icsamerica

In the case of spark plugs with a gasket its good practice to bottom them out and then go 1/2 a turn to partially crush the gasket to create a seal. Over the years I've worked on many car with spark plugs that were over tightened way too much. Also came accross plugs what were installed just 1 step above hand tight. This usually means they were installed the right way... bottomed out + 1/2 a turn. I think that's what he's advocating. The issue with this is you can only crush the seal once or twice and the zinc coating on the plug is damaged upon removeal, making these type of plugs single use if the instructions are strickly adhered too. Many home gamers like to remvove plugs and check them now and then, or may do for compression check or to just read the plugs. In this case you either have to install new seal, not practicle, or over tighten the plug so it will hold. In this case some zink based antiseize will be needed and the plug installed suficientyl tight so it wont back out.

For most cases Permatex 80078 Antizeize works. I've used it for decades with no illeffects. Sparingly,of course. It's mostly alu, graphite and copper. So universal that this stuff is the subject of internt meemes.

As for Boeing, it's hard to comprehend how bolts can loosen in such a catasptohic way. I've often seen safety wire used in aerospace and most of the aerospace stuff I've come in contact with is 50+ years old and in museums. The caliper and differential bolts on my Old Jags are safety wired and the rest of the car uses nylock nuts anywhere it's important.
Broadly speaking, as a society we seem to be in a de-eveolutionaly period. If one can accepct that then it can explain much of the crazyness we all can see each day. Last week I heard a company associated with NASA failed at launching a robot to the moon. A feet that was already accomplished releatedly 50 years ago. In both cases the afformentioned parties (Boeing and NASA) should know how to do what it is that they do... there is some technical regression here that is difficuly to comprehend. I could keep going... Voyager 1 a space craft launched in the late 70's is still operating, same goes for my 928 my 40 year old Craftsman's snow blower and 35 year old SubZero Refrigerator. Would any one expect anything they purchase today to still be operational or even usefull 35+ years form now? Is it to ineffcient to manufacture air planes with components that are properly secure with a manual labor process such as safety wire? Perhaps they were relying on some other form of locking agent such as a fluid thread locker. In any case it's regression and we can see this in every aspect of our "Modern Life". We're supposed to be better than what were in the past and in many case we're not.

For the past few years I've been taking my son racing with me to Limerock Park with my 80's Porsche towed behind my 70's motorhome and on the way back we stop off at 60's style duck pin bowling alley where you get a piece of paper and score the games you're self while having to press a variey of buttons to get the ball back and pins reset. Pure joy and good times always. In many ways life wasn't so bad in the past and modern life has made us loose sight of many things.

hacker-pschorr

Right from the box:

GUMBALL

In every car that I have prepared, I have always used the appropriate anti-seize. Then tightened them with a torque wrench to an adjusted setting.
That includes cast iron as well as several types of aluminum.

But, I have worked on customers cars where the plugs were installed "dry", and had a HUGE problem removing the plug without removing the insert as well.

Bottom line . . . . a little anti-seize goes a long way . . . so does COMMON SENSE . . . . . .

.

hacker-pschorr

I cannot find it printed anywhere, but I recall a long time ago (like 20+ years) when plug manufacturers started to say "no anti-seize" the original reason was folks would put on so much, getting some on the electrode, causing the plugs to fail.

Eliminating the anti-seize "fixed" that problem but created another. It's not NGK or Bosch's problem that your plugs are stuck in the head though.