How to Replace a Tire Valve Stem Core

Replacing a valve stem core saves time and money.

While replacing valve stem cores will fix a slow leak in a tire, it is also a good idea to replace them as part of routine maintenance to extend the life of your tires. This helps prevent underinflated tires, which reduce gas mileage and will cause tires to wear out more quickly. It's a fairly simple job that doesn't cost much, only takes a few minutes, and doesn't require a car expert to perform.

Things You'll Need

• Soapy water
• Tire pressure gauge
• Jack
• Valve stem replacement
• Valve stem tool
• Compressed air or air pump

Instructions

1. Check to see if the core is operating properly. Remove the cap from the valve and apply a small amount of soapy water to the stem. If air bubbles appear, the core is leaking and needs to be replaced. If there are no bubbles but the tire continues losing air, the tire has a different defect.

2. Jack up the vehicle on the side with the leaky stem core.

3. Deflate the tire by fitting the tire pressure gauge over the valve and pressing down.

4. Remove the valve stem core using the small, slotted end of the valve stem tool. Turn the tool counterclockwise until the core comes out. A small amount of air may still be escaping.

5. Insert the new valve stem core in the valve. Slowly tighten the new stem by turning the tool clockwise. Do not overtighten, as this can cross-thread the valve stem and lead to a more costly repair.

6. Reinflate the tire. Use the pressure gauge to inflate the tire to the recommended pressure, found on the sidewall of the tire.

7. Replace the stem cap and lower the jack.

Tips & Warnings

• Do not remove the core while the tire is inflated. Rapid deflation can cause the tire to rupture or the core to blow the out, potentially causing injury.

References

• Cars Direct: How to Repair a Tire Valve

Resources

• Tire Tech: Tire Valve Stems