How To Change Your Spark Plug Wire

A spark plug is an electrical device inserted and fitted inside the combustion chamber, also called the cylinder head or distributor cap. The spark plug is responsible for the ignition of fuels turning into a motive power by creating an electric spark.

A spark plug is divided in several parts:

  • Center Electrode - The central electrode is made of a thick copper or nickel-iron and conducts electricity. This part is responsible for emitting the electrons because it is the hottest part of the plug.
  • Insulator - This part is made mostly of porcelain and surrounds the center electrode. It is responsible for providing support to the center electrode by insulating a high voltage.
  • Insulator Tip - The insulator tip protrudes to the combustion chamber from the center electrode. It is made up of Aluminum Oxide ceramic. This part is designed to have good thermal conductivity and can withstand 1,200 degree Fahrenheit and 60,000 volts.
  • Metal Case - The metal casing or the shell of the spark plug allows the spark plug to be connected and installed into a socket found in the engine's distributor cap. This part eliminates the heat from the insulator and passes it to the distributor cap, and thus, serves to be the ground for sparks during ignition.
  • Terminal - This is found on top of the spark plug and is attached to the ignition system.
  • Ground Electrode - This is made from high nickel steel, fused around the metal casing of the spark plug and is very hot when the engine is running.
  • Ribs - This part prevents the electricity from seeping from the terminal, metal case and insulator.
  • Seals - This part of the spark plug provides assurance that leakage from the combustion chamber will not happen.

Here are the steps to change your spark plug wires:

  1. Obtain a spark plug repair kit from an auto parts store. Make sure you also purchase a spark plug puller if it's not included in the repair kit.
  2. Open the hood of your car and locate the spark plug wires.
  3. Carefully wrench out the spark plug wire by carefully grabbing the underside of wire using the spark plug wire puller.
  4. Take the new wire and make sure that the replacement wire is the same length as the original one.
  5. Connect the new wire by attaching it to the distributor's cap.

The spark plug is an essential part of your engine's car and a faulty spark plug will surely keep your car from running smoothly. Because a spark plug is not a movable part in your engine, it can be long lasting and resilient to wear and tear, but careful examination of the wires every now and then, and changing them will make sure that your engine is in a healthy state.


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