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Marine Spark Plugs & Boat Spark Plugs | ACDelco

ACDelco Specialty Marine Spark Plugs are great everyday replacement plugs designed for reliability and efficient performance in jet boats, inboards, outboards and personal watercraft. They can maintain stable operating temperatures under varying loads. The high-quality copper core and outstanding suppression characteristics deliver reliable performance.


Find out more about ACDelco OES Marine Spark Plugs and how they fit into the Ignition System with the product facts below.


A high-voltage spark from the ignition coil ignites the air/fuel mixture inside the engine’s cylinders.

Features & Benefits:

  • The thermal properties of the copper core provide great heat transfer and increase plug durability
  • Ribbed suppressor seal extends resistance and prevents spark “flash over” and misfire
  • Nickel-chrome-alloy sheathing helps prevent corrosion on center electrode


  • Signs of Wear & Troubleshooting:

    Signs that your spark plugs need to be replaced:

    • Engine has trouble starting, hesitates or cuts out.
    • Sluggish engine performance, loss of engine power or decreased fuel economy.
    • Lack of acceleration or loss of speed when driving uphill.
    • Cracks in the upper or lower portion of the spark plug insulator.
    • Chipped or broken insulator tip.
    • Damaged spark plug boot.

  • Did You Know:

    Most vehicle breakdowns are due to one of five causes:

    • Out of gas
    • Stalled/engine won’t start
    • Dead battery
    • Flat tire
    • Overheated engine

    Most of these breakdowns can be avoided through the following measures:

    1.Periodic mechanical checkups, especially when engine stalling, hard starting or other such symptoms are signaling trouble
    2.Seasonal checks and preventive maintenance of the cooling system, a frequent factor in roadside breakdowns
    3.Be sure the gas cap is on tight after filling up to safeguard against condensation in the tank. If moisture in the gas line freezes, the engine can stall.

    Also, having a cellular phone or portable CB radio is of great benefit while traveling.

  • What It Does:

    The Starting and Charging System starts the engine, maintains the battery’s charge and provides power to the electrical accessories while the engine is running.

Good Maintenance Practices:

It is important to inspect spark plugs at regular intervals for signs of deterioration. Follow these steps for removing spark plugs for inspection, servicing or replacement:

  • Grasp the spark plug boot and gently rotate it 90 degrees counterclockwise. Pull the spark plug boot and cable away from the spark plug. If necessary, use a spark plug boot removing tool. DO NOT grab or violently pull spark plug cables.
  • Use the correct deep socket size to loosen each spark plug one or two turns. NOTE: To remove spark plugs from aluminum heads, allow the engine to cool, because the heat of the engine, in combination with a spark plug that is still hot, may cause the spark plug threads to strip the cylinder head upon removal.
  • Brush or air blast dirt away from the well areas before removing spark plugs. CAUTION: Use goggles to protect eyes from dirt when applying compressed air to spark plug wells.
  • Remove each spark plug and place each one in a tray by cylinder number. This will help identify and relate any unusual condition to the cylinder involved.
  • Apply dielectric grease into the boot area to reduce the chance of exterior tracking on the buttress tower of the spark plug. This grease also promotes a good heat transfer between the spark terminal screw and boot terminal.
  • Before installing new spark plugs, use a gap guide to make sure your new spark plugs have the correct gap.
  • Check with your Owner’s Manual for the correct torque to apply when installing spark plugs.

  • FAQs:

    Does ACDelco have marine spark plugs?

    • Yes, ACDelco has spark plugs for marine applications.

    How often should I change my spark plugs?

    • That depends on the type of spark plug your engine requires. Please refer to your Owner’s Manual or contact your power equipment manufacturer.

    Should I change all of my spark plugs at the same time?

    • Yes, if it is the scheduled time for spark plug replacement.

    Are ACDelco spark plugs pre-gapped?

    • Yes. When ACDelco spark plugs are manufactured, they are pre-gapped to the correct gap specification.

    When I replace my spark plugs, should I also replace my spark plug wires?

    • Not always. Refer to your Owner’s Manual or contact your manufacturer.

    Can my engine conditions cause my spark plug to misfire?

    • Yes, certain engine conditions can cause oil, powder and carbon to collect on the spark plug, which then causes the plug to misfire. This is referred to as fouling.

    Should I change my spark plugs if pre-ignition is occurring?

    • Yes. Pre-ignition is when the spark plug is too hot and fires before the piston is in the correct position. This can cause serious damage to your engine.

    Can I just clean my spark plugs instead of replacing them?

    • No, ACDelco does not recommend cleaning and reusing your old spark plugs. Dirty, fouled plugs may also have broken, chipped insulator tips, worn electrodes, or worn or missing side wires. These conditions severely affect spark plug performance.

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