Cars & Vehicles Auto Parts & Maintenance & Repairs

How to Repair Flat Tire & Replace Valve

    • 1). Inflate the tire to 32 pounds per square inch using the air inflation gauge on the tire machine. Place the inflated tire into the flat tire inspection tub and check the tire for leaks. Visible bubbles will appear from the leak in the tire. This procedure should be done even if there is a visible nail or object to ensure there has been no other damage to the tread or sidewall.

    • 2). Mark the leak(s) in the tire that are acceptable to repair (see warnings) with tire chalk. If the leaks cannot be properly repaired, the tire will need to be replaced. Also, mark the position of the valve stem's relationship to the outside sidewall of the tire.

    • 3). Remove the valve core from the valve stem using the valve core remover. Allow the air pressure of the tire to completely dissipate. Remove any wheel weights that are affixed to the bead of the rim so you do not damage the bead of the tire.

    • 4). Break the tire down from the rim using the tire machine and tire tool bar. Remove the tire from the rim.

    • 5). Place the tire into a tire repair stand with the location of the puncture at a comfortable level to repair. If necessary, remove any visible objects from the tire tread. Note: If inflation aerosol or an external tire plug has been used, the inflation aerosol will need to be cleaned out thoroughly from the internal bladder of the tire, or the external plug will need to be removed.

    • 6). Note the angle of the object in the tire tread and insert the tire reamer into the puncture. Turn the reamer to enlarge the puncture until you can push and pull the reamer easily in the belt.

    • 7). Squirt pre-buff tire cleaner in a - inch radius around the puncture hole and wipe dry. Buff the inside bladder of the tire in the area you just cleaned with the tire buffer.

    • 8). Apply a light coat of vulcanizing liquid to the buffed area. Allow a few minutes to cure.

    • 9). Return to the rim while you're waiting for the vulcanizing liquid to cure and replace the valve stem. Remove the valve stem from the rim using a valve stem puller. Cutting dikes also can work on most car tire valve stems by snipping the rubber seats off the valve stem and pulling them upward from the top of the rim. Inspect the rim around the inside and outside of the valve stem hole to make sure no rust or corrosion on the rim are present. Install a new valve stem using the valve stem puller until the rubber seat is secure in the valve stem hole.

    • 10

      Return to the tire and check the vulcanizing liquid. It should appear almost dry before inserting a patch-plug into it. Obtain the patch-plug and remove any protective covers from the top and rear of the patch-plug. Insert the metal guide of the patch-plug into the puncture from the inside bladder until you can see the guide poking through the external tread of the tire. Pull the guide through the puncture with a pair of pliers. The guide should feel tight and require some exertion to pull through, otherwise a larger patch-plug may be required.

    • 11

      Pull down on the external plug protruding through the puncture on the tread of the tire with one hand, while using the patch-plug roller to seal the patch against the vulcanizing liquid and tire bladder. The patch should seal to the bladder without moving. Move the roller up and down, then back and forth in all directions over the surface of the patch to ensure it is thoroughly affixed to the bladder with no small air pockets visible.

    • 12

      Cover the patch plug with an additional coating of vulcanizing fluid and allow to dry thoroughly.

    • 13

      Replace the tire on the rim, aligning the valve stem chalk mark on the sidewall of the tire to the new valve stem installed. Inflate the tire and check the patch-plug for leakage. Cut the plug down to the tread with a pair of cutting dikes. Check and adjust the balance of the tire using a tire balance machine.

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