Heli-coil installation, 1 or 2?

[RKwood]

I picked up a heli-coil kit to replace a stripped mounting hole (one of the six long bolts)in my block.<br /><br />A single heli-coil looks like it will only cover less than half of the threads of the bolt.<br /><br />The instructions with the kit indicate "add aditional inserts for increased length applications"<br /><br />Has anyone ever used two? Do I need two?<br /><br />Although not indicated in the directions, I am considering using a thread locker (loc-tite) for the heli-coil. I've gotten mixed opinions on the use of the thread locker with the heli-coil, and I am looking for some feedback here.<br /><br />Last but not least, any tips on snapping of the tang? I have a steel rod thats a close fit to the inside of the coil. Just insert rod and hit with a hammer?<br /><br />RKwood

 

[speedwrench]

Re: Heli-coil installation, 1 or 2?

Finally, something I know something about (Force engines not being one).<br />Heli-coil length the diameter of the bolt will give you full strength. Having said that, if two makes you feel safer, do it. They are cheap.<br />I locktite mine in if it is where they get disassembled fairly often. Otherwise no. If you use two and/or use locktite run a tap thru before assembly.<br />The tang is easy to knock off with your bar or a screwdriver or what ever. Blow the broken tang out with air after you break it. (safety glasses!)

 

[jim dozier]

Re: Heli-coil installation, 1 or 2?

A magnetic screwdriver will remove the tang easily once its been knocked off.

 

[RKwood]

Re: Heli-coil installation, 1 or 2?

Two won't fit anyway! The hole in the block is only deep enough for 1.<br /><br />One worked like a charm, end up applying a small amount of red threadlocker.<br /><br />Thanks to all for the info.