Unusual Carb Leak

Farmall Cub Forum -- Questions and answers to all of your Cub related issues.

Moderator: Team Cub

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.

Unusual Carb Leak

Postby Dave.49.cub » Sat Apr 24, 2004 7:30 pm

I've been working on a 1949 Cub I bought a while back and trying to get it read for grass cutting season.

The carb was leaking and I decided to rebuild.
I got a carb rebuild kit and rebuilt it and thought all should be fine, but it still leaks in the same place.

It's leaking from the choke shaft in the carb onto which the butterfly valve is mounted. It leaks from both sides.

This is the shaft that the choke rod is connected to that flaps the butterfly in the air intake passage.

It's like the seals around this shaft on both sides are just worn out.

Has anyone seen this? and does anyone have any suggestions. I sure appreciate the help.
Dave.49.cub
Working Tractor 1949 Farmall Cub
Project Tractor 1952 Farmall Cub
User avatar
Dave.49.cub
 
Posts: 43
Joined: Fri Apr 16, 2004 10:43 am
Location: OH, Springboro

Postby John *.?-!.* cub owner » Sat Apr 24, 2004 9:13 pm

If it's leaking gasoline around the choke shaft you have a serious flooding problem. There shouldn't be any gas at the choke, much less deep enough to leak around the shaft. Assuming this is only after it has set for a while, the float is probably not closing the float valve and allowing the carb to overflow back into the breather pipe..
"The Constitution is not an instrument for the government
to restrain the people, it is an instrument for the people to restrain the
government lest it come to dominate our lives and interests." Patrick Henry
User avatar
John *.?-!.* cub owner
Team Cub Guide
Team Cub Guide
 
Posts: 19101
Joined: Sun Feb 02, 2003 2:09 pm
Location: Mo, Potosi
Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.

Postby Cub-Bud » Sat Apr 24, 2004 9:13 pm

If you bought the carb kit from Case/IH, the kit of choice among farmallcub.com members, the seals for the choke shaft and the throttle shaft should have been in there. If so, did you replace them :?: Also, you may want to check the float level....sounds like to much fuel is getting into the carb. Lurker Karl is a good source for carb info.....he will probably post a reply as well. :wink:
"Never forget where it is you come from, or you may find yourself someplace you don't want to be"

Greg Norman
User avatar
Cub-Bud
Team Cub
Team Cub
 
Posts: 3220
Joined: Sun Feb 02, 2003 6:30 pm
Location: MS, Pope
Zip Code: 38658
eBay ID: Cub-Bud
Circle of Safety Award
Circle of Safety: Y

Re-Checked Carb

Postby Dave.49.cub » Mon Apr 26, 2004 7:31 am

After checking the information in the FAQ and Rudi's excellent manuals online, I took my carb apart again and had a look at the float travel. The book says it shoud only travel 3/16" and mine was easily going 1/2". I carefully bent the tang to reduce the travel and now is set at 3/16".

I ordered my carb kit from Wenger's but will get my next one from Case IH. I rode out to my Case IH dealer in Wilmington this weekend, and picked up a few things.

I'll report back how it looks. I'm betting that fixed it.

Thanks all,
Dave.49.cub
Working Tractor 1949 Farmall Cub
Project Tractor 1952 Farmall Cub
User avatar
Dave.49.cub
 
Posts: 43
Joined: Fri Apr 16, 2004 10:43 am
Location: OH, Springboro

Postby Dave.49.cub » Thu May 13, 2004 8:25 am

Just an update on this.
I followed Cub-Bud's advice and got me an IH carb kit and then built me one of those U shaped tube devices to check the level of fuel in the float bowl and it worked like a charm. See the picture here http://www.metrotone.com/20040507_Grace_Haley/slides/IMG_2720.JPG.
My 1949 Cub doesn't leak a drop and it cranks up on the first turn and purrs like a kitten.
Thanks to everyone for your help. I hope I can help someone some day.
Dave.49.cub
Working Tractor 1949 Farmall Cub
Project Tractor 1952 Farmall Cub
User avatar
Dave.49.cub
 
Posts: 43
Joined: Fri Apr 16, 2004 10:43 am
Location: OH, Springboro

Postby johnbron » Thu May 13, 2004 11:49 am

:P _ Dave, Glad to hear everything worked out good for you.

Isn`t it great that we can get such good knowledge from the "Cub-Guru`s" on this board. Sometimes it is even free. :P
Then came Bronson
User avatar
johnbron
CubPro Emeritus
 
Posts: 2809
Joined: Sun Feb 02, 2003 2:31 am
Location: Puyallup, WA.

Postby Donny M » Thu May 13, 2004 11:52 am

I've used those so called carb kits from "others". There is absolutely no substitute for the Case/IH Kits. I wouldn"t use the "others" even in a pinch :!: :!:
Donny M
 


Return to Farmall Cub

Who is online

Users browsing this forum: Arthur Luke, Tom, vern b and 8 guests