Tune-up time : spark plugs

[Snakebitten]

Quite a few years back we had a spark plug seize in an aluminum head at 60,000 miles or so. The threads stripped out and we had to have a heli-coil put in.

No way I'll run to 100,000 without changing the plugs.

Since then all of my spark plugs have been changed early - with anti-seize compound on the new plugs.

Good reasoning, in my opinion.

There are some types of maintenance that I don't consider frequency or intervals based on what's the longest I could wait.

The Ecoboost is definitely a motor that I'm not waiting until Ford's recommendations or any symptoms present, before I change plugs. Besides, it's one of the easiest modern motors to change plugs on, so nothing to avoid.

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[Gros Ventre]

Torque specs are always for dry, unlubricated threads. When any kind of lubricant, and thread anti-seize qualifies, is used, reduce the applied torque by 25%. In engineering worlds that is standard practice...

 

[EricR]

Torque specs are always for dry, unlubricated threads. When any kind of lubricant, and thread anti-seize qualifies, is used, reduce the applied torque by 25%. In engineering worlds that is standard practice...

So this would apply to loctite as well?

 

[Gros Ventre]

Yes, the loctite, and other thread lockers, is a liquid and takes some time to setup. Before it sets up it then lubricates the threads being joined.

 

[Traildozer]

What's that plug part no:?

 

[gb7FRz26]

What's that plug part no:?

I'm not OP but looks like Motorcraft DG-584. As cheap as $15 online, suspiciously low. But.. $23.45 MSRP on Ford's own website, and has pics. Neat.
https://parts.ford.com/shop/en/us/engine/engine-electrical/ignition-coil-13284813-1
Edit: I looked up the 3.5 L EcoBoost non-hybrid on a 2021.

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