[Healeys] Exhaust header stud fix ?

[Bob Spidell]

I always use it on thread inserts, but heat is the one thing that 
releases it. Like Bill said, it's pretty hot there, but I see no harm on 
giving it a go.

On 2/28/2021 2:44 AM, Alan Seigrist wrote:
> Bill -
>
> One question - the hole goes from one end to the other on the flange 
> of the exhaust manifold, so do I set the coil with some high strength 
> threadlocker?
>
> Best,
>
> Alan
>
> On Sun, Feb 28, 2021 at 1:21 PM WILLIAM B LAWRENCE via Healeys 
> <healeys at autox.team.net <mailto:healeys at autox.team.net>> wrote:
>
>     I doubt there is anything non-metallic that will stand up to the
>     heat that close to the exhaust valves. Sounds like a job for a
>     helicoil.
>
>     Bill Lawrence
>     BN1 #554
>     ------------------------------------------------------------------------
>     *From:* Healeys <healeys-bounces at autox.team.net
>     <mailto:healeys-bounces at autox.team.net>> on behalf of Bob Spidell
>     via Healeys <healeys at autox.team.net <mailto:healeys at autox.team.net>>
>     *Sent:* Sunday, February 28, 2021 5:06 AM
>     *To:* healeys at autox.team.net <mailto:healeys at autox.team.net>
>     <healeys at autox.team.net <mailto:healeys at autox.team.net>>
>     *Subject:* Re: [Healeys] Exhaust header stud fix ?
>     I used this stuff once to bolster the threads in a bellhousing slave
>     cylinder mount:
>
>     https://www.amazon.com/Loctite-442-28654-4-80ml-Thread-Stripped/dp/B000WSEUII/ref=asc_df_B000WSEUII/?tag=hyprod-20&linkCode=df0&hvadid=312106049007&hvpos=&hvnetw=g&hvrand=6889728303295400308&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1014019&hvtargid=pla-440732566291&psc=1&tag=&ref=&adgrpid=62149806956&hvpone=&hvptwo=&hvadid=312106049007&hvpos=&hvnetw=g&hvrand=6889728303295400308&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1014019&hvtargid=pla-440732566291
>
>     It held up for quite a few years, until I got a chance to put inserts
>     in; but, 300degF may not be enough for exhaust proximity. It's an
>     epoxy,
>     like JB Weld, but it uses (your) bolt to form threads, and a 'release
>     agent' to keep the bolt/stud from being glued in. I can't say for
>     sure,
>     but my gut feeling is an epoxy would gum up a tap.
>
>     Bob
>
>     On 2/27/2021 8:25 PM, Alan Seigrist via Healeys wrote:
>     > All -
>     >
>     > One of the three holes at the bottom of my exhaust header is
>     loose and
>     > the stud doesn't seat properly (but it does screw in).
>     >
>     > I was thinking of putting some "thermosteel" or JB "extreme
>     heat" in
>     > there then tapping it out.
>     >
>     > The threads are still there and it just needs a bit of fill to
>     tighten
>     > it up.
>     >
>     > Has anyone ever done a similar repair?  Will it last?
>     >
>     > Alan
>     >
>

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