If I remember correctly, four threads are all that is required to achieve
the rated strength of the bolt.

Jim

On Wed, Jun 16, 2010 at 8:33 PM, pickle vanagon <greenvanagon@gmail.com>wrote:

> Keen-sert probably would have been good too, but I did the helicoil
> installation today.  That metal is thicker than it looks... a standard
> length M8 helicoil insert would fit (though I clipped one turn of mine just
> in case, because I misjudged the length).
>
>
> Now I have a 13mm bolt back in place and it holds tight.
>
> I was shocked at how easy this was.  The whole job took 10 minutes, not
> counting the time to put the van on ramps to give myself more space to
> work.  These inserts are impressive.
>
> Now I have 4 tight bolts back in place.
>
>
>
>
>
> On Wed, Jun 16, 2010 at 12:57 AM, Dennis Haynes <d23haynes57@hotmail.com
> >wrote:
>
> > That plate really is not a good candidate for a helix-coil, not thick
> > enough. A solid insert such as a keen-sert would be a better choice. You
> > can
> > also drill another hole close by and tap it for the 8mm thread. Be sure
> to
> > use the proper hardware here, PC 10.9 and those thick through hardened
> > washers were used for a reason.
> >
> > Dennis
> >
> > -----Original Message-----
> > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of
> > pickle vanagon
> > Sent: Monday, June 14, 2010 8:46 PM
> > To: vanagon@GERRY.VANAGON.COM
> > Subject: noise SOLVED. Now need to Heli-Coil?
> >
> > Robert Fisher was right.
> >
> > Two of the transmission mount bolts weren't properly tightened.
> >
> > They weren't really loose, which is why when I was checking over
> everything
> > (I stared at that transmission mount at least 6 different times) but I
> > guess
> > there was a little bit of wiggle room for the mount to pivot diagonally
> > across the two looser screws.  I think when I went to tighten them,  I
> > mistook resistance related to rust and the weight of the transmission as
> > the
> > bolt cap tightening down all the way.
> >
> > But now I have a problem.  One of the bolts, it seems, was made too
> tight.
> > Or maybe the threads were already trashed.
> >
> > So now my noise is gone but one of the four tranny mount bolt holes has
> > stripped out threads.  Is a heli-coil the answer here?  I've never had to
> > deal with this kind of situation before.  Any help would be greatly(!!!)
> > appreciated.  I guess I have to tap threads, and then insert the
> heli-coil?
> >
> > So, thanks to *everybody* that listened to my noise and gave me their
> > feedback.  It could have been any of the things people suggested, and the
> > encouragement to check over everything was exactly what I needed.
> >
> > Thanks again!!
> >
> >
>