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Old 07-25-2015, 07:07 PM   #1
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Dually tire pressure

I am running 235-80 22.5 Michelin tires on my bounder with flexible inner wheel stems extensions (OEM). I am having trouble with my Nvision TPMS monitors on the flexible stems. I can inflate and test fine but when I screw on the sensors my left rear inboard tire it will not register a pressure. Does any one have this problem with any TPMS systems on the flexible stem extensions? I am trying to determine if I need a different TPMS or have replace the flexible valve stem extensions? After a recent outboard tire replacement due to damage, I am not comfortable without TPMS.
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Old 07-25-2015, 09:52 PM   #2
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Has the sensor battery been changed recently? Has it worked previously? Have you tried switching sensors? That will determine if the extension is the problem or that sensor.
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Old 07-26-2015, 08:26 AM   #3
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The sensors are two months old and have worked up to the point I had the tire replaced which required sensor to be removed. I had a great deal of difficulty getting the sensors to see air pressure on inboard tires with the flexible extensions originally
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Old 07-26-2015, 08:34 AM   #4
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After I had new tires put on, one of my tpms sensors was working strangely. I found tbe valve core in the new stem was not screwed in all the way. This was a new stem installed with the new tire, no extension involved.
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Old 07-26-2015, 08:44 AM   #5
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http://www.amazon.com/Flow-Through-S...S39AN9Y02QAHEN

I have had three systems. This is the only one that worked with extensions and the batteries are easy to change.
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Old 07-27-2015, 09:49 AM   #6
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The problem is not the sensor. The problem is with the valve extension. The sensor has enough leeway to press (open) a normal valve core. Some valve extensions have a core that is a flexible cable. the problem is, with that flexible cable, the sensor can't press the valve core enough to cause it to open.
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Old 07-28-2015, 04:09 PM   #7
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Extenders

I guess I now have to figure out if I can remove the current extenders and replace them with better extenders. I assume the solid stems in the wheel are fitted with valves so I will not lose the air in the inboard tire while changing them.
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Old 07-28-2015, 04:54 PM   #8
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Replace them with solid metal dually valve stems.

Dually valve kits for Motor-homes, Busses and 6-wheeled chassis

Jon
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Old 07-28-2015, 07:49 PM   #9
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Quote:
Originally Posted by vetterod View Post
I guess I now have to figure out if I can remove the current extenders and replace them with better extenders. I assume the solid stems in the wheel are fitted with valves so I will not lose the air in the inboard tire while changing them.
You will need to be careful. You may get the old one off and not be able to get the new one on in its place. I ended up having to jack up the coach and remove the putter, so I could get the original back on. In my case, some told me to try and back out the valve stem core a quarter turn at a time until the TPMS sensor would read. After 3/4 of a turn, the valve stem core popped out, and I couldn't manage to get it back in.

I am waiting till after our next trip ( it's a short one ) and I'm going to the tire service center and see if I can somehow try the extension out to make sure the sensor will read.
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Old 07-28-2015, 09:04 PM   #10
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I do not have extensions on my duals, and I use TST 507 senders. There is enough room between the duals to reach my hand in and screw on the sensors. Once on, they stick out enough to check pressure and add when necessary.
Over the years I've determined using extensions and such only add something else to fail to an already quite complicated machine.
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