Leader

05-17-2005 05:12:26

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Re: Carburetor problems Farmall M in reply to DL, 05-16-2005 10:13:01

Thanks for helpful hints, I'm checking filter screens today. Checked one filter where fuel line comes into carb-- nothing there. Going to remove sediment bulb (which is clean ) and check screen above that. Should be the reason I have to have choke pulled to make it run. If not a supply problem I will have to open up carb again and thouroughly clean using your suggestions.

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bill neuder

05-29-2005 07:24:02

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Re: Carburetor problems Farmall M in reply to Dave Leader, 05-17-2005 05:12:26

I'M HAVING SAME PROBLEM, TRACTOR HEATS UP AND I
HAVE TO RUN WITH CHOKE ON TO KEEP IT RUNNING.
WHAT DID YOU COME UP WITH AS TO CAUSE? PS I HAd carb rebuilt and i'm going to try tune up.

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supergrumpy

05-14-2005 15:35:42

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Re: Carburetor problems Farmall M in reply to Dave Leader, 05-14-2005 06:50:25

if all else fails, get can of Berrymans B-12 chemtool, dump lots into gas tank and then run it

M should move plenty of gas thru the carb and carry the cleaner with it, if problem is a bit of gum, the B-12 sometimes softens/removes it

also will soften relocate bits of rust and debris all thru the fuel system

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John M

05-14-2005 10:51:21

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Re: Carburetor problems Farmall M in reply to Dave Leader, 05-14-2005 06:50:25

You arent getting enough fuel to the carb.Check you lines and filter and the sediment bowl inlet as well as the screen in the bowl.Also you may have slightly bent the float and have it hanging on the side and ist opening all the way.Could also have trash in the needle/seat,slowing fuel flow.

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Dave Leader

05-14-2005 11:13:49

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Re: Carburetor problems Farmall M in reply to John M, 05-14-2005 10:51:21

Thanks for your reply John M I checked float for wear on pivot attachment and cleaned and replaced
needle valve. I am going to recheck filter screen on fuel inlet. My tractor sat most of last year because of mechanical problems with a stuck intake valve and leaking radiator, and I had a lot of health problems. I pulled the cylinder head, freed the valve and replaced the radiator.

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37WC

05-14-2005 09:53:41

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Re: Carburetor problems Farmall M in reply to Dave Leader, 05-14-2005 06:50:25

Whenever I clean a carb I will gently use the tip cleaner from our acetalene torch to clean the jet passages. You have to be careful not to force the tip cleaner through the jets because it could enlarge them. Only use the tip that will pass through the easiest and only pass it through a couple times. The tip cleaner has an abrasive file like surface that will get the thick guck loose inside the jet. Flush with your carb cleaner, rinse and blow dry. Good Luck.
37WC

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Dave Leader

05-14-2005 10:25:23

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Re: Carburetor problems Farmall M in reply to 37WC, 05-14-2005 09:53:41

Thanks 37WC for the tip , I'll try cleaning the ports.

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Bryan in Iowa

05-14-2005 09:39:37

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Re: Carburetor problems Farmall M in reply to Dave Leader, 05-14-2005 06:50:25

Make sure you don't have any vacuum leaks at manifold , or carb gaskets. You can spray carb cleaner or WD 40 around, if engien picks up ,runs smoother you found leak . Some carbs are a real bear to clean, depends on what is gummed up in them . I found toilet bowl cleaner will help remove some deposits . Other times gotta get the tag wire out and do some digging in passages .

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Dave Leader

05-14-2005 10:33:56

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Re: Carburetor problems Farmall M in reply to Bryan in Iowa , 05-14-2005 09:39:37

Thanks Bryan in Iowa, I recently had the cylinder head off to free up a stuck intake valve and found rust holes in exhaust/intake manifold which I was lucky to find a good one for replacement. With new gaskets on carb and exhaust/intake I eliminated any leaks. I started doing some disking and could'nt keep running consistantly without choking carb. Engine runs fine when it wants to.

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old

05-14-2005 07:35:28

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Re: Carburetor problems Farmall M in reply to Dave Leader, 05-14-2005 06:50:25

Well if it runs as you said its right, but I think you mean you have to keep the choke closed to make it run,Right? Well if you have to keep it closed to make it run then you have a clogged main jet area in the carb. Did you just put in new gaskets or did you soak the carb in carb cleaner and also did you blow all the passages out, etc?? It you didn't you need to do so and some of the passages you can clean out a little more with a small wire.

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Dave Leader

05-14-2005 07:56:07

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Re: Carburetor problems Farmall M in reply to old, 05-14-2005 07:35:28

Thanks old for your reply, I did clean out the bowl good and thought I cleaned out the jets, but didn't use compressed air or fine wire which I will try next. Once again thanks.

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old

05-14-2005 08:14:48

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Re: Carburetor problems Farmall M in reply to Dave Leader, 05-14-2005 07:56:07

I've found in my years of playing with carbs etc. That you need to soak a carb, thaken apart as far as you can take it apart over night in the cleaner. Then I use canned carb cleaner to spray it out that way you can get the cleaner in all the passages. Then I use the compresser to blow it out even more. Even after doing all that I have had a few that just plain would not clean up. By the way your welcome

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Dave Leader

05-14-2005 08:24:51

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Re: Carburetor problems Farmall M in reply to old, 05-14-2005 08:14:48

To old thanks again for your reply, the carb gasket kit came with new butterfly valve and shaft which I did not install thinking my existing one was ok. Should I remove old one and put in replacement?

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old

05-14-2005 09:07:15

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Re: Carburetor problems Farmall M in reply to Dave Leader, 05-14-2005 08:24:51

That would depend on how good the old shaft is. On some carbs it wears badly on others it doesn't. If it has a lot of play in it I'd replace it if its tight I wouldn't. Most of the time I don't even pull them out because it can be a real pain in the $#% to do so. I do know from what I have read on this site in the Farmall area that those carbs can have a problem in that area, but I have never seen that problem on one. And your welcome again, always happy to help if I can.

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Dave Leader

05-14-2005 10:40:12

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Re: Carburetor problems Farmall M in reply to old, 05-14-2005 09:07:15

To old: Thats the reason I left mine alone, it seemed tight eith very little play, and also, it didn't seem like an easy job to put in new one. I think I'm going to try cleaning jets as some others have sugested. Thanks again for your input.

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Dave H (MI)

05-14-2005 07:09:43

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Re: Carburetor problems Farmall M in reply to Dave Leader, 05-14-2005 06:50:25

Here is one suggestion and I only mean it in the nicest way.....post this over on the International forum (if you haven't already) and you will get a lot of help from guys who specialize in these things. Watch out for a young fella named McKay, though. Ya just never know about the Irish.

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