This site uses cookies to maintain login information on FarmallCub.Com. Click the X in the banner upper right corner to close this notice. For more information on our privacy policy, visit this link:
Privacy Policy

NEW REGISTERED MEMBERS: Be sure to check your SPAM/JUNK folders for the activation email.

Carburetor leaking

The Cub Club -- Questions and answers to all of your Cub related issues.
Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
KC2LLW
10+ Years
10+ Years
Posts: 20
Joined: Mon Dec 04, 2006 8:38 pm
Zip Code: 12701
Tractors Owned: 1948 FCUB
2005 NH TC45DA

Carburetor leaking

Postby KC2LLW » Mon Sep 11, 2017 3:11 pm

CARB.jpg

Hello,
Went to start my 1948 Cub this weekend and gas is pouring out of the bottom of the carb. Could this be the needle valve not seating? See picture, should I rebuild or just buy a new carb.
Thanks,
Steve

SPONSOR AD

Sponsor



Sponsor
 

Bob McCarty
Team Cub
Team Cub
Posts: 11817
Joined: Tue May 25, 2004 8:02 pm
Zip Code: 80501
Tractors Owned: Cubs, MH Pony, Shaw, Allis G, 1934 Silver King, JD LA and LI, Gibson D, David Bradley Tri-Trac
Circle of Safety: Y
Location: CO, Longmont

Re: Carburetor leaking

Postby Bob McCarty » Mon Sep 11, 2017 4:31 pm

No need for a new carb. Was the sediment bowl valve closed? If so, open it up, be careful to pull the two halves straight apart so you don't break the thin idle tube. Remove the float. You can immerse it in hot water and watch for a bubble stream, which indicates it's leaking. Otherwise, remove the float pivot pin, float, and needle. Check for debris or corrosion in the needle cage/seat. You may need a new body gasket for when you put it back together. TM Tractor or McDonald Carb has them.
"We don't need to think more,
we need to think differently."
-Albert Einstein

KC2LLW
10+ Years
10+ Years
Posts: 20
Joined: Mon Dec 04, 2006 8:38 pm
Zip Code: 12701
Tractors Owned: 1948 FCUB
2005 NH TC45DA

Re: Carburetor leaking

Postby KC2LLW » Tue Sep 12, 2017 4:55 am

Thanks Bill, I will take off the carb and rebuild it. The fuel sediment bowl valve was open when the carb was leaking. I have closed it and will remove the carb.
Thanks,
Steve

User avatar
Glen
10+ Years
10+ Years
Posts: 6095
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: Carburetor leaking

Postby Glen » Tue Sep 12, 2017 5:43 pm

Hi,
Below are pages from the Cub parts manual of the IH carburetor, if you need them. :)

http://www.farmallcub.info/manuals/cub_ ... 012-12.jpg

http://www.farmallcub.info/manuals/cub_ ... 012-13.jpg

KC2LLW
10+ Years
10+ Years
Posts: 20
Joined: Mon Dec 04, 2006 8:38 pm
Zip Code: 12701
Tractors Owned: 1948 FCUB
2005 NH TC45DA

Re: Carburetor leaking

Postby KC2LLW » Tue Sep 12, 2017 7:19 pm

Glen thank you!

User avatar
Glen
10+ Years
10+ Years
Posts: 6095
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: Carburetor leaking

Postby Glen » Tue Sep 12, 2017 11:14 pm

Hi,
The float level and the float drop should be set exactly when you have the carburetor apart.
Some of the guys on here have said it was important to set it right, their carbs didn't work right until they set the float right. Maybe you knew already.
Below is a page from the Cub service manual showing the float level and float drop. The IH carb is in the upper pics.

http://www.farmallcub.info/manuals/gss- ... 002-09.jpg

There is a screen in the gas inlet to the carb, by the threads, it should be cleaned too. :)


Return to “Farmall Cub”

Who is online

Users browsing this forum: No registered users and 20 guests