[summy]

Whether you DIY or visit Service Centers, customers can take advantage of GM Genuine Parts and ACDelco offers and promotions.
more

[whitewillows55]

Our entire portfolio has an exciting new look, designed to streamline the process of finding your perfect part. Want the details?
more

[dsg]

Independent Service Centers, Independent Body Shops, and Fleets can take advantage of various GM Genuine Parts and ACDelco offers and promotions.
here

[jrabbit]

Bring your vehicle to a GM Dealership or an ACDelco Service Center for maintenance.
more

[JustGamerS]

Is there a recommended interval for changing my vehicle’s spark plugs?
Yes, this interval depends on what type of spark plug your vehicle requires. Refer to your owner’s manual or contact your vehicle’s manufacturer for more information.

[psi36]

Should I change all of my vehicle’s spark plugs at the same time?
Yes, if it is the scheduled time for spark plug replacement. It is okay to replace one spark plug if it is fouled or damaged prior to scheduled maintenance, provided the source of the damage is found and corrected.

[mustvisit]

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

[robertsfran]

24 Month/Unlimited Mile Limited Warranty*: Our most common Parts Warranty offers coverage on the majority of our GM Genuine Parts and ACDelco service replacement parts. Effective on parts purchased April 1, 2018 and later to the original retail purchaser. Contact seller for limited warranty part details, qualifications, and possible labor coverage. more

[ChesterA321]

Center Electrode
Material: Nickel

[Olamaica1989]

AC Delco Specialty Marine Spark Plugs are 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. Their high-quality copper core and outstanding suppression characteristics deliver reliable performance.

[hvac001]

Specifications:
Shell
Thread Size: 14mm
Thread Pitch: 1.25mm
Seat Type: Tapered
Resistor: Yes
Resistor Value: 2-12K Ohm
Reach: 10.95mm (.43")
Hex Size: 13/16" (20.64mm)
Insulator Height: 0.98" (25mm)
Gap: .040" more

[epaulson]

Ground Electrode
Material: Nickel
Type: Single Prong Electrode
Shape: Taper Cut
Quantity: 1 more

[Maxalu]

here

[terese63tere]

here

[BlueSky]

Undoubtedly, due to the media blitz, you're probably aware of the recent arrival of the copper core spark plug to the marine world. Although a relative newcomer to automotive and marine power plants, they've been standard fare in aviation engines since the 1930's. Copper Plus spark plugs derive their name from the copper nucleus encapsulated inside the center electrode. And because copper dissipates heat faster than the normally nickel-alloy electrode, the heat range is broadened.

[esspe]

A Lisle spark plug gapping tool.

[komoto]

Taking the time to remove a marine engine's spark plugs and examining the firing surface and color of the deposit lends valuable clues as to the general state of affairs inside the combustion chamber. When the firing end of a spark plug is brown or light gray, its condition is good and the spark plug is functioning optimally. Perform this exam as routine maintenance, even when the engine is running fine. But in the real world, folks procrastinate and it's most often done as a last result when if something is amiss, like rough running, stumbling or poor acceleration, degraded fuel economy or a cloud of smoke out the exhaust. here

[SceneSite]

There are many possible causes for dry carbon or wet carbon fouling. Damp, or wet black carbon fouling is caused by a too cold of a heat range plug, or by prolonged trolling, hour after hour after hour. Other possibilities are the carburetor is adjusted too rich, or on a two-stroke outboard, when pouring too much oil in with the gasoline. Weak spark could also be the culprit. Black, oily deposits on the electrodes and insulator tip points to an oil-fouled plug. Oil could be leaking into the cylinders, getting past pistons that are worn or valve guides that are worn. Finding the source of the leak is very important. Consult a mechanic for guidance. Once the problem is addressed, you can replace the spark plug.