Fuel in oil???

The Cub Club -- 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.
User avatar
Bill V in Md
10+ Years
10+ Years
Posts: 775
Joined: Sun Feb 02, 2003 6:51 pm
Zip Code: 21228
Tractors Owned: 1948 Farmall Cub
LT1045 Cub Cadet
Circle of Safety: Y
Location: MD, Catonsville

Re: Fuel in oil???

Postby Bill V in Md » Wed Mar 25, 2020 6:51 pm

Maybe the carb gasket is interfering with float operation. Or maybe the inlet needle valve is not sealing properly.
Last edited by Bill V in Md on Thu Mar 26, 2020 8:44 am, edited 1 time in total.
Bill VanHooser
Circle of Safety

Eugene
Team Cub Mentor
Team Cub Mentor
Posts: 18053
Joined: Fri Jul 02, 2004 9:52 pm
Zip Code: 65051
Circle of Safety: Y
Location: Mo. Linn

Re: Fuel in oil???

Postby Eugene » Wed Mar 25, 2020 6:52 pm

TonyTractor wrote:yes, it's leaking pretty quick. only after one or two cranks. probably order a new one, can't think of anything else.
Hold on. The carburetor is usually repairable.

Couple of other things to check out.
1. Gasket under the needle valve seat.
2. Needle valve and seat condition.
3. Choke operation.

If you don't want to mess with the carburetor, there are several folks on this site that repair them. Post in The Vine, the want ads section.
I have an excuse. CRS.

Crimson Tim
5+ Years
5+ Years
Posts: 421
Joined: Wed Feb 19, 2014 1:09 pm
Zip Code: 32736
Tractors Owned: The crew:
"John", 1952 Cub
"Paul", 1951 Cub
"George", 1958 LoBoy Cub with Wagner 45 Loader
"Ringo", 1977 Cub

So far, Paul and Ringo have arrived. John and George were supposed to follow ages ago, but apparently have gone awol. Long story.
Circle of Safety: Y

Re: Fuel in oil???

Postby Crimson Tim » Wed Mar 25, 2020 8:07 pm

When I had a flooding problem, I tried the hot water trick and didn’t get any bubbles either. Probably, I didn’t use hot *enough* water. However, I could hear liquid inside the float when I shook it. That liquid is not supposed to be there, so I knew it leaked.

Mind you, these are updraft carbs. If it dribbles some fuel out after you try to start it but it fails, this is normal. It should stop pretty promptly.

Actual flooding, where it just continues to drip (or pour) fuel out if the carb will only be one of a couple easy things:
- Float leaks - replace float
- Float out of adjustment - adjust float height and drop
- Debris preventing the needle & seat from sealing - clean needle & seat
- Damaged or mismatched needle & seat - replace needle & seat

Most likely, it just needs some (more) cleaning or adjustment. If something needs replacing, it’s likely to just be a couple inexpensive parts, not the whole carb. Almost everything on these tractors is eminently rebuildable.

That said, there is definite value to having a known-good spare carb sitting on the shelf.

The problem there is with the “known-good” part. New ones are available, but a lot of them are pretty junky. Not all. Many will need adjustment right out of the box. You may want to buy an old, original IH carb instead.

User avatar
Don McCombs
Team Cub Mentor
Team Cub Mentor
Posts: 14293
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: Fuel in oil???

Postby Don McCombs » Wed Mar 25, 2020 10:11 pm

Get a Chinese repro off of eBay for less than $30. Adjust the float and put it on. Come to Cubfest Northeast in Oxford in October and we can rebuild the IH carb.
Don McCombs
MD, Deep Creek Lake

Image
Proud Member of Maryland Chapter 39
Circle of Safety

User avatar
Glen
5+ Years
5+ Years
Posts: 3821
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: Fuel in oil???

Postby Glen » Thu Mar 26, 2020 12:12 am

Hi,
The needle and seat wear out after years of use, and don't seal anymore. Then the carburetor can drip on the ground when the Cub is sitting.
You said you cleaned it, dirt in it can make it drip too.

Below is a new needle and seat at TM Tractor. It says it is a Case IH part.

http://www.tmtractor.com/new/fl/5183fp.htm

The float level needs setting like the Cub service manual says. Bob M. converted the measurements to use a dial indicator, it's easier than reading a measure.
1.4" is the float level, and 1.6" is the float drop.

TM Tractor has a new float, if needed. The float should feel light, and have no liquid inside.
They have a new gasket for between the upper and lower halves also. :)

Frozenstate
Cub Star
Cub Star
Posts: 174
Joined: Sat Sep 09, 2017 6:20 am
Zip Code: 14414
Tractors Owned: F- CUB Fast hitch 1955 #191991J
Snow plow
Super Chief moldboard plow
Spring tooth harrow
Disc
York rake
Carry all
Fast hitch Mott flail mower

Ferris IS 100 61" zero turn

Re: Fuel in oil???

Postby Frozenstate » Thu Mar 26, 2020 8:08 am

My tractor dripped fuel for years before i came to this wonderful site. It was the float setting all along.
Also, if you are good at soldering, when you have a leaky float and you can find the leak, drill a small hole in the float to drain it out through. Then you solder the hole shut and solder the leak shut, using the solder sparingly.
I have done this several times. My generator has a soldered float in it now. I bought a new one, but never put it in, the repaired one works fine.

