The Tools Needed to Change Your Spark Plugs

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Changing your spark plugs for the first time and not sure what you’ll need? We’ve got you covered. We’ve put together a list of the exact tools needed for a successful install.

Keep reading below to find out about each item on the list.

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Spark Plugs

The first and most obvious things you will need are the spark plugs you’re planning to install. As is often the case, different machines will require different types of spark plugs. So be sure the ones you are purchasing are a match by cross-referencing their manufacturer part number with the model of your machine.

Spark Plug Sockets

Though you can technically use any socket of the right size, we recommend using the kind specifically made to pair with spark plugs. These special sockets contain rubber isolators inside intended to absorb any possible vibration within and protect the glass featured along the spark plug.

Regular sockets do not contain the rubber feature and using them may result in breakage when attempting a spark plug replacement.

Ratchet and Socket Extensions

Regardless of the socket used, you will need a standard ratchet wrench to fully remove the spark plug. And due to their location on certain machines, you may also need one or more socket extensions on hand in order to successfully access those hard-to-reach spaces.

Spark Plug Gap Gauge

Despite often being overlooked, the spark plug gap gauge is arguably the most important tool on this list. It measures the gap between the middle pin and the uppermost electrode, both found at the tip of all spark plugs as seen here.

Know that different machines will require different gap measurements for their spark plugs, so always be sure to reference your owner’s manual to determine the correct measurement for your machine.

If you find the adjustment is not correct, you can also use the gauge to adjust the gap size as needed. To do this, thread the electrode through the hole found on the tool to pry the pin up and widen the gap or use the thicker end to push the electrode down. Similarly, you can narrow the gap using the thicker end to push the pin down.

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For more information on how to use these tools to install a spark plug, check out our YouTube page where you’ll find hands-on installation videos and more. Leave a comment or question and receive a personal reply from Brent himself, our resident John Deere expert. Be sure to like and subscribe!