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Old 06-29-2012, 09:35 PM   #15
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Get a flashlight and maybe a mirror. If it's like my braided lines, it will be screwed onto a brass stem coming out of the inner wheel. The outer one should be connected to a brass stem that make almost a 180 out of the outer wheel.
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Old 06-29-2012, 10:19 PM   #16
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Dunner, you are correct..not sure why I over think this. Yes, it's simply screwed onto the inner wheel valve stem. Also makes sense due to the fact that I loose no air when I remove the core from the extender. The original core is closed, preventing a leak..What is baffling me is why the extender will not allow me to bleed air out by pressing down the core pin..I will remove the extender and try to get a reading off the base valve stem.
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Old 06-29-2012, 11:15 PM   #17
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at the bottom of the extender is a pin to depress the valve core and release air into the extender. then there's another core in the extender to release air into the atmosphere/gauge.

In your setup the bottom pin isn't depressing the valve stem core, so you are reading some kind of residual pressure left in the extender after airing the tire up.
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Old 06-30-2012, 06:55 AM   #18
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It's most likely that the pin in the chuck that depresses the valve core is longer than the pin in the gauge. That's why you can add air but not check it. When we added a TPMS sytem we had to replace all the valve stems that had extenders. The valve cores in the extenders were recessed too far for the pin in the sensor to open them.
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Old 06-30-2012, 07:14 AM   #19
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Or the core in the brass stem it seated to far in. Try backing it out a little bit. Same with the one at the outer end.
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Old 06-30-2012, 09:16 AM   #20
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HE DID mention he did not have a TPMS in the orignal post, "I was doing a routine tire pressure check" means he was using a tire pressure guage, not a TPMS. at least that is what it means to me.

With a TPMS you do the routine check every couple of mintues at 55-60 MPH as you drive down the freeway.


The braided extensions often have a wire that runs down the inside, Kind of like the shifter cable on my pedal bike, this connects to the PIN in the center at the cap end so that when you apply the guage the pin pushes the wire pushes the center pin on the tire stem.

If the wire is a bit short, or the guage does not press far enough, you get a low pressure reading.
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Old 06-30-2012, 09:49 AM   #21
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Quote:
Originally Posted by wa8yxm View Post
HE DID mention he did not have a TPMS in the orignal post, "I was doing a routine tire pressure check" means he was using a tire pressure guage, not a TPMS. at least that is what it means to me.

With a TPMS you do the routine check every couple of mintues at 55-60 MPH as you drive down the freeway.


The braided extensions often have a wire that runs down the inside, Kind of like the shifter cable on my pedal bike, this connects to the PIN in the center at the cap end so that when you apply the guage the pin pushes the wire pushes the center pin on the tire stem.

If the wire is a bit short, or the guage does not press far enough, you get a low pressure reading.
We understand that he does not (or at least is not speaking about) a TPMS system. We were just pointing out the situation he has experienced is not the only time the extenders have caused poor tire pressure readings.
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Old 06-30-2012, 11:51 AM   #22
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Uggghh! Still at the camp site..There is no way to remove / replace the extender with the duallys in place. I was able to tighten the extender a little bit. However, out of curiosity I removed the extender core and it does in fact have the flex wire attached to it. Now, I can't get it back in. It must be hanging up on the base stem..ugghhh! Looks like I will have to RV AAA to get this thing jacked up and dually removed.
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Old 06-30-2012, 02:44 PM   #23
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I'm sure you're all tired of my problem and I don't blame you..ha ha ha. I appreciate the tips as I at least know how my valve extenders function...
I was able to get the extender valve core back into the extender sleeve after repeated wiggling. I now have 40lbs psi reading off my hand gauge. This progress from zero. Something is wrong with either the base core or the extender core...
I'd like to take the extender off but how can I reach the base valve stem to get a reading. Do I need to buy a different gauge? I can't even see the stem through the hole..
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Old 06-30-2012, 04:21 PM   #24
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The problem is more likely with the extender than the gauge. Since you only mentioned having a problem with 1 inner dual I'll make the assumption the gauge worked on all the others.

If you can't even see the end of the extender core it's too far down the sleeve. It should be almost level with the end of the sleeve or slightly (1/32" - 1/16") recessed inside the sleeve
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Old 06-30-2012, 05:42 PM   #25
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Thanks Hikerdogs...I wasn't clear in my previous post as I re-read it..Here is where I am with the issue:
1) I'm 99.9 percent positive I have lots of air in this inner tire. Probably over inflated at this point.
2) I don't want to hit the road until I can prove to myself exactly how much pressure I have.
3) There is something wrong with one of the valve cores, either the one in the wheel stem, or the extender.
4) At first, I would push hard on the pin in the extender and got no air. After removing the core from the extender and spraying silicone down towards the
wheel stem, re-installing core, I can make the valve function somewhat. I can now get a reading of 40lbs psi, but it feels squishy.
5) I notice that the pin in the extender is recessed at least a 16th inch. All the other pins are flush or outside the valve stem by a16th inch. I conclude that this
is the problem with not being able to get a good reading.
6) As a further test, I took out my car tire gauge and pressed it onto the valve and it popped the gauge to its 50lb max. I conclude the variance in the gauges allowed
for the different behavior. The car gauge was able to depress the pin better. But the gauge isnt the problem.
7) What I meant to describe in my previous post was; I want to remove the extender and take a pressure reading from the valve stem on the wheel.
However, I see way to get to the valve stem once I take the extender off.

I'm just trying to get back on the road without calling AAA.
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Old 06-30-2012, 06:10 PM   #26
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Can you get the extender off and replace it with another, either from another wheel of a new one?
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Old 06-30-2012, 06:20 PM   #27
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Dunner, good idea...thats why I come here...you all are fantastic. My concern with trying to replace the extender is I see no way to put it back on without pulling the wheel.
I cant see the valve stem through the hand hole, nor get my hands in there to feel around..
I think the first thing I'll do is get my hands on a different truck gauge to see if I can get a reading I believe. If so, I'm on my way.
Then I will schedule the rig into my Ford shop and have them rip all this stuff out and get it right.
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Old 06-30-2012, 06:35 PM   #28
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Can you get at it from underneath? Maybe all it needs is tightening.
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