Troubleshooting: How to Remove a Glow Plug When It’s Broken

The biting chill of winter is a harsh reminder that your car’s engine relies on those small but mighty glow plugs to fire up in the cold. But what happens when one of those glow plugs decides to break off, leaving you stranded and frustrated? We’ve all been there, and it’s a situation that requires a little mechanical know-how and some patience. This guide will walk you through the process of removing a broken glow plug, helping you get back on the road and enjoying the warmth again.

Understanding the Problem: Why Glow Plugs Break

Glow plugs are essential for diesel engines, particularly in cold weather. They heat up the combustion chamber, making it easier to ignite the fuel and start the engine. However, over time, they can wear out or become damaged. Here’s why a glow plug might break:

• Corrosion: Over time, exposure to heat and exhaust gases can cause corrosion on the glow plug’s tip, making it difficult to remove.
• Over-tightening: Improper installation or excessive force during tightening can damage the threads and lead to a broken glow plug.
• Age and Wear: Like any other engine component, glow plugs have a limited lifespan. Eventually, they will wear out and need replacement.

Tools You’ll Need

Before you dive into the removal process, gather the necessary tools. Having these on hand will make the job smoother:

• Socket wrench set: You’ll need a socket that fits the glow plug’s hexagonal head.
• Breaker bar: A breaker bar provides leverage for loosening stubborn glow plugs.
• Glow plug extractor: This specialized tool is essential for removing broken glow plugs.
• Penetrating fluid (optional): Applying penetrating fluid can help loosen a stuck glow plug.
• Safety glasses and gloves: Always prioritize safety when working with tools and hot engine components.

Step-by-Step Guide to Removing a Broken Glow Plug

Now, let’s get into the meat of the matter. Follow these steps carefully:

1. Prepare the Engine: Make sure the engine is cold. A hot engine can cause burns. Disconnect the battery to prevent electrical shocks.
2. Locate the Broken Glow Plug: Identify the glow plug that’s broken. Use a flashlight and a mirror to inspect the glow plug’s condition.
3. Apply Penetrating Fluid (Optional): If the glow plug is stuck, spray some penetrating fluid around the base of the glow plug. Let it sit for a few minutes.
4. Attempt to Unscrew the Glow Plug: Use a socket wrench and breaker bar to try and unscrew the broken glow plug. Apply gentle pressure, and if it doesn’t budge, don’t force it.
5. Use the Glow Plug Extractor: If the glow plug won’t turn, it’s time for the extractor. Choose an extractor that matches the size and shape of the glow plug.
6. Attach the Extractor: Carefully thread the extractor onto the broken glow plug. Make sure it’s securely attached.
7. Remove the Glow Plug: Use the breaker bar to turn the extractor counter-clockwise, gradually applying pressure. Be patient; it may take some time to remove the glow plug.
8. Inspect the Cylinder Head: Once the broken glow plug is removed, inspect the cylinder head for any damage. If there are any damaged threads, you may need to have them repaired by a mechanic.
9. Install the New Glow Plug: Before installing a new glow plug, clean the threads and apply a small amount of anti-seize compound to the new glow plug. Tighten the new glow plug to the manufacturer’s specifications.
10. Reconnect the Battery and Test: Reconnect the battery and start the engine. Listen for any unusual noises or signs of trouble.

Preventing Future Breakages

Taking preventive measures can help you avoid future glow plug woes:

• Regular Maintenance: Follow the manufacturer’s recommended maintenance schedule for replacing glow plugs.
• Proper Installation: Ensure that glow plugs are installed correctly and tightened to the specified torque.
• Quality Parts: Use high-quality glow plugs from reputable brands.
• Avoid Overheating: Keep your engine cool by ensuring proper coolant levels and avoiding excessive idling.

When to Call a Professional

While removing a broken glow plug is a DIY project for many, there are situations where it’s best to call a professional mechanic:

• Extensive Damage: If the glow plug is severely broken or the cylinder head is damaged, it’s best to leave the repair to a mechanic.
• Limited Experience: If you’re not comfortable working on your engine, it’s always a good idea to seek professional help.

The Takeaway: Back on the Road and Ready to Roll

Removing a broken glow plug can be a challenging task, but with the right tools and a bit of patience, you can get your engine running again. Remember to prioritize safety, use the correct tools, and don’t hesitate to call a professional if you encounter any difficulties. By following these steps, you can conquer those cold mornings and keep your vehicle running smoothly.

What You Need to Know

1. How often should I replace my glow plugs?

Glow plugs typically last 50,000 to 100,000 miles. However, it’s best to consult your owner’s manual for specific recommendations.

2. What are the signs of a bad glow plug?

Common signs include difficulty starting the engine, especially in cold weather, rough idling, and a decrease in fuel efficiency.

3. Can I drive with a broken glow plug?

It’s not recommended to drive with a broken glow plug. It can lead to engine damage and potentially cause a fire.

4. Is it possible to replace a glow plug without removing it from the engine?

No, you’ll need to remove the glow plug from the engine to replace it.

5. Can I use a regular socket wrench to remove a glow plug?

While you can use a socket wrench, a breaker bar is recommended for extra leverage.