Toyo M145 valve stem core issues

[Pangaea_Ron]

I recently purchased (6) Toyo M154 245/75 R22.5 tires for my MH from Les Schwab Tires.

I checked the tire pressures when I got home. The pressures were correct (105psi front and 95 psi rears) The valve stem cores did not seat after I removed my tire pressure gauge from the front tires. I needed to use the valve stem caps to prevent the tires from deflating.

I returned to Les Schwab Tires to get replacement cores, which seemed to correct the issue. I also took in my tire gauge and air-compressor filler with gauge for them to calibrate and verify that they were not a part of the issue.

I experienced the same issue again and returned to Les Schwab Tires and they again replaced the valve stem cores with no issues.

I now have low pressure in the front tires (85psi) and the valve stem cores did not reseat after pressuring up the tires to 105 psi. I'm relying on the valve stem caps to maintain pressure.

Any thoughts about what is happening?

[Pangaea_Ron]

I'm a bit skeptical also, but it seemed to work? I'll be very vigilant.

[usersmanual]

Pangaea Ron wrote:
I went to Les Schwab Tires today and they checked the tire pressure and/or core seating. The 105 psi for the front tires was OK, but there was still some leakage from the cores after checking tire pressures. They suggested wiggling the air pressure gauge after checking the pressure to allow the core to seat, which seemed to work. I'll report back later.

there is no way in hell the new core should leak air after checking your air pressure.I sold a lot of tires installed a lot of tires and AP checked a lot of tires in my day and have never ever experienced such

[Pangaea_Ron]

I went to Les Schwab Tires today and they checked the tire pressure and/or core seating. The 105 psi for the front tires was OK, but there was still some leakage from the cores after checking tire pressures. They suggested wiggling the air pressure gauge after checking the pressure to allow the core to seat, which seemed to work. I'll report back later.

[Hikerdogs]

Valve stem cores come in different lengths. It's possible the dealer used a longer one than was originally in the stem. If the stem has a bend or slight curve the core may be interfering with the sidewall of the stem when it's open. If that happens the rod holding the spring in place will bend and not allow it to seal once the pressure gauge is removed.

Here's a link to some information on the types and sizes of valve cores available. Note it's a foreign site with some non-English verbiage. The first group of 17 valve cores are the most common:

http://www.haofeng-ind.com/qmz_f_01.htm

[usersmanual]

dougrainer wrote:
I have NEVER heard of replacing the Internal Core of a valve stem when replacing Tires. The Shops I use, they replace the complete valve stem. Doug

yes if there the standard rubber tire stem for sure but when there the special stainless angled truck stems not so.
Replacing the core only in would be standard in my books

[msmith1199]

Pangaea Ron wrote:
Thanks for your replies.

Les Scwab did want me to return to check the situation periodically. I do not have balancing beads, but it sounds like I should have them replace the valve stems and not just the cores.

I can tell you it took me several trips back to Les Schwab including on a couple of weeks ago, even though I bought the tires three years ago. The first time they had to come to me because the day after the tires were installed both the front ones went completely flat and popped the bead. So they had to send a truck out. Over the last year I developed a slow leak in one of the front tires again. It was only going down maybe 10 pounds a month. I took it back to them about a year ago and the leak was so small they were unable to find it. So a few weeks ago I went to my storage shed and the tire was completely flat and popped the bead again. So they had to come out with the service truck, which is normally a $100 charge. They got the tire back on and I took it to the shop and the guy was able to determine that back three years ago when they were trying to get the leaks stopped, they had over tightened the valve stem and split the little rubber gasket. So they completely replaced the valve stem and since the manager saw it was their fault he didn't charge me anything.

Now normally I think many of us would be bad mouthing Les Schwab over these issues, but I was happy that they fixed everything and went out of their way to fix everything. I'll go back to them next time, but when I go back next time I'm going to go to one that does more truck business. I think that was my problem the first time because I went to one in the middle of town. They didn't even have a truck bay and did the work out in the parking lot. So that tells me the guy who did the tires just didn't have a lot of experience with truck tires. Apparently they take some more skills than your average car tires.

The place I had the most recent tire fixed at (the Manteca Store) has a big truck section in the back where the guys back there only do the truck tires. So he knew what he was doing.

[dougrainer]

I have NEVER heard of replacing the Internal Core of a valve stem when replacing Tires. The Shops I use, they replace the complete valve stem. Doug

[usersmanual]

Pangaea Ron wrote:
Thanks for your replies.

Les Scwab did want me to return to check the situation periodically. I do not have balancing beads, but it sounds like I should have them replace the valve stems and not just the cores.

it sticks me odd that you have no core issues.Then after installing new tires you have to replace the front valve cores not once but now 3 times. seems extremely odd for sure I don't think I have heard of this before but theres a first time for almost everything they say

[Pangaea_Ron]

Thanks for your replies.

Les Scwab did want me to return to check the situation periodically. I do not have balancing beads, but it sounds like I should have them replace the valve stems and not just the cores.

[rgatijnet1]

It sounds more like they used the WRONG beads for balancing. They make an RV specific larger bead that uses the standard valve core.
They also make the smaller beads and the balancing powder, which a lot of places will install, and these require a special valve core.

[msmith1199]

lj2654 wrote:
if you have beads in your tires for balancing purposes you need to have long stems installed. The beads get up under the valve stem seat inside the tire and wont seal.

X2. I had tires installed at Les Schwab and had the exact same problem and it was caused by them using incorrect valve cores for the balancing beads. Took a couple of trips to get them all completely fixed correctly. I like Les Schwab because they went way out of their way to get it fixed, but not all of their techs seemed to understand this issue.

[usersmanual]

enblethen wrote:
Terminology in some cases can be difficulty.
If the valve stems were not replaced and new cores were just installed, there can be debris that can cause issues. Valve cores can have different material for proper sealing especially in those that require higher pressure such as truck and large RV tires.

seeing as its a problem twice in a row and after he gets home and just the front tires I firmly believe its caused by balancing beads but surely the Christ a Huge truck tire outfit like Charles schrawb would most certainly recognize such

[enblethen]

Terminology in some cases can be difficulty.
If the valve stems were not replaced and new cores were just installed, there can be debris that can cause issues. Valve cores can have different material for proper sealing especially in those that require higher pressure such as truck and large RV tires.

[usersmanual]

enblethen wrote:
Did they replace the valve stems or valve cores?
I would have had new metal valve stems installed. Some take a different style of cores which my Les Schwab knows about.

OP thread headline says quote: valve stem core issues