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Old 03-24-2021, 07:54 AM   #21
Jack Shaft
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Default Re: Head stud repair with insert...Q

Torque is used to put the stud in tension. This allows the assembly to be made without a locking device and provides a stable basis for heat cycling. In my experience .6 is an adequate depth of threads for a 7/16th NC stud.

Use a magnetic base drill (rent one) to insure the pilot hole for the insert is square to the deck. Drilling by hand can result in an offset pilot hole, placing two forces on the stud when tensioned. I prefer the integrity of a timesert and use anaerobic sealant on installation (loctite). Anaerobic means in the absence of air it cures, given the weakness and ductility of ford grey iron castings the sealant actually helps support the assembly by filling any void as well as locking it.
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Old 03-25-2021, 11:40 PM   #22
hardtimes
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Default Re: Head stud repair with insert...Q

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Originally Posted by Jack Shaft View Post
Torque is used to put the stud in tension. This allows the assembly to be made without a locking device and provides a stable basis for heat cycling. In my experience .6 is an adequate depth of threads for a 7/16th NC stud.

Use a magnetic base drill (rent one) to insure the pilot hole for the insert is square to the deck. Drilling by hand can result in an offset pilot hole, placing two forces on the stud when tensioned. I prefer the integrity of a timesert and use anaerobic sealant on installation (loctite). Anaerobic means in the absence of air it cures, given the weakness and ductility of ford grey iron castings the sealant actually helps support the assembly by filling any void as well as locking it.
Hey Jack,
Thanks for your input !
Very helpful. I’ll check on timesert for comparative detail with others I’ve studied.
Don’t know of magnetic base drill. Sounds good idea.
I am terrible at drilling straight. With shakes and arithritis hands, that aint happening. That wont keep me from trying.

BTW - Im familiar with ‘anaerobic’ .. sealant. But why not just use 2 part epoxy of some sort ? Especially , if hru to water ?

Last edited by hardtimes; 03-26-2021 at 12:03 AM. Reason: Xxxxx
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Old 03-26-2021, 12:14 AM   #23
Richard Knight
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Default Re: Head stud repair with insert...Q

Hardtimes, To get your holes straight just use a cylinder head. Mark the holes you want to drill out for inserts on the head with chalk, I used heli-coils, and use the proper drill for the insert. Use three or four studs to hold the head on and drill away. works every time. Rick.
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Old 03-26-2021, 10:29 AM   #24
Ruth
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Default Re: Head stud repair with insert...Q

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Hey Ruth,
Someone else mentioned oversize studs and Brattons. I’ll check that. Brattons is the one catalogue... I don’t have.

That being said, my stud hole problem is more than a few thou oversize stud will fix.
Thanks.
The oversize stud is more than "a few thou oversize". The threads that go into the block go from 7/16"-14 to 1/2"-13 for the oversize stud.

https://www.brattons.com/over-size-t...long-stud.html
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Last edited by Ruth; 03-26-2021 at 10:39 AM.
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