Spark plug replacement requires a spark plug socket and extension which fits onto a ratchet. This socket is lined with a rubber grommet to protect the porcelain insulator of the spark plug and to hold the plug while you remove it. You will also need a wire-type feeler gauge to check and adjust the spark plug gap and a torque wrench to tighten the new plugs to the specified torque.
Tools required for changing spark plugs are:
1 Spark plug socket - This will have special padding inside to protect the spark plug porcelain insulator
2 Torque wrench - Although not mandatory, use of this tool is the best way to ensure that the plugs are tightened properly
3 Ratchet - Standard hand tool to fit the plug socket
4 Extension - Depending on model and accessories, you may need special extensions and universal joints to reach one or more of the plugs
5 Spark plug gap gauge - This gauge for checking the gap comes in a variety of styles. Make sure the gap for your engine is included