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Old June 28th, 2010, 01:10 PM
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JSoko JSoko is offline


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Thumbs up Tire Leaking Down ? May be the Rim

Most truck have alloy rims nowdays. And unlike steel rims, a fair number of these wheels leak air. It's not a bead-seat surface leak, where air can creep out between the rim and the rubber, but leak through porosities in the cast-aluminum alloy.
There is a fix, inflate the tire to 60psi, and immerse the whole thing in water. Mark the rim where the bubbles form. Then demount the tire from the rim. Dry and clean the area of the leak on the inside of the rim with carb cleaner or mineral spirits, scuff with 80-grit sandpaper, and cover with a thin layer of silicone gasket sealer. (don't use silicone tub caulk, which outgases acetic acid as it cures; it will corrode the metal wheel and possibly damage the tire-pressure monitoring system sender.) Allow it to cure for a few hours , then re-mount and balance the tire

NOW, most places will replace, not repair a wheel that is porous and leaking
Any wheel that has a porous spot large enough to leak air obviously isn't as strong as one that's properly cast. I've seen wheels fail structurally at speed, and it's pretty scary

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