Great Inventions . . .

The HeliCoil, invented by a smart German in the aeronautics industry, allowed the use of lightweight components (aluminum) to be used in engines.  The ability to meet torque specifications in aluminum with a corrosive resistant thread (stainless).  HeliCoils get a bad reputation because installers don't follow directions.
1. Use the proper drill size and tap
2. Always break off the drive tang
3. Finish with the new HeliCoil just below the surface
4. Use Loc-Tite (as recommended)
5. Never remove fastener when engine is hot (ie: spark plugs,
timing plugs, engine covers, etc . . . )
6. Readily available
HeliCoils are an effective (and very cost effective) fix to stripped threads.  Yes, there are many other products that you can argue are equal or better, IF installed correctly.  Most other inserts require a hole so large, that if it ever comes out - you are really screwed . . . (pun intended)
If I met this German in a hall, I'd buy him Weihenstephaner.


62 Ironhead said...

Hi Noot,

Agree Helicoils were a great invention and I have also tried the Keenserts as well. Gotta say fitting a helicoil is far easier in a tight area.

Here is a link to site which shows the installation method for a helical and also keenserts.



WhitelinePsycho said...

My '69 Bonnie was full of them in the end and they worked like magic, the factory shoulda used them from day one.