<VV> Repair of head stud holes

[Dennis Pleau]

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.