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

[David P]

... 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> on behalf of Guy 
> Huggins <guy.huggins at icloud.com>
> *Sent:* Saturday, December 11, 2021 5:28 PM
> *To:* Triumph Mailing List <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
>
>
>
>
>
>
> **triumphs at autox.team.net  **
>
> Donate:http://www.team.net/donate.html
> Archive:http://www.team.net/pipermail/triumphs   http://www.team.net/archive
>
> Unsubscribe/Manage:http://autox.team.net/mailman/options/triumphs/frogeye@porterscustom.com

-- 
Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My World go here:WWW.PORTERBIKES.COM/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/triumphs/attachments/20211213/467f725e/attachment.htm>