Carb Problems

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tparslow
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Carb Problems

Postby tparslow » Wed May 04, 2022 12:17 pm

My 1947 Farmall Cub is having problems with the carburetor. Last year when it was running, it would run rough and hard to start. Easy fix clean and install a carburetor kit. Right, wrong. After 2 cleanings and 3 carb kits, 2 were low priced, 1 from IH was very expensive. No luck. When it is turning over it appears to be firing but does not take off. After several carburetor adjustments. i am wondering if my problem is something else. One thought is timing. What might others think?

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Bill V in Md
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Tractors Owned: 1948 Farmall Cub
LT1045 Cub Cadet
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Location: MD, Catonsville

Re: Carb Problems

Postby Bill V in Md » Wed May 04, 2022 2:56 pm

I would make sure you are getting gas flow to the carburetor and that the float is set correctly. After that, I would check the ignition points. Depending on their condition you can either clean them with a points file and reset the gap or just replace them if they look worn (pitted or burnt). After that, I would check the ignition timing.
Bill VanHooser
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Eugene
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Re: Carb Problems

Postby Eugene » Wed May 04, 2022 3:00 pm

Suggest complete engine tune up: starting with compression tests, then ignition system, lastly carburetor/fuel.
I have an excuse. CRS.

tparslow
10+ Years
10+ Years
Posts: 3
Joined: Sun Oct 09, 2011 5:34 pm
Zip Code: 53711
eBay ID: tfpred
Tractors Owned: 47 Cub
Cultivator
Mower
Location: Madison, WI

Re: Carb Problems

Postby tparslow » Wed May 04, 2022 8:00 pm

Points are a good place to start. I'll give that a try. Thanks.

staninlowerAL
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Re: Carb Problems

Postby staninlowerAL » Wed May 04, 2022 8:22 pm

1947 would have originally been a magneto ignition but someone could have replaced it with a battery ignition. IH offered this as an upgrade conversion probably in the early 1950's. Just make sure what you are working with as the process is quite different for the two systems. You can download the electrical equipment service manual GSS 1012 at the Quick Links tab, top left corner of this page. It contains all you need to know about both systems. JMHO

Eugene
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Re: Carb Problems

Postby Eugene » Wed May 04, 2022 9:52 pm

tparslow wrote:Points are a good place to start. I'll give that a try. Thanks.
tparslow wrote:My 1947 Farmall Cub.
1947 Cub. 75 year old tractor. Better check the motor's mechanical condition first. Or not, your choice.
I have an excuse. CRS.

inairam
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Tractors Owned: 1948 6v - Dozer
1949 with kub klipper belly mower. mag 6v - Mom
1950 with plow, 54 blade, mott mag 6v - Roxanne
1953 54 blade, c22, wood 42 6v
1957 6v - barn Queen
1965 lo-boy with c-3 mower 12 v - Loboy
1974 Horse II 12 v c-2
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1979 long strip 12 v stuck engine
130 with international 1000 loader 6 v
1969 140 with bush hog tow behind mower 12 v
Terramite T-6 4WD Backhoe Perkins diesel
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Location: Glen Mills PA

Re: Carb Problems

Postby inairam » Thu May 05, 2022 6:05 am

IF you do the tune up I have had a number of issues with ignition parts even oem parts. I started using NAPA ignition parts and have been seen an improvement in reliability in the ignition area.

Distributor Cap Part # ECH IH350
Distributor Condenser Part # ECH IH200
Contact Set (Points) - Magneto - Ag Part # ECH CS1600
Distributor Rotor Part # ECH IH300 ( battery ignition only not mag)
When you only have 9 horsepower you need to know the names of all of the ponies!

CharlieK
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Re: Carb Problems

Postby CharlieK » Thu May 05, 2022 7:04 am

thanks ^^^^^^^^^^^^^^^^^^^^^^^^^^^

good to know
get er done; life is good

Cubfriend
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Re: Carb Problems

Postby Cubfriend » Fri May 06, 2022 3:57 pm

When adjusting the points, the gap for a magneto is .013 and the gap for a distributor is .020
Frank

Cubfriend
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Posts: 984
Joined: Sat Jan 28, 2012 3:13 pm
Zip Code: 68803
Tractors Owned: 1948 Cub, Kittie; 1948 Cub, Harold; 1949 Cub, 49er; 1951 Cub, Tucker; 1951 Cub, Homely; 1956 Cub High Crop; 1957 Cub Loboy; 57 Cub Loboy w/fasthitch + 194 plow; 1958 Cub LoBoy w/FH, Popeye; 1961 Cub, Beater; #1-1962 Cub Loboy Dually (Originally Orange) w/Foot Throttle; #2-1962 Cub Loboy Dually (Originally Orange) w/Foot throttle; Yellow 1963 Cub Loboy and blade; 1970 Cub, Cubbie; and 5 other Cubs in various stages of disaasembly and disrepair; 1962 Cub Cadet Original; 2 other Cub Cadet Originals; Cub Cadet 100; Cub Cadet 124 w/Creeper; Cub Cadet 147; 2 Cub Cadet 129's; Cub Cadet 149; 1948 Allis Chalmers C w/single frontwheel; 1944 Farmall H w/Tokhiem Cab; 2 One Point Fasthitch Carriers; 2-#100 Fasthitch Rear Blade; 2 Sets Cub 144 Cultivators; 2 Sets Cub #252 Cultivators; 3 Cub #193 Mouldboard Plows; 1 Cub #193 Slatted Plow; 1 1948 Cub-54 Snow Plow; 3 Cub-54 49-5 Snow Plows; Cub #6 Tool Bar w/Disc Blades & Middlebuster. 2-#105 sickle mowers, #152 disc plow
Circle of Safety: Y
Location: Grand Island, Nebraska

Re: Carb Problems

Postby Cubfriend » Fri May 06, 2022 4:02 pm

Eugene wrote:
tparslow wrote:Points are a good place to start. I'll give that a try. Thanks.
tparslow wrote:My 1947 Farmall Cub.
1947 Cub. 75 year old tractor. Better check the motor's mechanical condition first. Or not, your choice.


As Eugene said, the “mechanical part of the engine” could be something as simple as adjusting the valves to help improve compression if they are set too tight from wear over the years.
Frank

NJ Farmer
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1976 Cub Cadet 1200

Re: Carb Problems

Postby NJ Farmer » Fri May 06, 2022 5:40 pm

Make sure you have the right parts in the right carb…….there are different main jet and discharge nozzle jet sizes in the IH 3/4 carburetors not to mention the Zeninth model…. (IH part 251 234 R94 or IH part 364 579 r91). See manual GSS 1411 Rev no1

Wrong sizes will effect the performance of the carb…..however I am leaning more toward ignition issues….

NJ farmer


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