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Old 11-07-2015, 09:12 AM   #1
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Valve Stem/Core Question

I have a 2015 Tiffin Allegro with 22.5 inch tires. One inside dual is very difficult to inflate, and always has been. Access is fine but it takes about 5 or 6 seconds to fully register on any pressure gauge. And it can easily take minutes to bring it up even two or three pounds with steady, firm pressure on the air chuck. Different air chucks make no difference. Other wheels are no problem.

The valve stems are metal and I have a TPMS system attached with no problem. I don't know if the stems are "extenders" or a solid stem. I am trying to inflate to 85# using a 120 # compressor.

I am assuming the issue is the valve stem core and my questions:
.. is this something that can be adjusted or replaced without having to remove the wheels?
.. if the core needs to be replaced, would most decent tire shops have in stock?
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Old 11-07-2015, 09:21 AM   #2
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If all the other tires inflate correctly then the valve is most likely the problem. Any tire shop can change the valve, it just screws in and out. Yes the HAVE them in stock. It only take thirty seconds to do.

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Old 11-07-2015, 09:22 AM   #3
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core needs to be replaced, truck tire stores should have stems and can replace them.
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Old 11-07-2015, 09:23 AM   #4
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Depending on access ; size of the opening in the outer rim; replacing the valve core should be no problem with the wheels on the coach.
JMHO: If your TPMS is operating properly, and you're only adding air once or twice a year; that's my average; getting this one problem fixed , may be more trouble than it's worth.
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Old 11-07-2015, 09:33 AM   #5
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It maybe a sticky valve - nothing that a tire shop that handles truck tires wouldn't have. Also, the 120 psi compressor may not give you 85 psi at the output. I tried a brand new 150 psi 8 gallon Kobalt compressor from Lowes and couldn't get 120 psi so I returned it back. You might want to consider getting a Cat's Eye Tire pressure equalizer for your dual tires. Not only it will be better for your tires but will also make it a lot easier to check and visually keep an eye on your tire pressures.

Good luck!
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Old 11-07-2015, 09:59 AM   #6
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I think you may find, that the metal pin that runs down the inside of your extender, is not long enough and isnt opening the main tire valve enough. I had this problem on mine. You can prove this, by unscrewing the extension, and filing the tire valve directly witha longer truck tire filler. Finding a good extender that fills correctly AND works with tpms correctly has been difficult.

Personally if I had one that worked perfectly with tpms but was slow to fill, I'd keep it.
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Old 11-07-2015, 12:58 PM   #7
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Quote:
Originally Posted by Kiawah View Post
I think you may find, that the metal pin that runs down the inside of your extender, is not long enough and isnt opening the main tire valve enough. I had this problem on mine. You can prove this, by unscrewing the extension, and filing the tire valve directly witha longer truck tire filler. Finding a good extender that fills correctly AND works with tpms correctly has been difficult.

Personally if I had one that worked perfectly with tpms but was slow to fill, I'd keep it.
Found this to be my problem with inflating an inner as well as getting the tpms system to register.
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Old 11-07-2015, 03:47 PM   #8
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Since its a dual, you can remove the core and let the tire deflate. Install new core and then re-fill. You can also put the rear jacks down to hold the weight while you do this.

Question is, do you have a filtered core or the short core. Filtered core could be blocked up. I added the filtered extenders to my two front tires and the fill time is much longer now. Also, I found that the tire installer had stuffed a filtered core into my valve stem, which isn't designed for it. Took quite some time to get that out and corrected.
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