How do you get a stripped out spark plug out?

A stripped spark plug can be very frustrating to remove. However, with some patience and the right tools, it is possible to get a stripped spark plug out without causing further damage. Here are some quick answers to common questions about removing stripped spark plugs:

What causes a spark plug to become stripped?

The most common causes of a stripped spark plug are:

• Over tightening – Using too much torque when installing the spark plug
• Cross-threading – Not properly aligning the threads when installing the plug
• Corrosion – Rust and corrosion can cause the threads to degrade over time
• Old age – Spark plug threads can wear out after many years and high mileage

What tools do you need to remove a stripped spark plug?

Having the right tools makes removing a stripped spark plug much easier. Here are some recommended tools:

• Spark plug socket – A quality 6-point socket helps prevent further damage
• Rubber band – Placing a rubber band between the socket and stripped plug can help grip
• Penetrating oil – Applying penetrating oil for several hours before attempting removal can help loosen the plug
• Breaker bar – A breaker bar provides extra leverage to break the plug free
• Spark plug tool set – Specialty tools like thread chasers and grips can also be useful

What methods can be used to remove a stripped spark plug?

There are several methods that can be attempted to remove a stubborn stripped spark plug:

Socket and Breaker Bar

Using a quality 6-point socket with a breaker bar is often effective at breaking the spark plug free. Apply steady pressure and avoid sudden force. The breaker bar provides extra leverage.

Impact Wrench

An impact wrench delivers quick bursts of torque that can jar the plug loose. Use caution to avoid snapping off the plug in the cylinder head.

Hand Extractor Tools

Specialty hand tools like grip pliers and thread chasers are made to remove stripped plugs. They grip and bite into the damaged threads.

Helicoil Thread Repair

If other methods fail, a helicoil insert can be installed to rethread the spark plug hole, allowing for easy removal.

Step-by-Step Instructions for Removing a Stripped Spark Plug

Follow these steps for the best chance of removing a stripped spark plug intact:

1. Disconnect the spark plug wire and remove any debris around the spark plug.
2. Apply penetrating oil on and around the spark plug. Let it soak for at least a few hours.
3. Carefully insert a 6-point socket over the stripped spark plug. A rubber band can help grip.
4. Attach a breaker bar to the socket for extra leverage. Apply steady, firm pressure on the breaker bar.
5. Rock the breaker bar back and forth slowly to help break the plug free. Don’t force it.
6. Once loose, completely unthread and remove the spark plug. Be ready to catch it when it releases.
7. If the plug cannot be removed by hand, use an impact wrench or specialty hand tools.
8. As a last resort, install a helicoil insert to rethread the hole and remove the plug.

Tips for Avoiding Stripped Spark Plugs

Here are some good practices to avoid having to deal with stripped spark plugs in the future:

• Use the proper torque spec when installing spark plugs to avoid over tightening.
• Always thread spark plugs in by hand first before using any tools.
• Ensure the threads are properly aligned before installation.
• Use anti-seize lubricant on the threads to prevent corrosion and sticking.
• Inspect spark plugs at regular intervals and replace worn plugs.

Conclusion

While removing a stripped spark plug takes patience and care, it can be accomplished with some perseverance and the right tools. Using penetrating oil, a quality 6-point socket, breaker bar and specialty hand tools, most stubborn spark plugs can be removed intact. Following proper installation and maintenance procedures can help prevent stripped plug issues in the first place.