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It looks like maybe to me? i realize it is a bit dirty with antiseize etc and it is just a cheap wifi boroscope picture. This is #4 on my engine, and the only plug that seems to keep loosening up? never been so loose it has blown out In the 6k I have owned it, but it was the only cylinder with a newer coil and plug when i purchased the truck.
I did plugs a little over 1k ago and i have checked them twice at 500mi intervals. initially torqued them all to 22.5fl/lbs, first recheck upped torque to 28ft/lbs, and rechecked 1-5 again yesterday, this one took a few degrees to get the click but the others just clicked with no movement.
if it has been "fixed" and it is loose again in another 500 miles, then what? 2000 6.8L btw
With the anti-seize on it, I can't tell if those threads are aluminum or steel. If you have one of those magnetic pickup tools with a thin long handle, you might want to see if a magnet will stick. If so, it's been repaired.
However, It does almost look like there's an insert there. Again, can't really tell. If you look at the metal just outside the tapered seat, it has the same color "patina" that the rest of the head has.
Since a 2000 v10 should only have 4 threads for the plug holes, I would say it is an insert. It looks like something other than the casted plug threads that would be there stock. With the problems you are having with the plug backing out, I would predict it is an insert of some sort.
looks like maybe the Calvan version as it looks like maybe JB weld'd in??? i can't seem to find anything that tells me torque to use for that insert, which may be why is is loosening up? there is that one spot on the top, looks like a spot weld (i'm sure it not) but it has that look. could that be preventing the plug from seating? then again i don't have a ticking sound currently, i did which is why i keep checking it.
this is the best i could clean it up today, retorqued it to 30ft/lbs w/o antiseize, seems excessive and maybe it was.
when i check again in a few hundred miles i plan to pull the rest and clean everything up good and reinstall them dry. hopefully this one will stay tight
very very carefully. Because if any of the slag falls into the hole then it will scratch up your cylinder walls and other parts. Could become catastrophic.
Just an idea....IF you could find a threaded plug to plug the hole.....I have a dremel adapter that is a flexable shaft....IF you could find one that is small enough to fit into that plug hole, you could use a dremel bit that is rounded at the end to grind on that piece of slag and maybe smooth out the seating surfcace. Then you could vacuum out the hole before removing the plug. Not easy at all. Lots of ifs......
Just an idea....IF you could find a threaded plug to plug the hole.....I have a dremel adapter that is a flexable shaft....IF you could find one that is small enough to fit into that plug hole, you could use a dremel bit that is rounded at the end to grind on that piece of slag and maybe smooth out the seating surfcace. Then you could vacuum out the hole before removing the plug. Not easy at all. Lots of ifs......
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