My float is apparently allowing the fuel level in the float bowl to be too high, so that fuel finds its way (via the semi-circular channel around the venturi area) to the hole over the choke and down to the drip hole. I think I need to lower the float so that it closes the needle valve sooner, but that doesn't jibe with diagram in the service manual (forwarded by Don McCombs) or the diagram that came with the carb rebuilding kit. (The new needle valve seems to have the same dimensions as the old one, and it seems to seal properly when closed.)
At its maximum height (closing the needle valve), the bottom of the float is now about 1 1/2 " (maybe 1 15/32 " ) below the gasket surface of the throttle body. The diagram in the service manual calls for that dimension to be 1 13/32 ". If I raise the float to that height, it seems I will guarantee that the float bowl will overflow.
The diagrams appear to show the top of the float even with the joint between the 2 halves of the carb, specifically even with the top surface of the gasket. The top of my float is now about 5/32 " below that surface.
It seems logical to me that I have to lower the float (to close the needle valve sooner), not raise it as called for by the manual. What am I missing?!!
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.
Float Height - Carb Drip II
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.
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.
-
- 10+ Years
- Posts: 22
- Joined: Sun Aug 18, 2013 2:32 pm
- Zip Code: 06074
- Tractors Owned: 1950 Cub
Sickle Bar
Moldboard Plow - Location: South Windsor, CT
-
- Team Cub
- Posts: 11861
- 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: Float Height - Carb Drip II
Brian, Let me try and explain this in a different way which hopefully will be easier to visualize. Hold the top upside down so the manifold flange is facing up. With the body gasket in place, measure from the top of the cork gasket to the top of the float (as it now sits). That measurement should be 1.4" (1 13/32"). Adjust ment is made by carefully bending the brass hinge next to the float with some needle nose or other small pliers. Now turn the top right side up. The float will drop, opening the needle valve. The distance from the bottom of the gasket to the bottom of the float should be 1.6" (1 19/32"). Adjustment is made by carefully bending the little vertical brass tab that hits the needle valve seat. Make sure the float is centered in the depression of the top and not twisted which could allow it to hit the side and bind. Give that a try and post back if that still doesn't seem right on your carb.
Bob
Bob
"We don't need to think more,
we need to think differently."
-Albert Einstein
we need to think differently."
-Albert Einstein
-
- Team Cub Mentor
- Posts: 17488
- Joined: Mon Feb 03, 2003 6:45 am
- Zip Code: 21550
- Tractors Owned: "1950 Something" Farmall Cub
1957 Farmall Cub w/FH
1977 International Cub w/FH
1978 International Cub
1948 Farmall Super A - Circle of Safety: Y
- Location: MD, Deep Creek Lake
Re: Float Height - Carb Drip II
Brian50 wrote:My float is apparently allowing the fuel level in the float bowl to be too high...
Maybe. Maybe not. Use the technique described on Pages 2-5 and 2-6 of the Cub Service Manual GSS-1411 as shown below. That will determine the actual condition inside the carburetor. Report back with your results.
http://www.cleancomputes.com/Cub/Blue%2 ... -02-05.jpg
-
- 10+ Years
- Posts: 22
- Joined: Sun Aug 18, 2013 2:32 pm
- Zip Code: 06074
- Tractors Owned: 1950 Cub
Sickle Bar
Moldboard Plow - Location: South Windsor, CT
Re: Float Height - Carb Drip II
Hm, looks like I need to create a tool FES 36-3. Seems like a spare drain plug needs to have a hole drilled up the center and be filed round to fit some clear tubing. Nice way to confirm the level in the float chamber. I assume the "specified fuel level" is the 9/16" to 5/8" shown on page 2-2 and on the drawing on page 2-9? There must be something radically wrong in my float chamber - I'll see what I can find. You guys are good. Thanks
-
- Team Cub Mentor
- Posts: 20378
- Joined: Fri Jul 02, 2004 9:52 pm
- Zip Code: 65051
- Circle of Safety: Y
- Location: Mo. Linn
Re: Float Height - Carb Drip II
Well stocked hardware store, plumbing section, plastic hose barbs and tubing. Inexpensive.Brian50 wrote:Hm, looks like I need to create a tool FES 36-3. Seems like a spare drain plug needs to have a hole drilled up the center and be filed round to fit some clear tubing. There must be something radically wrong in my float chamber - I'll see what I can find.
