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Loss of tire pressure


Helipilot

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After we bought our fifth wheel we installed the Goodyear G114 Light Truck Tires (as recommended on this forum and others) to prevent the "China Bombs" from tearing up the wheel wells when they failed. The Goodyear G114's are great but the valve stems are the metal type held in tension with a nut at the base.

This nut, if it is loose or backs off, allows for a slow leak to develop at the valve stem base. Ours had a slow leak dropping from 125 PSI to 65 PSI overnight. Being the idiot I am I removed the tire and took it in to a tire shop to be repaired. They did the soapy water trick and discovered the leak at the valve stem. A simple deep reach socket tightened the nut and the leak was cured. The tire guy said "no charge" but I gave him a $10 bill for the education.

 

Back at our RV I immediately checked the other three wheels valve stems and all were loose but had not started leaking. Passing this on to you folks at "No Charge"

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I believe the original installer (Goodyear Truck shop) didn't properly tighten the nuts on the stems when the tires were installed and balanced. The new tires were installed last summer and have about 5,000 miles of travel on them. These are the 17.5 wheels and really tow well. No other problems. Next project is to install new disc brake pads and new Monroe shocks.

 

The Mobile Suite only has about 25,000 miles on it since new. The previous owner documented about 20,000 miles and we have documented about 6,000 since we purchased it. Great unit and we are snug and warm in a cold rain/sleet mix that has moved in while we are in Illinois for the Thanksgiving holidays. Exactly why I moved to the South as soon as I could, DW was already a born and bred southern lady when we married 48 years ago.

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old stems should be replaced. The rubber seal inside of the rim gets pinched very thin and some rims distort enough to cause leaks there when the stresses are just right. I have lost a number of tires to this problem over the years. But when I replaced all tires in 2013, I did all new metal valve stems like this, too. No more pressure differences between tires that were last topped off at the same time. Depending on where the weight bearing area was on a rim could cause it to go down overnight or not at all.

 

Yes, tightening up the lock nut can help but if the rubber seal on the inside of the rim is already too flattened, it will not last and will start to pucker the gasket behind it.

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  • 2 weeks later...

Update...since my original post we have not had any air loss on any tire. Thanks for the comments folks, we are now back at our home base safe and sound.

 

We are planning to purchase a tire pressure monitoring system before our next trip. Will keep you posted on our purchase.

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