[Fot] TR2 Cylinder Head Studs

[MadMarx]

If that would be good to set the bolt upstairs to the block to the factory
would have done it back in the days - shorter bolts are cheaper ;-)

I once did cure the problem this way.
I drilled out the hole to fit a M18 sleeve. The inside was prepared for the
stud to fit down in the block.
The outside was fitted with the M18 thread over the whole length.
The sleeve was run in with epoxy and the little protrusion was removed very
gently with a fine file.

Example for a short sleeve:
https://lh6.googleusercontent.com/-Mc_c4IxD4NY/UNRWKwzstaI/AAAAAAAABk4/cEYb7
NrE2as/s985/DSCN1569.JPG


-----Urspr|ngliche Nachricht-----
Von: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] Im
Auftrag von M&M Hado
Gesendet: Freitag, 21. Dezember 2012 04:35
An: 'Bob Kramer'
Cc: fot at autox.team.net
Betreff: Re: [Fot] TR2 Cylinder Head Studs

Thanks, Bob.  I have decided to put the HeliCoil at the top of the hole and
use a short stud.  The existing hole is already the exact size for the
HeliCoil tap so the installation was easy.  I torqued it up and looks to be
OK, so I'm hoping for the best with no resulting block stresses that will
cause problems.  The owner does not stress the car.  Thanks for your
suggestions.

Mike

-----Original Message-----
From: Bob Kramer [mailto:rkramer3 at austin.rr.com]
Sent: Thursday, December 20, 2012 8:21 PM
To: mhado at att.net
Cc: <fot at autox.team.net>
Subject: Re: [Fot] TR2 Cylinder Head Studs

I don't know about the Helicoil option. You might be able to convert the
"hole" to a short stud with a Helicoil but it may stress the block
improperly. FWIW I took apart one block that had a long stud drilled and
tapped at the bottom through the block and locked in place that way. It was
also drilled for a set screw from the side. It wasn't a running engine but
it looked like it had worked.

Sent from my iPhone

On Dec 18, 2012, at 6:48 PM, "M&M Hado" <mhado at att.net> wrote:

> I was just finishing up a TR2 engine rebuild and one of the 9.5" studs
> stripped the threads in the block at the bottom of the 4" hole when I
> got to about 70 ft-lb.  Has anyone successfully put a HeliCoil at the
> bottom of this hole?
>
> The original size of the hole in the block is about 17/32" (just
> enough to accommodate the 1/2" stud, of course) and this happens to be
> the tap drill size for the 1/2-13 HeliCoil.  The OD of the HeliCoil
> itself
is about .615"
> so that means I would have to drill out the hole in the block to
> something larger than this - say 5/8" and save about an inch at the
> bottom for tapping for the HeliCoil.  I'm wondering if there is enough
> meat in the block to drill out the hole to 5/8".
>
> Having gone this far, I really would like to save this block so any
> ideas/hints/experience would be appreciated.
>
> Thanks,
>
> Mike Hado
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