TonyTractor
Posts: 40
Joined: Fri Feb 22, 2019 11:04 am
Zip Code: 12444
Tractors Owned: 1948 Cub
1981 Simplicity 7117 Hydro
2009 John Deere LA105 (family/friends can help mow)

Re: Fuel in oil???

Postby TonyTractor » Thu Mar 26, 2020 8:26 am

Thanks folks. As always this forum has been so helpful. With all my cussing and knuckle banging you all remind me to keep it fun.
#1 rule of tractor maintenance or repair: a tractor is not a car.

Eugene
Team Cub Mentor
Team Cub Mentor
Posts: 18053
Joined: Fri Jul 02, 2004 9:52 pm
Zip Code: 65051
Circle of Safety: Y
Location: Mo. Linn

Re: Fuel in oil???

Postby Eugene » Thu Mar 26, 2020 10:00 am

Search under my site name "Eugene" - click on my name, above, left. Search my posts for "bench test". There is a couple of my old posts on bench testing a carburetor for leaks.
I have an excuse. CRS.

TonyTractor
Posts: 40
Joined: Fri Feb 22, 2019 11:04 am
Zip Code: 12444
Tractors Owned: 1948 Cub
1981 Simplicity 7117 Hydro
2009 John Deere LA105 (family/friends can help mow)

Re: Fuel in oil???

Postby TonyTractor » Thu Mar 26, 2020 12:22 pm

Well, I boiled water this time and low and behold, BUBBLES! The float also took on some water or gas, something is in there when I shake it. I'll order a float and needle valve from TM.
Also reading the manual on carb operation really helped. Thanks
#1 rule of tractor maintenance or repair: a tractor is not a car.

TonyTractor
Posts: 40
Joined: Fri Feb 22, 2019 11:04 am
Zip Code: 12444
Tractors Owned: 1948 Cub
1981 Simplicity 7117 Hydro
2009 John Deere LA105 (family/friends can help mow)

Re: Fuel in oil???

Postby TonyTractor » Thu Mar 26, 2020 1:26 pm

[img]float.jpg
[/img]
Attachments
float.jpg
looks like it was soldered before
#1 rule of tractor maintenance or repair: a tractor is not a car.

Bob McCarty
Team Cub
Team Cub
Posts: 9783
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: Fuel in oil???

Postby Bob McCarty » Thu Mar 26, 2020 2:07 pm

There is a small air hole that allows air expansion when the two halves are soldered together. That small hole is then sealed with solder. I think that's what you're seeing.
"We don't need to think more,
we need to think differently."
-Albert Einstein

TonyTractor
Posts: 40
Joined: Fri Feb 22, 2019 11:04 am
Zip Code: 12444
Tractors Owned: 1948 Cub
1981 Simplicity 7117 Hydro
2009 John Deere LA105 (family/friends can help mow)

Re: Fuel in oil???

Postby TonyTractor » Fri Mar 27, 2020 11:39 am

While replacing the carburetor it occurred to me the studs were replaced 7/16th cap screws which have seen better days.

I found the following in the "Eng 1, 4 cylinder manual" Sec A pg 35.

However I cannot determine what size the stud and nut are and if the threads are the same on both ends of the stud. Does anyone know how I find out
and where to purchase. tks


251 236 R1 STUD, Carburetor Order Cap Screw 179 796

251 176 R1 NUT exhaust and intake manifold stud
-4-
order cap screw
Attachments
stud manifold.pdf
(38.41 KiB) Downloaded 6 times
#1 rule of tractor maintenance or repair: a tractor is not a car.

User avatar
Don McCombs
Team Cub Mentor
Team Cub Mentor
Posts: 14293
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: Fuel in oil???

Postby Don McCombs » Fri Mar 27, 2020 11:59 am

The correct studs are 1/4-20 on one end and 1/4-28 on the other. Whether you can use them will depend on whether you have any threads left in the throttle body.
Don McCombs
MD, Deep Creek Lake

Image
Proud Member of Maryland Chapter 39
Circle of Safety

TonyTractor
Posts: 40
Joined: Fri Feb 22, 2019 11:04 am
Zip Code: 12444
Tractors Owned: 1948 Cub
1981 Simplicity 7117 Hydro
2009 John Deere LA105 (family/friends can help mow)

Re: Fuel in oil???

Postby TonyTractor » Fri Mar 27, 2020 12:02 pm

Thanks Dan
Attachments
MVC-479S.jpg
this was on TM's site
MVC-479S.jpg (12.24 KiB) Viewed 52 times
#1 rule of tractor maintenance or repair: a tractor is not a car.

TonyTractor
Posts: 40
Joined: Fri Feb 22, 2019 11:04 am
Zip Code: 12444
Tractors Owned: 1948 Cub
1981 Simplicity 7117 Hydro
2009 John Deere LA105 (family/friends can help mow)

Re: Fuel in oil???

Postby TonyTractor » Fri Mar 27, 2020 12:58 pm

sorry meant to say Thanks Don.
#1 rule of tractor maintenance or repair: a tractor is not a car.


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall Cub”

Who is online

Users browsing this forum: MilGunsmith and 2 guests