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Old 09-09-2013, 07:46 AM   #15
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Location: Cincinnati, OH
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Agree that some soapy water solution is your best technique. As stated the core seals, not the cap. Although a metal cap may have a rubber ring inside that could be sealing if the core is leaking. The cap is not intended as the air seal. Look over the tread carefully for anything like a nail or screw. You should be able to take it to the orig install place and have it checked for free. Any tire shop can do it as long as the tire size is in their capability. If y ou do have a nail or screw in the tread, have it dismounted and a real patch put on inside. A plug can work, but it is not as good or permanent as the patch. Also when dismoutned for the repair, you can check the bead area is clean for best sealing after the repair.

2005 Kenworth Showhauler truck conversion.
. 44 ft, Cummins ISX15 450 hp, 10 speed, twin screw
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Old 09-09-2013, 10:06 AM   #16
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Had an interesting leak just a few weeks ago. Every once in a while, while checking before a trip, I'd find my inner rear dual leaked down to zero. Use my little pump to get it up to 25PSI and limp to a truck stop to top it off at 90PSI. Then off I'd drive, checking periodically. On the road, it would always be right. And it would stay right. Sometimes for weeks.

Three times over a years time, I had it removed and checked by a shop. Immersed in water and all. Never found a leak. It was a head scratcher and the shops had no idea what the problem might be.

Finally, it did it at an RV park right across the street from a truck tire shop. Got it up to 25PSI, limped across the street, explained the problem and they had the tire off before the day grew warm. Immersing it in a tank, it showed bubbles coming from the wheel!

With the tire off the rim, we could see tiny rust through spots in the rim. Just two of them. What was happening was that overnight, on cold nights, the rim would shrink just enough to allow air to escape. Driving it a while would cause the rim to expand enough to choke off the leak. So once the tire was warm it wouldn't leak. This explains why 3 shops couldn't find a leak. Why I could drive for weeks at a time without it going flat is a mystery.

They checked around for a new wheel with no luck. So I had them clean up the area around the holes, and we put a couple of Eternabond patches over them. No leaking so far. Another use for Eternabond.

'02 Winnebago Journey DL, DSDP, 36' of fun.

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Old 09-09-2013, 05:43 PM   #17
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I think I found mine with the valve core, we shall see.

Just bought a nice air compressor off Amazon does 85# quickly don't know how good it is beyond that, only weighs 20#'s. I carry it in the MH low amp draw 110v,

2008 Bounder 38P F53 24/30K V10, 2013 Kia Soul Basic 6 speed manual, Ready Brake Elite tow system (previous equipment 1996 Pace Arrow Vision w/Acme Dolly)
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Old 09-09-2013, 05:48 PM   #18
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Being the tire is that new, I would think it would be under warranty. Who is your road service provider. You could call them and have them service it even if your sitting at home. I assume you have 16" tires so that shouldn't be a problem for them to take care of it on the spot. Good Luck.

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