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

[Dave Connitt]

Hello Guy,
That is a tough one. Have you considered talking this over with  the machinist that did your cylinder head as he may have come across this type of issue before. I agree with you that locating and holding the X, Y and Z positions of the repair is critical. 
Best of luck to you.
Dave Connitt 

Sent from my iPhone

> On Dec 11, 2021, at 6:35 PM, Guy Huggins <guy.huggins at icloud.com> wrote:
> 
> 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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