Forum Discussion
Jim
Jun 30, 2017Explorer
Had a similar problem once with one tire that intermittently lost air. It was hard to figure out any pattern as it would be fine for weeks then on occasional mornings, getting ready to get back on the road, it would be low by 40 odd pounds. Instead of 90 PSI, it would read 45 PSI. Took it to shop after shop...they'd remove it, and do a tank dunk, but no bubbles. Ever. Even when they left it totally submersed for an hour.
Then one time, staying just 100 feet from a truck tire shop, I measured the tires early in the morning and sure enough that one tire was low. Took it over to the shop, and he found the leak very quickly after dunking it.
Turned out that the leak was in the wheel, not the tire. Rust through. Those slow leaks would occur because of the cool night would cause the steel wheel to shrink slightly, and air would leak out. Warm up the wheel, and the holes would close back up. Which was why there would be no leak after driving 4-5 miles to get to a tire shop. Those leaks were caused by tiny pinhole rust spots that went all the way through the steel. Since the wheel had been painted white inside, it was easy to spot the rust spots, so I grabbed my roll of Eternabond, cut off little patches, and after cleaning the spots, stuck them on the leaks.
Never had another problem with that wheel. Sold the rig 4 years later but I imagine it's still holding air. That EBond is great stuff.
Then one time, staying just 100 feet from a truck tire shop, I measured the tires early in the morning and sure enough that one tire was low. Took it over to the shop, and he found the leak very quickly after dunking it.
Turned out that the leak was in the wheel, not the tire. Rust through. Those slow leaks would occur because of the cool night would cause the steel wheel to shrink slightly, and air would leak out. Warm up the wheel, and the holes would close back up. Which was why there would be no leak after driving 4-5 miles to get to a tire shop. Those leaks were caused by tiny pinhole rust spots that went all the way through the steel. Since the wheel had been painted white inside, it was easy to spot the rust spots, so I grabbed my roll of Eternabond, cut off little patches, and after cleaning the spots, stuck them on the leaks.
Never had another problem with that wheel. Sold the rig 4 years later but I imagine it's still holding air. That EBond is great stuff.
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