That's because you're are using heli-coil style inserts. Which is also what you have pictured. Don't use those, nothing but trouble.

There's the 14mm, Big Sert and triple oversized kits on the market. Not sure if Cal Van has the triples, Time Sert does.

 

Are you saying that the thing in his picture is a wire insert? He should be able to peel it off easily then. How can a person have that thing in front of them and not have taken it apart already?

https://www.stanleyengineeredfasteni...ptia/heli-coil

 

Heli coil kits use solid barrel inserts and wire/coil kits as well. Wire/coil can't be used for this repair, won't work at all. Not enough threads in the chamber for that style.

Heli coil solid inserts dimple at he top to secure...which isn't permeate. Those things won't even work on weed eaters lol.

The quantity kits have much better serts, lipped at the top.

 

I guess what I'm saying is that the picture the OP provided does not look like a wire insert. Not clear why mbb implied that it was. The OP said that it was solid. He didn't say what the mechanic gave him.

Seems like the word "helicoil" has spun this discussion off on a tangent. Whatever he started with worked for many miles. The problem is that it came out with the plug.

p.s. it's not hard to imagine a PO using an insert with no thread locker, just planning to move the insert over at the next plug change. Mechanically, it's just two threaded holes. Not saying it's a good idea, just saying it's not completely illogical.

 

mbb was correct, the OP wasn't aware that Heli-coil manufactures more than one type of kit. Not limited to wire coil type alone, they do solid sert kits as well...which are the kits that fail.

The correct thread locker needs to be used (Timesert 6020 locker/sealer) BUT, but should be used with quality inserts. Not Heli-coil. - Time Sert or Cal -Val inserts.

Loctite also has the correct locker/sealer under their name.

 

You guys looked at those out of focus pictures of a crusty insert and could tell that it was a Helicoil (TM) solid insert? And you're both saying that Helicoil (TM) solid inserts are crap. Even though his lasted many miles.

Just looking for clarity. I know that the wire inserts have a bad name. but assume that's why they developed a solid one. But, really, I just want to hear somebody say that they can tell the brand of the solid insert from the picture. And that they know that the unnamed insert that was used was a Helicoil. The first part seems like a maybe, but the second part...there's nothing to go on except that it wouldn't torque down.

To the OP - if you could not get the insert to tighten there's no point in waiting for the threadlock to cure.

 

Because that is not what was on the plug, not what is shown in the pic.

 

Easy to remember, - anything that says Heli coil on the plug repair kit will fail eventually. Their solid insert repair kits are the kits that tear up the head thread chambers inside of two years, they can make un fixable. Don't use these kits. The damage can be extensive enough that a quality Big sert or Oversized sert kit can't fix it.

Do it correctly to at first....from the start.

That should be plenty clear lol.

 

My thinking on that was that if the threadlock cured, the insert might not back out when I removed the plug. If it does not back out, seems like that would be same as it being tight.

 

Correct