You mentioned a new kit for the carburetor. Some parts in off brand kits do not fit well.
Following is some of my earlier posts on bench testing carburetors. I use the plastic hose barbs and plastic tubing from the hardware store.
Eugene wrote:Check for a fault in the needle valve and seat area.
Bench test for fault. Carburetor top upside down on bench. Plastic hose connected to carb inlet. Elevate plastic hose and fill with rubbing alcohol.
Eugene wrote:Use the Service Manual, fuel system section. Following is how I bench test my Cub carburetors for fuel level in the bowl. Leaks will also show up during the bench tests. I use a plastic hose on the carburetor inlet, use rubbing alcohol, pour alcohol in the inlet hose and check fluid level in carburetor bowl.
Below is with the carburetor installed on the tractor.Get a hose barb to fit the carburetor bowl drain hole and about 3 feet of clear plastic tubing to fit the barb. Install the barb and plastic hose. Hold the open end of the hose close to and above the carburetor. Turn on the fuel at the gas tank. Measure from the top of the fuel in the hose to the top of the bowl. Fuel level should be 9/16 to 5/8" below the two carburetor halves.
I have an excuse. CRS.
-
- 10+ Years
- Posts: 1421
- Joined: Sun Apr 30, 2006 2:54 pm
- Zip Code: 60073
- Circle of Safety: Y
- Location: IL, Round Lake Heights
Re: Float Height - Carb Drip II
If you can't find a hose barb with the right threads, check the zerk selection. that's what I did - then drilled out the spring and ball. Tubing slips over the nipple on the zerk.
Michael Cummings
Eddie - a 1959 International Lo-Boy named after my father in law, who who bought her new.
Eddie - a 1959 International Lo-Boy named after my father in law, who who bought her new.
-
- 10+ Years
- Posts: 22
- Joined: Sun Aug 18, 2013 2:32 pm
- Zip Code: 06074
- Tractors Owned: 1950 Cub
Sickle Bar
Moldboard Plow - Location: South Windsor, CT
Re: Float Height - Carb Drip II
After buying a brass plug and drilling through it, I went to my local hardware to get some plastic tubing and discovered threaded barbs (I hadn't known about them). Checked the fuel level in the float bowl using the barb/tubing system - level is about 1/4" too high. Will adjust float and re-check. No leaks apparent although somehow I managed to cross-thread the iron drain plug. Jeez. I will double check with alcohol.
Will Teflon tape on the drain plug stand up to gasoline?
Re-checked that valves are not stuck - visual through spark plug hole with wife cranking. Operating the crank, that is, she's not cranky. Good cook too.
Figured I'd do a compression check as suggested while I have the tank off again, but my childhood comp. gauge doesn't have a 7/8" adapter. Wonder where I might find one.
Will report back further.
Will Teflon tape on the drain plug stand up to gasoline?
Re-checked that valves are not stuck - visual through spark plug hole with wife cranking. Operating the crank, that is, she's not cranky. Good cook too.
Figured I'd do a compression check as suggested while I have the tank off again, but my childhood comp. gauge doesn't have a 7/8" adapter. Wonder where I might find one.
Will report back further.
-
- Team Cub
- Posts: 11861
- 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: Float Height - Carb Drip II
Teflon is gasoline resistant. You might see if one of the local auto parts stores will lend/rent you a compression tester.
Bob
Bob
"We don't need to think more,
we need to think differently."
-Albert Einstein
we need to think differently."
-Albert Einstein
-
- Similar Topics
- Replies
- Views
- Last post
-
- 15
- 582
-
by Bob McCarty
Mon Apr 11, 2022 12:03 pm
-
- 26
- 878
-
by Gary Dotson
Thu Sep 16, 2021 7:05 am
-
- 13
- 407
-
by lowgearfarm
Mon Jan 10, 2022 6:34 am
-
-
cub ih caruretor float gauge Attachment(s)
by getitrunning » Sun Sep 10, 2023 4:10 pm » in Farmall Cub - 9
- 486
-
by Jackman
Fri Sep 22, 2023 7:51 pm
-
-
- 22
- 857
-
by akguy09
Wed Dec 29, 2021 1:34 pm
Who is online
Users browsing this forum: Leewebb7, staninlowerAL, Tractor Rod and 2 guests