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Old 08-05-2019, 08:06 AM   #1
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Tire pressure and monitoring system

I'm embarrased to say it took me 1-1/2years to find out the 2 inner rear axle tires have plastic valve stems. I bought a tire pressure monitoring system for 6 tires and a new compressor so I can fill my own tires. How and why would the inner tire valve stem be white flimsy plastic. I can't even get a good seal to check pressure and I'm leery to attach the heavy screw on monitoring cap. I also didn't realize there were options but I bought the caps and not the flow thru sensors so I will have be screwing and unscrewing to fill with air and I worry about the plastic threads. Any guidance greatly appreciated.
These are original tires with almost 20K miles on them. My understanding is the original tires good for around 30K or 4-5 years. Will I be able to get new inner tires with a better valve stem?
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Old 08-05-2019, 09:42 AM   #2
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Things may have changed since I owned my 2013 Interstate, but, when I purchased my TPMS system, I paid a tire shop to install new metal valve stems on all my tires.
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Old 08-05-2019, 10:14 AM   #3
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Quote:
Originally Posted by Mansderm161 View Post
I'm embarrased to say it took me 1-1/2years to find out the 2 inner rear axle tires have plastic valve stems. I bought a tire pressure monitoring system for 6 tires and a new compressor so I can fill my own tires. How and why would the inner tire valve stem be white flimsy plastic. I can't even get a good seal to check pressure and I'm leery to attach the heavy screw on monitoring cap. I also didn't realize there were options but I bought the caps and not the flow thru sensors so I will have be screwing and unscrewing to fill with air and I worry about the plastic threads. Any guidance greatly appreciated.
These are original tires with almost 20K miles on them. My understanding is the original tires good for around 30K or 4-5 years. Will I be able to get new inner tires with a better valve stem?
MANSDERM161 - First, good for you for getting the compressor. I have one for home but still need to get one for portable inside AI (and I have had my AI 1.5 yr). Need to buy one asap. I am very happy with TST tpms caps (not flow through). Not sure which you bought but most are pretty similar size wise . I prefer cap sensors vs. flow through. Yes, need to get rid of plastic valve extenders. Get the metal valve extender kit from BORG Industries. They are the best and is highly recommended by all in the forum. See details I posted on this thread

http://www.airforums.com/forums/f240...em-182266.html
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Old 08-06-2019, 12:41 AM   #4
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Get metal valve stems and don't bother with the flow-through caps. Works great over many years and miles.
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Old 08-06-2019, 05:43 AM   #5
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Thanks. Will do.
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Old 08-06-2019, 09:10 AM   #6
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This compressor (DeWalt Model#D55140) checks all the boxes for me; capability, size, portability, sturdy build. Fits nicely under the rear bench seat of my AIGT Ext.
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Old 08-06-2019, 09:13 AM   #7
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Metal Valve Stems, TST monitoring system, flow through sensors - would not leave home without them
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Old 08-06-2019, 09:33 AM   #8
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Originally Posted by Luckysnuck View Post
This compressor (DeWalt Model#D55140) checks all the boxes for me; capability, size, portability, sturdy build. Fits nicely under the rear bench seat of my AIGT Ext.
LUCKYSNUCK - Good to know. I been waffling about (still after all this time) as to whether to get +12v on-board permanent mount in engine compartment as WACHUKO did with his ARB compressor or always portable +12v like the VIAIRs or a portable 120vac like you mention or a lithium batt operated one like the RYOBI's. I would only use to top of tires and beach inflatables, really light duty stuff, so the smallest size of all the options may end up being my tie-breaker. I like the idea of cordless lithium battery operated stuff but then it's one more charger I have to carry inside the AI. So many good choices out there makes it hard to decide.
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Old 08-06-2019, 10:09 AM   #9
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One item on my to-do list is to install a 12v trolling-motor outlet in the rear of the coach. I'll do that when I install the MPPT solar controller that is sitting on my desk and connect the outlet with the same 12 ga wiring that connects the solar controller.

I'll install the male plug on my VIAIR compressor. That provides a robust connection for the VIAIR where I can easily reach around each side of the coach to service all tires.

Trolling motor plugs and outlets are available at most any marine supplier and have plenty of capacity for the compressor.
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Old 08-06-2019, 11:26 AM   #10
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Suggest you find portable compressor with two pistons they will bring to higher pressure than cheaper one cylinder/one piston without overheating.
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Old 08-06-2019, 07:58 PM   #11
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I also use the TST monitoring system.
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Old 09-01-2019, 02:15 PM   #12
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Where to buy the Borg Valve Stems
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Old 09-01-2019, 06:52 PM   #13
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Where to buy the Borg Valve Stems
I bought mine from this shop. . .

http://yourtireshopsupply.com/catego...printer-trucks

Also installed a TST TSMP after getting an inner dual flat during a road trip some years ago. The plastic valve extenders that Mercedes installs are a joke and will fail if you attach anything heavier than the original plastic valve cap. I had installed metal valve caps with a pressure indicator and it was too much weight that caused the valve stem to split.

No more tire issues after 90,000 miles. Now I'm due for new Michelins.
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Old 09-02-2019, 11:45 AM   #14
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Thanks I will check them out.
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Old 09-02-2019, 11:51 AM   #15
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I was wondering if you can just change out the rubber seal on these?Click image for larger version

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