How to Deal with a Spark Plug Electrode Falling into the Cylinder?
2 Answers
If the electrode of a car's spark plug falls into the cylinder, the solution is to repair or replace the spark plug promptly. Steps to replace the spark plug: Open the hood, lift the engine's plastic cover, remove the high-voltage distributor wires, and mark each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for external debris like leaves or dust and ensure everything is cleaned thoroughly. Place the new spark plug into the spark plug hole, hand-tighten it a few turns, and then use the socket to tighten it further. Reinstall the removed high-voltage distributor wires according to the firing order, and then secure the cover. Spark plug replacement interval: Under normal maintenance conditions, spark plugs should be replaced every 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type, so it's recommended to follow the owner's manual. Below are some general guidelines for maintenance replacement: Platinum spark plugs should be replaced at 40,000 kilometers, standard nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000 to 80,000 kilometers.
I've encountered a similar situation before. It's indeed quite troublesome when the electrode tip of a spark plug falls into the cylinder. The most crucial thing is not to start the engine again, otherwise the electrode tip will bounce around inside the cylinder, potentially scratching the cylinder walls at best or even piercing the piston at worst. You must immediately call for a tow truck to take it to a professional repair shop, where technicians can use an endoscope to locate the electrode through the spark plug hole. If you're lucky and it's stuck at the top, it can be retrieved directly with a magnetic tool. However, if it falls below the piston, you'll likely need to remove the cylinder head, which is a significant job and also requires replacing the cylinder gasket. During the process, it's also necessary to check if the valves have been damaged. I've seen cases where people tried to save trouble by driving anyway, only to end up spending tens of thousands on a major engine overhaul—definitely not worth it.
