<VV> Repair of head stud holes

[Charles McKinley]

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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