Motor vehicle inner tube valves can often cause slow air leaks due to pressure when inflated, especially during disassembly. The thick glue layer makes it difficult to completely fix the issue. To address this problem, we’ve developed an effective repair method that you can try.
First, loosen the valve nut and push the valve stem into the tire. Use a utility knife to carefully remove the tread around the valve area, exposing the inner tube’s primer. Next, cut three canvas patches with diameters of 20 mm, 30 mm, and 50 mm, and one green rubber patch with a diameter of 60 mm. In the center of each canvas, drill a hole that matches the size of the valve stem.
In the second step, apply raw rubber solution on both sides of each canvas. Then, apply two layers of raw glue around the valve opening on the inner tube. Once the glue is dry, place the canvases in order—starting with the smallest and moving to the largest—aligning their holes with the valve. Insert a small ball of paper into the hole of the top canvas, then cover it with the green rubber patch.
Third, heat the rubber using vulcanization. Place a sandbag under the inner tube and put an old piston on top. Carefully pour about 50 ml of gasoline into the piston, making sure it doesn’t spill into the tube. Light the gasoline and let it burn until it dries. Allow the piston to cool slightly, then add another 50 ml of gasoline and ignite again. After cooling, remove the piston.
Finally, create a small opening near the valve stem, remove the paper ball, and reinsert the valve into its original position. Tighten the valve nut using a pair of cotton gauze pliers to avoid damaging the valve. This method ensures a stronger, more durable repair that significantly reduces the risk of future air leaks.
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