<VV> Spark Plug Hole

[Mikeamauro at aol.com]

"...I've got a stripped spark plug hole that has so much metal  removed, 
the special Heli-Coil tap just slides in without making any thread for  the 
coil.? Anyone know of an alternative to having the hole welded up and  
re-drilled and tapped?? Thanks in advance..."
 
For "in the car" repairs, I've had good results using the KD Tools solid  
inserts sold by Clarks and a bunch of other folks. "Me thinks" (actually I'm  
pretty sure), the solid insert takes out more material than does a Helicoil 
(so  will likely work where a Helicoil will not). You'll need to also buy 
the  matching KD tap. Use lots of wheel bearing or chassis grease on tap to 
prevent  chips from falling into the cylinder. I think someone else mentioned 
the KD  insert, too, and that person is spot on; no, KD method is not as 
good as a  Time-Sert or Helicoil, but can be done W/O pulling the head. 
 
Mike Mauro