Rear tire leaks at valve stem

SenorBill

New User
My MF 135 rear tire leaks around the valve stem and when the stem cap is removed. This happened when I tried to add air to improve the seating of the tire on the rim, because the tire has separated from the rim by about 1/2 inch. I am trying to understand if it is a tube or tubeless tire. The valve stem looks like a tubeless tire because it has a nut at the rim, but the separation of the tire from the rim would seem like it had a tube, and the tire does not look deflated.

What would be the best approach? Can it be used as it is, or repair the valve stem without removing the tire, or does the tire have to be removed?
 

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My guess would be a tube tire. They fastened the stem to the rim on those as well. On my TE-20 I put on one of those metal valve caps with the built-in tool to remove the valve core and since they have a rubber seal I was able to tighten it tight to stop the leak.
 
Yep looks like a tube to me most tubeless nuts will be metal.
If the new valve core doesn't work tire has to come off.
Tire looks pretty crispy but the plan would be put a new tube in so probably have to unseat both beads and pull the outside side off. You might be able to slip it in with it just off the beads but its unlikely. Most fluid filled ones have a tube. And the right way would be pulling the tire off cleaning all the fluid out and off the rim to help prevent the rust. new tube then back on.

if it happened to be a tubeless and that was a stem and the tire was in better condition id clamp on right next to the stem and push it over with the bead breaker tool enough to pop a stem in.
 
Cant see the picture but I would try tightening the valve core first, replacing it second, then messing with the tire and tube. Auto parts stores, Walmart, TSC all will sell a multipack of cores and the tool for just a few dollars.
 
Tube. A tubeless stem would have a metal nut holding it in the rim.

I would suggest replacing the valve core housing, if you want to try replacing it. The inside of the valve core housing may be compromised, and a new Schrader valve might not seal in the housing, if you can get the old one out. Jack the tractor up (and keep it up while doing this) and turn the tire so the stem is at 12 o'clock (top) before releasing the pressure, hopefully the fluid level is low enough that you only get air. If the Schrader valve won't come out of the valve core housing the Housing will unscrew out of the stem. You may need pliers to start it turning. Watch out for spraying fluid. If it is calcium it is corrosive so do this where the fluid won't damage things around the tire.

Do you know what fluid is in it? Given it has been leaking fluid (of some type), it would be best to have the tire dismounted, rim cleaned and repaired/painted as needed, tube evaluated for repair or replacement.

TR218A stem.jpgCH3 new style core housing.jpg
 
Cant see the picture but I would try tightening the valve core first, replacing it second, then messing with the tire and tube. Auto parts stores, Walmart, TSC all will sell a multipack of cores and the tool for just a few dollars.
Valve core housings that the Schrader valves (aka valve core) go into on these type stems are usually sold in bubble packs of one or two at places like TSC.
 
If it's leaking around the base of the valve stem, as it appears to be, then the tube is leaking and the tire needs to be broken down, and the tube replaced.

By the moisture it appears that the tire is at least partially filled with some sort of liquid ballast, most likely calcium chloride solution. That will need to be drained, and then refilled once the tube has been replaced. Of course you may be lucky and it's been drained previously, and there's only a few gallons left. In that case you can safely leave it out.
 
Thanks for all the excellent advice. Since it leaks around the base of the valve stem when trying to tighten the nut, the tube is probably damaged and needs changing. A bigger job than I had hoped.
 
Thanks for all the excellent advice. Since it leaks around the base of the valve stem when trying to tighten the nut, the tube is probably damaged and needs changing. A bigger job than I had hoped.
Welcome to the forums. sorry I missed saying that earlier.

This is not just a change the Schrader valve and/or core housing. With this bit of info, that it is actually leaking at the base of the stem, and you tried to stop it by tightening the nut, I will say the tire needs to come off and the cause of the leak found. Likely a new tube is in order. The tire and rim will need to be cleaned to get rid of the ballast residue. The rim should be repaired if there is damage and coated/painted inside before the tire is remounted.
 
Tubeless tire should have a metal hex nut.
1000004829.png


Tube types have either a plastic or brass nut that is round and need pliers to tighten.

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If you have fluid coming from around the stem at the rim when inflating. You have fluid trapped between the tire and tube. In other words. You need to pull the tube and do some patching.
 
Hopefully you got the problem fixed already. Pic attached shows you what can eventually happen if you don't. (Mind you this did take a long time before it rusted out)Screenshot_20241206-201717_Gallery.jpg
 
Just make sure whoever installs the tube knows what they are doing.
This tube was in my Case VAI for many years before it failed. Appears to be twisted over when originally put in.
Amazing that it lasted as long as it did.
Tube left1.jpg
 

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