How long should I wait after driving before swapping plugs?

 

My tech told me to be sure to NOT let the block completely cool down when removing them

I had an issue after the new head (8+ threads) installed, I couldn't remove a single plug on that side. He told me to do it when the block is still warm (not hand burning to the touch).


Take it for whatever it's worth.

 

THAT’S WHY FORD DEALERSHIPS SHOULDN'T CHANGE PLUGS

Max I know that is "his words", please take no offence
But everyone says to do it ICE COLD

It's bad enough we have two diff metals expanding and contracting at diff temps, (that might actually explain his theory)
but doing it hot will now give you the possibility of putting ice cold
"contracted Plugs", in a hot "expanded hole",
THIS IS NOT A GOOD COMBO

I'm on my 3rd set, I leave it parked overnight, and do it ICE COLD

 

:o

 

OR SOMETHING like that

 

..... well I cant leave it all night, I was hoping you would say and hour or something...Im doing it at a friends house

 

Haven't changed the plugs on my L yet, but theres no way I'd ever change the plugs on ANY vehicle unless it was ice cold, ie, sat overnight.

 

Thanks - I'm glad I don't think I'm crazy now for doing it on a "room temperature" block... I've never changed plugs on an aluminum cylinder head with the block warm...

It probably didn't help that he may have OVERTORQUED them down when installing