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Guy-</div>
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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.</div>
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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.</div>
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Randy</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Triumphs <triumphs-bounces@autox.team.net> on behalf of Guy Huggins <guy.huggins@icloud.com><br>
<b>Sent:</b> Saturday, December 11, 2021 5:28 PM<br>
<b>To:</b> Triumph Mailing List <triumphs@autox.team.net><br>
<b>Subject:</b> [TR] 1965 TR4A - Looking to drill out a stud hole in block. Need recommendations on a drill guide/jig.</font>
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<div class="" style="word-wrap:break-word; line-break:after-white-space">Howdy All,
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<div class="">As part the head gasket replacement project, I need to address a wallowed-out and stripped cylinder head stud hole in the block.</div>
<div class="">(If you were standing on the manifold side of the engine, it would be the one furtherest to the front, on the manifold side.)</div>
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<div class="">A stud goes in straight up and down until the top of the threads are even with the block, but it wiggles like hell.</div>
<div class="">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.</div>
<div class="">This make it impossible to slide the head down over the canted stud.</div>
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<div class="">To fix this I intend to install a coiled insert. (drill just 1/32” oversized, tap, install insert).</div>
<div class="">I am hoping that someone from the list knows of a drilling jig/guide for the drilling phase.</div>
<div class="">I know better than to attempt drilling out cast iron without a steadying device of some sort.</div>
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<div class="">Any and all tips and advice are welcome.</div>
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<div class="">The hole is 1 5/16” deep, and the threads of the stud measure 3/4”.</div>
<div class="">It is basically threaded top to bottom.</div>
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<div class="">Thanks in advance.</div>
<div class="">I hate it when you have to fix the unknown thing to fix the known thing.</div>
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Kind Regards,<br class="">
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Guy D. Huggins<br class="">
<a href="mailto:guy.huggins@icloud.com" class="">guy.huggins@icloud.com</a><br class="">
817.454.6415</div>
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