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Old 04-27-2011, 02:36 PM   #1
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Inside Dual - No Pressure Indication

I have a braided valve stem extension on inside dual and can not measure air pressure nor add air to tire. Braided extension has a long core that appears to make contact with core in tire. My guess is the core inside the tire mounted stem is stuck.
Is it normal to leave valve core in the tire stem and have a second core in the braided extenson?
Has anyone had any success unsticking a core on an inside dual without dismounting the outside dual?
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Old 04-27-2011, 04:37 PM   #2
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there are two types of extensions, airless and standard. the airless has a long thin wire that presses against the valve stem and opens the valve core to air up the tire. This type has no pressure in the extension, unless pressed in. the idea is the extension can not leak and deflate the tire. Sometimes this thin wire misses the valve core and you can't get it to take air. To make sure you don't have a flat, Hit the tire with a large hammer. Both tires should sound the same. A flat tire will have a dull thud.
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Old 04-27-2011, 04:49 PM   #3
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Robert, are you using beads in the tire for balancing?
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Old 04-27-2011, 10:36 PM   #4
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The "Airless" ones are adjustable. If there is a locknut, it's an ajustable airless extension. You loosen the locknut, then thread the end in or out of the braided section, then relock it.

There is a very fine line between "don't work at all" "works" and "Leaks"
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Old 04-28-2011, 08:48 AM   #5
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Mine are the ariless type and I am not using any kind of balancing beads inside the tires.

Both tires "thump" the same so I know I have air, just not how much!

I will check the adjustment feature today.

Thanks for the help,
bob g
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Old 04-28-2011, 09:16 AM   #6
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I dunno if this applies here, but............
I normally check the air pressures on all the tires prior to leaving on a trip. I had the braded extensions on the duals. On one set of duals I had a pressure reading on the outside dual and a 0 reading on the inside dual. What I found was that the braiding had rubbed on the stainless steel liner and gone all the way thru the rubber to create a leak. The abrasion was not easily noticable with a casual inspection.
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Old 04-28-2011, 11:52 AM   #7
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rag_ftw,

This won't solve your immediate problem but it will replace those troublesome valve stem extension problems.

It's called the "Dually Valve Stems". There are no parts to press on the wheel inner Schrader valve- because the only Schrader valve is located at the outside end of the Dually Valve Stem. They will provide Schrader valves designed for "Equal" balancing powder, as I have.
I bought a set of these (have them in a bay with me) and the very next time I have an extension problem, which I've had many problems with, the set of wheels will be removed and the Dually Valves Stems will be put on. The company recommends you lay the two tires stacked flat on the ground and bend (by hand) the inner chrome plated brass stem to fit the application (mines 9 1/2" long) through the provided rubber stabilizer (It's just a rubber grommet with a small hole in it) that locates in the OUTER wheels hand hole cut outs.
I'm tired of having extension problems, with pressure sensors on them, trying to adjust valve pressures.

Good luck,
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Old 04-28-2011, 12:24 PM   #8
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I have been thinking the same thing as Max's post. Please let us know what you decide and how it works out.
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Old 04-29-2011, 04:15 PM   #9
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Quote:
Originally Posted by tomwalt View Post
I have been thinking the same thing as Max's post. Please let us know what you decide and how it works out.
I had Dually Valves installed last November when I replaced all of my tires. They sure make it easy to check and add air.

The furnished grommets in the hand holes of the inside duals also provide a stable support for my PressurePro sensors.
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Old 05-04-2011, 06:07 PM   #10
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Thumbs up Dually Valves

Thanks to all for the informative replies. My dually valves were ordered yesterday!
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Old 05-05-2011, 07:47 AM   #11
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Quote:
Originally Posted by Max Hubrich View Post
rag_ftw,

This won't solve your immediate problem but it will replace those troublesome valve stem extension problems.

It's called the "Dually Valve Stems". There are no parts to press on the wheel inner Schrader valve- because the only Schrader valve is located at the outside end of the Dually Valve Stem. They will provide Schrader valves designed for "Equal" balancing powder, as I have.
I bought a set of these (have them in a bay with me) and the very next time I have an extension problem, which I've had many problems with, the set of wheels will be removed and the Dually Valves Stems will be put on. The company recommends you lay the two tires stacked flat on the ground and bend (by hand) the inner chrome plated brass stem to fit the application (mines 9 1/2" long) through the provided rubber stabilizer (It's just a rubber grommet with a small hole in it) that locates in the OUTER wheels hand hole cut outs.
I'm tired of having extension problems, with pressure sensors on them, trying to adjust valve pressures.

Good luck,
Shoot and I just put on new tires! These sure look better than the braided extensions.
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Old 05-05-2011, 09:26 AM   #12
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Quote:
Originally Posted by Max Hubrich View Post
rag_ftw,

SNIP The company recommends you lay the two tires stacked flat on the ground and bend (by hand) the inner chrome plated brass stem to fit the application (mines 9 1/2" long) through the provided rubber stabilizer (It's just a rubber grommet with a small hole in it) that locates in the OUTER wheels hand hole cut outs.
SNIP

Good luck,
OUTER hand hole - that's what I meant to say. Not in the inside dual like I posted but outside dual.
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Old 05-06-2011, 07:10 AM   #13
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Has anyone tried the systems that tie the duals together and balance the air pressure between them?

Dual Dynamics Crossfire
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Old 05-06-2011, 08:20 AM   #14
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I don't think they would be offer a cost savings for RV tires for most people since most RV tires still have great tread when they have to be replaced because of age.

Also doesn't appear that they will work with tire pressure monitoring systems. That is a deal breaker for me.
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