Spark plug threads and electrode positioning

[jiminbartow]

Does anyone use a thread sealer such as Teflon tape or Permatx thread sealeon their spark plug threads. I never used it before and my threads never leaked, but I just thought I’d ask. Just because I never did it does not mean it shouldn’t be used to preserve the threads in a very hot environment. Jim Patrick

PS. Also, I am adjusting the gap to .025. Where, on the center electrode, should the angled side electrode be positioned? Should the entire face of the angled side electrode be positioned next to the center electrode or a little above? I have the new style on the right.

[dobro1956]

I am no expert, but my grandpa taught me to make sure the side angled electrode runs "uphill"and on the side. That way any oil that collects on the electrodes will not run to the gap but away from the gap.

[TRDxB2]

The spark plug needs to be grounded to the head (Teflon tape may insulate) . Many discussions suggest using aluminum foil if its necessary to improve thread seal. First gap per manufacturers instructions - then if necessary to what others do to their unique motor. The X plugs gap to the side not the end of the center post.
The picture is from a previous discussion. The red tool is just to hold in position for t he photo. Most important the proper tool is being used to adjust the gap and it has the proper style wire to measure the gap.

[JohnH]

Prior to installing Champion X plugs, I used Teflon tape. No problem with it functioning as an insulator because the tape was cut through by the sharp threads. The Champion X's must have a different thread pitch or something to what I had before, because they seal tight without any tape..

[Steve Jelf]

What Donnie said. On both old and new style Champion X plugs the side electrode (cathode) angles up toward the side of the anode (center electrode). Incidentally, this makes them the easiest plugs to test.

[jiminbartow]

Has anyone ever used anti seize on the spark plug threads? It looks like, with a copper formula, it not only will lubricate and protect the threads in a high heat area, it will also aid in the conductivity between the spark plug and the head. Jim Patrick

[speedytinc]

I use the silver(aluminum based) anti seize on plugs & exhaust pipe nut. Its a product required for plugs into aluminum heads in the modern world.
It protects the head from stripping threads.

[TRDxB2]

Sounds like a good idea - lots of choices
CRC brand Grades
Silver Grade Anti-Seize is a general purpose, high temperature anti-seize lubricant for protecting metal parts against rust, corrosion, galling and seizure at temperatures to 1800° F. It is silver in color and contains copper, aluminum and graphite. Because of fine grade fillers, Silver Grade is particularly suitable for fine threaded and other closely mated parts. It is not recommended for applications where copper is prohibited.
Nickel Grade Anti-Seize is a premium anti-seize lubricant recommended for protecting metal fittings from rust, corrosion, galling and seizure at temperatures up to 2600° F. Formulated from nickel (20%) and graphite, Nickel Anti-Seize provides excellent chemical and oxidation resistance. It is recommended for high temperature, chemically corrosive applications and where the use of copper is prohibited.
Food Grade Anti-Seize is an aluminum complex based anti-seize which is specifically used in applications where incidental food contact is possible. Like Silver Grade, Food Grade Anti-Seize protects metal parts against rust, corrosion, galling and seizure at temperatures up to 1800° F. Food Grade meets NSF H1 requirements for incidental food contact.
Copper Grade Anti-Seize a combination of copper (10%) flake, graphite and other extreme pressure additives. Copper Grade Anti-Seize is copper in color and is not recommended for applications where copper is prohibited. Like Silver Grade, Copper Anti-Seize protects metal parts against rust, corrosion, galling and seizure at temperatures up to 1800° F. It is electrically conductive and does not compromise the integrity of soft metals.
Nuclear Grade Anti-Seize is a premium anti-seize that contains chemically pure nickel and offers superior protection against rust and corrosion. Nuclear Grade is contains no copper, lead, sulfur, halogens, or other ingredients that may poison reactor catalyst beds. Recommended for nuclear fittings, valves and steam mani-folds. Provides maximum protection from high heat up to 2600°F and aggressive chemicals. Nuclear Grade Anti-Seize meets General Electric D50YP12, Westinghouse and Bectel’s nuclear specifications and is tested to MIL-A-907E. It is formulated for use in Class 1, 2, and 3 non-wetted applications for auxiliary equipment in nuclear power plants.

Other Anti-Seize Types for specialty applications:
Nonmetallic compounds allow for exposure to high salt, humidity and generally marine environments. Suited for applications which utilize high nickel alloys and zinc coated fasteners. Nonmetallic Anti-Seize can be used to protect metal surfaces from corrosion related to exposure to the elements. Typically used in the offshore oil rigs and shipping industries.
Zinc Grade is for aluminum threaded components. Used to prevent seizing during assembly or disassembly of threaded or unthreaded components fabricated from aluminum or its alloys, engaged with components fabricated from similar or dissimilar metals. It is also intended to provide corrosion protection to the metal surfaces. This type is typically used in airplane manufacturing.