<VV> Repair of head stud holes

[Mark Durham]

Dennis is correct, I always used the longer Heli-Coils in the aviation
platform, it didn't cross my mind because we never used the short version in
anything that was critical to safe flight.

Also, Churcks idea to use the oversize OTTO studs will do the same thing.
Like that oversize stud, the Heli-coil spreads the pull over a larger
surface area. The larger you go the stronger it gets.
Mark Durham

On Sun, Mar 21, 2010 at 5:34 PM, Charles McKinley <cmckinley313 at cox.net>wrote:

> Another choice might be the OTTO heavy-duty studs that are bigger
> (7/16") at the block end and taper to 3/8" for the standard head nuts.
> It requires drilling and tapping an oversize hole at the block, but
> you're probably facing a similar prospect in any case.
>
> Chuck McKinley
>
> On Mar 21, 2010, at 8:11 PM, Dennis Pleau wrote:
>
> > I've heard you need to use the long Heli-coils or two coils for head
> > studs.
> > I've never done it, but have heard over and over one standard coils
> > has a
> > good chance of pulling.
> >
> > dp
> >
> > -----Original Message-----
> > From: virtualvairs-bounces at corvair.org
> > [mailto:virtualvairs-bounces at corvair.org] On Behalf Of Mark Durham
> > Sent: Sunday, March 21, 2010 4:45 PM
> > To: Tom Gould
> > Cc: virtualvairs at corvair.org
> > Subject: Re: <VV> Repair of head stud holes
> >
> > Tom, its really up to you. I will say, though, that I have installed
> > many
> > Helicoils in Aluminum Aircraft engine cases with lasting success.
> > Its all we
> > used in the aircraft industry. Mark Durham
> >
> > On Sun, Mar 21, 2010 at 12:03 PM, Tom Gould <tgould at hargray.com>
> > wrote:
> >
> >> While reinstalling the heads one of the .006 studs  backed out.
> >> Clarks
> >> sells Heli-coil and Time-Sert inserts. I've used heli-coil type
> >> inserts on
> >> other bolt holes but this is the first time I've had to repair a
> >> head stud
> >> hole. It's on #2, next to oil cooler,  so I may be able to do it w/o
> > pulling
> >> the engine.  Any input (pros,cons, suggestions) will be greatly
> > appreciated.
> >
> >
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