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Old 04-02-2014, 09:09 AM   #1
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Tire Question

I noticed my right front tire has a slow leak, after airing the tire up I discovered that air was leaking out the value stem. I attempted to tighten the value stem, with no success at stopping the leak. The tires are almost new and covered by road hazard, but I am not sure what could be the problem. Any ideas? Carrying it to the shop this week.

Tom
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Old 04-02-2014, 09:34 AM   #2
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Personally, I would replace the valve stem myself. I always have extra ones in my tool box. Put the levelers down and deflate the tire, then remove the stem and replace it.
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Old 04-02-2014, 09:39 AM   #3
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You're doing the right thing. A truck tire installer will have the necessary parts to get the problem solved. You don't want to deal with that valve stem 'missile' anyway. If the problem is in the stem itself, they can break down the tire and install a new one. Just not worth fooling around with a high pressure vessel...IMO.
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Old 04-02-2014, 09:42 AM   #4
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That's why you deflate them down first.
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Old 04-02-2014, 09:58 AM   #5
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Originally Posted by al2ride View Post
Personally, I would replace the valve stem myself. I always have extra ones in my tool box. Put the levelers down and deflate the tire, then remove the stem and replace it.
How do you replace the valve stem? I don't have that problem now but this info might come in handy in the future!
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Old 04-02-2014, 10:21 AM   #6
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I did not see a mention on what size MH or tires. If I found a leaking valve stem on our 22.5" wheels, the MH would be going to a truck tire shop to be fixed. Our valve stems are installed from the inside of the tire, meaning that the tire needs to be broken loose from the wheel. Then when it is time to re-inflate the tire, on needs a LOT of air to get the bead seated. I would be taking the MH to a good shop and have them do the work, but that is just me.
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Old 04-02-2014, 10:28 AM   #7
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How do you replace the valve stem? I don't have that problem now but this info might come in handy in the future!
Very, very easy. The only hard part is removing enough air so that the stem doesn't hurt anyone. With cars and bikes no problem since the PSI is pretty low in comparison to the higher pressures of our big tires.

I have one of these that I've had forever and works very well:

Amazon.com: Slime 20088 4-Way Valve Tool with 4 Valve Cores: Automotive

You simply unscrew the valve with the slotted end of the tool after you have left most of the air out of the tire. You then insert the new valve and tighten it. You don't want to over tighten it because you could crush the oring on the end of the valve. Then inflate and test with a bit of soapy water...or spit.
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Old 04-02-2014, 12:20 PM   #8
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Very, very easy. The only hard part is removing enough air so that the stem doesn't hurt anyone. With cars and bikes no problem since the PSI is pretty low in comparison to the higher pressures of our big tires.

I have one of these that I've had forever and works very well:

Amazon.com: Slime 20088 4-Way Valve Tool with 4 Valve Cores: Automotive

You simply unscrew the valve with the slotted end of the tool after you have left most of the air out of the tire. You then insert the new valve and tighten it. You don't want to over tighten it because you could crush the oring on the end of the valve. Then inflate and test with a bit of soapy water...or spit.
So your replacing the valve stem not the whole valve. I think that's where the confusion set in.
You would have to break the tire from the rim to replace the whole valve.
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Old 04-02-2014, 12:28 PM   #9
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So your replacing the valve stem not the whole valve. I think that's where the confusion set in.
You would have to break the tire from the rim to replace the whole stem.
Yes, sorry about the confusion as I'm terrible with terminologies. I think the correct word is valve stem core. Not sure if the OP's leak was from the core or the base of the housing. All the leaks I've dealt with have come from the core. Sometimes they get dirt in them that causes the small seal to leak.
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Old 04-02-2014, 02:52 PM   #10
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That's why you deflate them down first.
Very true. Although I've done it myself, I really don't care for using the leveling system to do maintenance. to jack stands, but not everyone has 'em.

Anyway, there are different manufactures and types(different metals)of valve stems and valve cores. There are also different lengths of cores (the short ones are preferred in higher pressure applications). Also, IIRC, if you install nickel plated valve core in an aluminum stem, there's a good chance of galvanic corrosion and the core will eventually seize. It's been awhile so I'm not sure if I'd know the difference between the different cores. Even though a core change is a fairly simple operation, there are a few too many variables for my comfort zone.

There is the possibility that the slow leak problem might be in the stem itself and not the valve core. I've seen that as well.
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Old 04-02-2014, 02:59 PM   #11
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Schrader Valve = little thingy that flew two campsites over when I unscrewed it propelled by 120 psi .... everything is a big joke until someone loses an eye!
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Old 04-02-2014, 03:14 PM   #12
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Just after Christmas I noticed a slow leak in drivers side outside daul. It was leaking at the base of the stem not the core. I took it to a truck tire shop and they removed the tire, let the air out, broke the bead, removed the old one and installed a new one. I would not have done that myself.
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Old 04-02-2014, 05:21 PM   #13
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Schrader Valve = little thingy that flew two campsites over when I unscrewed it propelled by 120 psi .... everything is a big joke until someone loses an eye!
Oh no you didn't, what were you trying to do?
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Old 04-02-2014, 05:25 PM   #14
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Just after Christmas I noticed a slow leak in drivers side outside daul. It was leaking at the base of the stem not the core. I took it to a truck tire shop and they removed the tire, let the air out, broke the bead, removed the old one and installed a new one. I would not have done that myself.
Yup, unless you have something to brake the bead you will have to have someone replace that one.

I've had good luck with tubeless tire ones. Tubed is another story.
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