How to Replace a Spark Plug Terminal Stud

Using a brush to clean a spark plug
  • 1 hours
  • Beginner
  • 0-50
What You'll Need
Adjustable wrench
Spark plug terminal stud

A spark plug terminal stud is just one of several pieces that make up the spark plug. Many people think the spark plug is just one unit, but the piece that plugs into the block of the engine is called the spark plug terminal stud. The spark plug terminal stud is fashioned from mild steel. This is to reduce the amount of heat that passes through the spark plug. The article below will show you how to replace a spark plug terminal stud.

Step 1 - Remove the Spark Plug

Open the hood of your car, and locate the spark plug. Remove the wire attached to the top, and then unscrew the spark plug.

Step 2 - Remove the Spark Plug Terminal Stud

row of spark plugs

The spark plug terminal stud is on the bottom of the spark plug. Put the spark plug in a vice to hold it steady. Grip the nut with the wrench, and then twist it to the left until it is loose. Remove it by hand.

Step 3 - Replace the Spark Plug Terminal Stud

Place the new stud where the old one was. Screw it in place by hand, and then finish tightening it with the wrench. You can now replace the spark plug.