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post #1 of 5 Old 10-10-2019, 10:25 AM Thread Starter
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Valve Stem Question

Hi-

I wasn't sure where to post this, so hopefully this location is OK...

I had a new tube put in one of the rear tires of my Kubota BX and then had the dealer re-load the tire (all work done at dealer). After getting home I put the tire back on my tractor with the valve stem in the 6 o’clock position. When I went out into the garage yesterday morning, I found about 1/2 of a teaspoon of fluid on the rim. It looked like it had dribbled out of the bottom of the valve stem, where it passes thru the rim (see attached). I contacted the dealer and he said that it was expected and it is residual, diluted fluid resulting from the tire being flushed out and was coming from in between the tire and the tube, being forced out the valve stem base and the rim. He said it may do this for a couple days. Before leaving for work I wiped away the fluid and found the same thing in the same amount when I got home last night.

Anyone else experience this or know if this is something that happens? I don’t have any reason to not trust what the dealer is telling me, but being a new tractor owner, I stress about stuff like this.

Thanks for any info!
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post #2 of 5 Old 10-10-2019, 11:24 AM
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Re: Valve Stem Question

I've had tubes weep at the valve stem hole and it was as the dealer told you--some fluid got trapped between the tube & tire and it eventually seeps out or dries up..

If it loses any air though,then I'd suspect the tube got a pinhole in it or was pinched during installation--I'd keep an eye on the tire pressure and make sure its not slowly losing air..


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post #3 of 5 Old 10-10-2019, 01:16 PM
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Re: Valve Stem Question

Just a thought? What did he load the tire with? If he used beet juice, commercially known as Rim Guard, he should have also changed the valves from the rubber ones to metal as Rim Guard sometimes interacts with the glue used in manufacture of rubber valve stems, causing them to leak. The manufacturer of Rim Guard warns about this in the FAQ's
Quote:
Can I use rubber valve stems with Beet Juice Ballast?

It is important when installing liquid tire ballast that you consult a tire professional to ensure that you have industry standard valve stems capable of handling air AND liquid. Many rubber valve stems are air only and therefore the adhesive holding the core in place is subject to dissolving. This can potentially lead to a catastrophic failure and loss of all liquid in the tire.
.

I believe if using a tube the same would apply to tubes.

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post #4 of 5 Old 10-10-2019, 02:27 PM
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Re: Valve Stem Question

Quote:
Originally Posted by Newsman View Post
Just a thought? What did he load the tire with? If he used beet juice, commercially known as Rim Guard, he should have also changed the valves from the rubber ones to metal as Rim Guard sometimes interacts with the glue used in manufacture of rubber valve stems, causing them to leak. The manufacturer of Rim Guard warns about this in the FAQ's
.

I believe if using a tube the same would apply to tubes.
From my reading of the many posts about loading tires, the information presented by Rim Guard, and personal experience, the glue used in the rubber valve stems to hold the valve in place for tubeless tires is subject to degradation from prolonged exposure to products like Rim Guard. A different glue is said to be used for the valves in tubes and metal valve stems for tubeless tires which is not subject to the same degradation.

It is difficult to thoroughly dry out the inside of a tire which was previously loaded. Unless there has been sufficient time for the inside of the tire to air dry completely, a pressurized tube will squeeze any remaining fluid out over time. Just monitor the situation over the next couple of weeks. It should clear up on its own.

In the meantime, measure from the floor to the top of the rim and write down the measurement for future reference. A pressure change of one (1) psi from 14 psi will change the measurement by approximately 1/4" for the 12" tires used on GTs and SCUTs. I learned this after destroying several tire pressure gauges when using calcium chloride and water as the ballasting medium in years gone by. A proper 75% fill of the tire puts the fluid level about 1" above the outside edge of the rim which makes it about 2.5" above the inside opening in the valve stem.

The measurement for my Carlisle 26x12-12 MultiTrac C/S turfs at 14 psi is 19.25" with all implements grounded and the hydraulics relaxed. Note that all tires of the same nominal size are not created equal. Check yours for the specific measurement and pressure. Note that installation of an 800 lb back hoe, even with the hydraulics relaxed, will place additional load on the tires resulting in a different measurement. I drop the hoe before I measure.

Tire pressure changes with temperature changes. If the tire pressure is correct when first loaded, never drain fluid to lower it. You will lose ballast weight and the tire will have to be aired up again when the weather cools down.

The actual level of the fluid can be seen on the outside of the tire in the morning hours, under specific atmospheric conditions of high humidity and cool temps, as a frost or dew line on the sidewall of the tire. I noticed the dew line on my SCUT's tires this morning as I left for a medical appointment.

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Last edited by TUDOR; 10-10-2019 at 02:43 PM.
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post #5 of 5 Old 10-11-2019, 07:55 AM Thread Starter
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Re: Valve Stem Question

Quote:
Originally Posted by TUDOR View Post
From my reading of the many posts about loading tires, the information presented by Rim Guard, and personal experience, the glue used in the rubber valve stems to hold the valve in place for tubeless tires is subject to degradation from prolonged exposure to products like Rim Guard. A different glue is said to be used for the valves in tubes and metal valve stems for tubeless tires which is not subject to the same degradation.

It is difficult to thoroughly dry out the inside of a tire which was previously loaded. Unless there has been sufficient time for the inside of the tire to air dry completely, a pressurized tube will squeeze any remaining fluid out over time. Just monitor the situation over the next couple of weeks. It should clear up on its own.

In the meantime, measure from the floor to the top of the rim and write down the measurement for future reference. A pressure change of one (1) psi from 14 psi will change the measurement by approximately 1/4" for the 12" tires used on GTs and SCUTs. I learned this after destroying several tire pressure gauges when using calcium chloride and water as the ballasting medium in years gone by. A proper 75% fill of the tire puts the fluid level about 1" above the outside edge of the rim which makes it about 2.5" above the inside opening in the valve stem.

The measurement for my Carlisle 26x12-12 MultiTrac C/S turfs at 14 psi is 19.25" with all implements grounded and the hydraulics relaxed. Note that all tires of the same nominal size are not created equal. Check yours for the specific measurement and pressure. Note that installation of an 800 lb back hoe, even with the hydraulics relaxed, will place additional load on the tires resulting in a different measurement. I drop the hoe before I measure.

Tire pressure changes with temperature changes. If the tire pressure is correct when first loaded, never drain fluid to lower it. You will lose ballast weight and the tire will have to be aired up again when the weather cools down.

The actual level of the fluid can be seen on the outside of the tire in the morning hours, under specific atmospheric conditions of high humidity and cool temps, as a frost or dew line on the sidewall of the tire. I noticed the dew line on my SCUT's tires this morning as I left for a medical appointment.
Thanks for the comprehensive and well explained information!

I've been in touch with the dealer, and he seems confident that it is simply excess fluid used to rinse out the inside of the tire, before the tube went in, that is weeping out. He did say that if it does turn out to be an issue they would make it right at no cost to me.
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