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04-30-2021, 01:10 AM
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#1
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Site Team
Join Date: Apr 2017
Location: Colorado Rockies
Posts: 1,910
M.O.C. #19755
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Tire Valve Core
Are all tire valve cores the same? I have an interesting problem. Went to the shop today and found one of my tires flat. This is the same tire that I replaced the valve core in a while back. The reason the valve core was replaced? After adding air, it would not spring into the closed position. So, today I added air using my Milton inflator; got it up to 110psi, pulled the inflator off and same problem. This is the second valve core to do it. Ok, I put a third new valve core in; same thing. Now I'm starting to suspect the Milton inflator is somehow damaging the valve cores so I used a different air chuck; same results with third core; will not seal. A little experimentation found that if I unscrewed the valve core a few turns, it would pop closed. Then I could tighten it back up and it would hold. That is the condition now; I'll check for a flat in the morning but not hopeful.
I cannot swear to it (blaming it on old age memory loss), but I think I had a similar issue on a different tire, but only replaced the valve core once and all is well.
So here is the question. Are all valve cores equal? Maybe I have some junk and need to look for better ones. I did a Google search and did not find much.
I just had another thought; I use the 507 TPMS with cap style (not flow through) sensors. When these are on, the valve core is continuously held open. Could this be causing an issue? I don't really think so, because a lot of people use this system and I have never heard of a problem. I don't leave the sensors on all year; I take them off for the winter.
I guess my next step is to try to find some high quality valve cores or replace the valve stem on that wheel.
Anyone else experienced this? Suggestions?
__________________
Scott & Alta
2017 Montana 3160RL, Legacy, Onan 5.5Kw, Solar
2022 F-450 Lariat Ultimate
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04-30-2021, 04:17 AM
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#2
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,109
M.O.C. #25165
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I have the EEZRV TPMS with similar sensors to what you have with the TST. I leave them on all year with no issues. I only remove them to add air when needed. My guess is the core you are using may be off spec a bit. If you can back off a little and get it to seal, then the spring may be weak or not seated correctly, etc. I don't think it is being caused by the TPMS sensors though. I'd look into getting new cores and see if that fixes the problem.
__________________
Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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04-30-2021, 07:05 AM
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#3
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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At this point I would replace the whole stem assembly.
__________________
2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, disk brakes. 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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04-30-2021, 08:22 AM
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#4
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Montana Master
Join Date: Mar 2013
Location: Frostproof, FL USA
Posts: 2,362
M.O.C. #13272
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I had a stem fail last year while on the road. My TST system alerted me and I was able to get off the road and change the tire out. My valve stems were less than two years old and even though we are full timers I take my button sensors off if I am stationary for 2 weeks or longer.
__________________
Previous: 2008 Montana 3400RL & 2014 3725RL
Current: Full Time 2022 SOB TT Toy Hauler
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05-05-2021, 09:30 PM
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#5
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Site Team
Join Date: Apr 2017
Location: Colorado Rockies
Posts: 1,910
M.O.C. #19755
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Update. I pulled the old old valve core (#3) out of the trash and see why it was leaking, but no idea what caused the damage. See photo #1.
Since the one I had in there (left rear tire) had stuck once, I did not trust it and replaced it. I pulled the core out and found the orange extension cap on the valve core; see photo #2 (top). Now, this is where it starts to get weird. I am 100% sure that cap was not on the core I installed a couple days ago. The one I installed was like photo #2 bottom; got a whole pack of them. Thinking senility was setting in, I figured I must have worked on the front left not the rear left. Pulled the core out of the front tire; also has a cap on it. I'm not so far gone that I could be on the wrong side of the 5th wheel.
So, two questions:
1. What is that cap on the end of the valve core?
2. Which one of you guys got into my shop and changed it?
__________________
Scott & Alta
2017 Montana 3160RL, Legacy, Onan 5.5Kw, Solar
2022 F-450 Lariat Ultimate
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