97 4.6, w vin, non coil over plug, I am getting ready to pull the plugs on this engine for the first time ever in its life, 83,000 miles . It seems to be a wide variance in removing plugs with engine hot, or removing plugs engine cold. I assume it is because of aluminum head. Previously I have removed plugs in other aluminum heads both cold and warm from hot. Never had a problem either way, but they were not ford engines. Any advise would be appreciated regarding removal. Thank you. :

 

Always do plugs on a cold engine with aluminum heads.

 

always cold on aluminum heads

 

You take them out hot and you could have galling issues between the aluminum and the steel. this is what f's the threads up on an aluminum head. Just do a quick search for aluminum galling online and you will get the idea.

ken

 

Bingo! What he said. Cold Motor!