How to Safely Remove a Broken Spark Plug from a 2011 BMW 335i

QuestionsCategory: Ask An ExpertHow to Safely Remove a Broken Spark Plug from a 2011 BMW 335i
James Thomas asked 5 months ago
I'm facing a challenging situation with my 2011 BMW 335i. The spark plug has sheared off and is now stuck in the engine, with the electrode and core still embedded. I'm seeking advice on the best way to remove this broken spark plug without causing further damage to the engine. Any suggestions would be highly appreciated!
1 Answers
Zack Norman Staff answered 5 months ago
Hi there, James! I see that you're in a spot of bother with your BMW 335i, but don't worry, I've dealt with something like this before, and it's actually easy to fix! Removing a broken spark plug can be a delicate process, but with the right approach, it's more than manageable enough. Here's a step-by-step guide:
  1. Assess the Situation: First, determine how much of the spark plug is broken and what parts are still accessible.
  2. Tools Needed: You will need a screw extractor (like an Irwin spiral screw extractor), a punch, a hammer, a magnet, and potentially a torch.
  3. Removing the Broken Pieces:
    • Use the punch to carefully tap the electrode and porcelain into the cylinder (we'll retrieve these later).
    • Gently tap the screw extractor into the threaded portion of the broken spark plug and try to reverse it out. If it doesn't move, avoid forcing it.
    • If necessary, apply some heat to the threads with a torch to loosen them, then try the extractor again.
  4. Inspect and Repair Threads: Once the broken part is out, inspect the threads for any damage and repair if necessary.
  5. Retrieving Debris: Use a magnet to fish out the electrode and larger porcelain pieces from the cylinder.
  6. Clearing Remaining Debris: Briefly start the engine to eject any smaller porcelain pieces from the spark plug hole.
  7. Install a New Spark Plug: Once everything is clear, install a new spark plug.
Remember, if you're not confident in performing this procedure, it's always best to consult a professional mechanic. Good luck, and feel free to reach out if you have any more questions! Zack - Motor Verso Mechanics Team