[TR] 1965 TR4A - Looking to drill out a stud hole in block. Need recommendations on a drill guide/jig.

[Sujit Roy]

Canted studs On Stag too. Regarding coiled inserts.  Time Serts are good.
Not cheap though.
Sujit

On Mon, Dec 13, 2021, 6:42 AM David P <frogeye at porterscustom.com> wrote:

> ... my recollection is waning, but did not the TR7 block have purposely
> canted head studs that had to be removed/inserted individually? Anyone?  dp
> On 12/13/2021 7:08 AM, Randy and Valerie DeRuiter wrote:
>
> Guy-
>
> I don't want to sound too doom and gloomy, but have you ruled out a
> cracked block at that location?  That is a common spot for one, usually
> from someone in the past who pulled the engine by the studs. At least I had
> an engine like that.  If you haven't done so, take a very good look at the
> inside edge of the threaded hole.  If you see a crack, that helicoil trick
> likely won't work.
>
> If you are convinced it is not cracked, possibly another solution would be
> to take advantage of the deeper hole that you've measured and get a shop to
> extend the threads of a longer head bolt.  One of the inside longer ones
> might work - then shorten the other end to fit.  The puzzling part is why
> does the stud cant to the rear - that doesn't sound good.
>
> Randy
>
> ------------------------------
> *From:* Triumphs <triumphs-bounces at autox.team.net>
> <triumphs-bounces at autox.team.net> on behalf of Guy Huggins
> <guy.huggins at icloud.com> <guy.huggins at icloud.com>
> *Sent:* Saturday, December 11, 2021 5:28 PM
> *To:* Triumph Mailing List <triumphs at autox.team.net>
> <triumphs at autox.team.net>
> *Subject:* [TR] 1965 TR4A - Looking to drill out a stud hole in block.
> Need recommendations on a drill guide/jig.
>
> Howdy All,
>
> As part the head gasket replacement project, I need to address a
> wallowed-out and stripped cylinder head stud hole in the block.
> (If you were standing on the manifold side of the engine, it would be the
> one furtherest to the front, on the manifold side.)
>
> A stud goes in straight up and down until the top of the threads are even
> with the block, but it wiggles like hell.
> As you tighten the stud down further, the wiggle starts to go away, but
> the whole thing starts to cant back toward the rear of the block.
> This make it impossible to slide the head down over the canted stud.
>
> To fix this I intend to install a coiled insert.  (drill just 1/32”
> oversized, tap, install insert).
> I am hoping that someone from the list knows of a drilling jig/guide for
> the drilling phase.
> I know better than to attempt drilling out cast iron without a steadying
> device of some sort.
>
> Any and all tips and advice are welcome.
>
> The hole is 1 5/16” deep, and the threads of the stud measure 3/4”.
> It is basically threaded top to bottom.
>
> Thanks in advance.
> I hate it when you have to fix the unknown thing to fix the known thing.
>
>
> Kind Regards,
>
> Guy D. Huggins
> guy.huggins at icloud.com
> 817.454.6415
>
>
>
>
>
>
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