how to fix a stripped spark plug hole

Are you sick of repairing your car’s torn spark plug hole? You’re not alone so don’t worry. This annoying problem has, at one time or another, plagued many car owners. Spark plug holes that have been stripped can cause engine misfires, decreased fuel efficiency, and even cylinder head damage. But don’t worry! We’ll walk you through how to fix a stripped spark plug hole like a pro in this post. So, gather your tools and get ready to put an end to that annoying issue.

How to fix a stripped spark plug hole

Required Equipment

For fixing stripped spark plug hole you need some tools.

  • Socket set with spark plug socket
  • Ratchet wrench or spark plug wrench
  • Gap gauge
  • Torque wrench
  • Thread chaser or tap and die set for fixing stripped threads
  • Anti-seize compound
  • Wire brush
  • Compressed air to blow away any debris

Step 1) Using a socket wrench, carefully remove the stripped spark plug from the hole.

Step 2) After cleaning the hole’s threads, check for damage or debris.

Step 3) To rethread a hole that has been slightly stripped, use a larger spark plug and a tap and die set. Make that the new spark plug’s size and pitch match those of the tap and die set.

Step 4) Use thread locker to make sure the new spark plug, and hole is well sealed.

Step 5) Using a torque wrench and the new spark plug as directed by the manufacturer, insert it and tighten it.

Step 6) Before starting your engine, double-check forappropriate seating and torque.

Can you spray wd40 in spark plug hole

The answer is yes, although it is not advised to spray in spark plug hole with WD40. Although WD-40 is an effective lubricant with a variety of uses and can aid in de-rusting objects, it is not intended to be used in place of regular spark plug maintenance. The application of WD-40 in the spark plug hole can really do more harm than good.

How much does it cost to fix a stripped spark plug hole

Depending on the type and model of your car, the cost to get it serviced by a mechanic could be anywhere from $100 to $500. The cost of labor and any other components that might need to be changed are included in this amount. However, there are DIY choices available at a fraction of the cost if you’re adept with tools and have some mechanical knowledge. One well-liked technique involves utilizing an insert kit, which costs between $20 and $50 and enables you to repair the threads in the spark plug hole yourself.

What causes spark plug to strip out?

  • The threads may peel out if the spark plug is installed with too much force. When inserting a spark plug, it’s crucial to adhere to the manufacturer’s specified torque specifications.
  • Stripped threads can also result from cross-threading, which happens when the spark plug is pressed into position despite not being correctly aligned with the cylinder head. This could occur if you install the spark plug carelessly and unintentionally apply sideways pressure that causes the spark plug to be out of alignment.
  • The threads may strip out if a hot or seized spark plug is removed before it has had time to cool. The metal of spark plugs swells at high temperatures, making removal more challenging. Forcefully attempting to remove a hot or stuck spark plug can ruin its threads.


Finally, repairing a stripped spark plug hole is a simple procedure that can help you save time and money. You may effectively repair the damaged threads and guarantee that your spark plug is operating properly by following the instructions provided in this article. To prevent inflicting more damage, always be cautious and take your time when performing repairs. It is always preferable to seek advice from a qualified mechanic if you are unclear about any stage or run into problems. Act right away and go back on the road with confidence to enjoy the performance of your engine despite a stripped spark plug hole!


How can I tell if the hole in my spark plug is stripped?

The spark plug may be difficult to remove, feel loose or unsteady when tightened, or cause excessive vibration and engine misfiring.

Can a stripped spark plug hole be repaired?

Yes, fortunately, it is possible to fix stripped spark plug holes without completely replacing the cylinder head.

What are some temporary fixes for a stripped spark plug hole?

A threaded sealant or an enlarged spark plug with a rubber gasket can be used to temporarily repair a stripped hole. But you should only think of these as temporary fixes.