<VV> Repairing a failed crankcase stud thread repair

[ScottyGrover at aol.com]

In a message dated 5/8/2008 9:06:52 P.M. Pacific Daylight Time,  
BobHelt at aol.com writes:

In a  message dated 5/8/2008 8:49:42 PM US Mountain Standard Time,   
dougmackintosh at yahoo.com writes:

Some  miscreant apparently  repaired this one with a short (7/16 long) 
helicoil,  which has  pulled completely out of the block. From what I have 
read it 
looks   like a 0.75 long Big-Sert is the best fix for this. 

Is that right? And  where can I obtain the part and tool (preferably   
rental).




Hi Doug,
Many opinions here. But IMHO, if the  Helicoil really pulled out you will  
not 
be able to use a timesert or  even another Helicoil. I am not familiar with  
Bigsert so that may  work but be sure it is large enough in diam. Otherwise 
You  
must go  to a special insert which you can buy from Larry Claypool or make   
yourself from a 1/2 -13  bolt by cutting the head off and tapping  the  
inside of 
the bolt to 3/8-16. There are other inserts you can  buy but they are  HARD 
to 
find, say, EZ-loc or Keensert or K-sert.  Get one from Larry  instead.
Regards,
Bob  Helt




I had the same thing happen to me many years ago; I used a 3/8-16--when I  
torqued down the head, it came apart.  So I drilled and tapped for a  1/2  NC; 
same thing.  I kept using larger and larger bolts; same  thing.  I finally went 
to a new crankcase.
 
Scotty from Hollyweird



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