Mercury AGSF-32Y-PC Spark Plug

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Check the gap by inserting the proper-thickness gauge between the electrodes at the tip of the plug. Adjust the gap using the adjuster on the gauge body if necessary. Be very careful not to crack or chip the porcelain insulator surrounding the center electrode.

It's crucial to install the spark plug wires in the correct order, starting with the number one cylinder, which can be identified and labeled for clarity.

When replacing spark plugs, it's essential to apply silicone dielectric compound to the inside of each spark plug wire boot and terminal before reconnecting them. You'll need a spark plug socket, ratchet, extensions, and a gap gauge for the task, ensuring the new plugs have the correct gap and type for your engine. Allow the engine to cool, then check and adjust the gap on the new plugs. Remove the spark plug wire from one plug, using a removal tool if available. If applicable, disconnect the electrical connector from the spark plug's individual coil on certain engine models. Use compressed air to clear debris from the spark plug hole, preventing foreign material from falling into the cylinder. Remove the old plug with a spark plug socket and compare it with a chart to assess the engine's running condition. Apply anti-seize compound to the threads of the new plug and thread it into the hole, using a length of rubber hose as a tool to prevent cross-threading. Before attaching the spark plug wire, inspect it, and then connect it to the new spark plug. Repeat this process for the remaining spark plugs, replacing them one at a time to avoid mixing up the wires.

Periodic inspections are vital due to the belt's susceptibility to wear.