<VV> Upper Head Stud - Help!

[Dale Dewald]

In a message dated 8/25/2010 1:54:56 P.M. US Mountain Standard 
Time,  jay.pitchford at gmail.com writes:

 >>snip<<
>.My mechanic put 1/2"  heli-coils in the spun and pulled holes mentioned
>above, but he tried to  re-use the original stock studs with Locktite.
>He ended up pulling both  heli-coils back through and stripping the
>threads in the pulled stud  hole.
>

At 09:06 8/26/2010 -0400, Bob Helt wrote:
>Hello Jay,
>
>There are several mistakes you are making.

 >>snip<<
>Now when an insert pulls out like your did, you MUST get an oversize
>insert. The quickest way probably is to contact Larry Claypool and get 
>them from
>him. What he is going to provide is essentially, a 1" long 9/16" bolt that
>has  the head removed. This "bolt" will have a 3/8" hole drilled thru it and
>tapped  for a head stud. To install, you will tap the hole in the block
>with a coarse  9/16 tap. Use loctite to prevent oil seepage. You may have to
>run a die over the  case end of the stud to make it fit the insert.

Having recently repaired five top studs in our Greenbrier's engine, 
including one that pulled after having  been Helicoil'ed with a 1/2" 
insert, I must emphasize Bob's last sentence. MAKE SURE to run a standard 
size die over the stock head stud threads before threading it into the 
Helicoil or other insert.


Dale Dewald
Hancock, MI