[DeTomaso] Stripped Heli coils in Fontana Block
jderyke at aol.com
jderyke at aol.com
Sat Jan 30 15:14:06 EST 2021
I've used several kinds of inserts successfully. The key to using them for head bolts/studs is to make sure the insert has enough threads to hold the torque when hot. With Helicoils the main reason they fail seems to be that the insert chosen is just too short for the job. In light alloys, I've doubled up on inserts while timing the threads with a custom mandrel, and in two cases I had to fabricate my own inserts as I couldn't find a commercial one that I considered long & strong enough. Unless you own a lathe and other such tools, it may be time to call a local pro shop. Joe Fontana is still around in So-Cal, you know. Good luck- J Deryke
-----Original Message-----
From: B Hower via DeTomaso <detomaso at server.detomasolist.com>
To: Will Kooiman <will.kooiman at gmail.com>; Steven Edwards <gsedwards at cox.net>; Julian Kift <julian_kift at hotmail.com>
Cc: detomaso at server.detomasolist.com <detomaso at server.detomasolist.com>
Sent: Sat, Jan 30, 2021 11:57 am
Subject: Re: [DeTomaso] Stripped Heli coils in Fontana Block
I have used Keensert:
[1]keensert kit - Recherche Google
[80x80_google.png]
keensert kit - Recherche Google
Bud #3400 ( Drive it like there is no tomorrow -- for there may not be
! )
On Saturday, January 30, 2021, 1:05:11 PM CST, Julian Kift
<julian_kift at hotmail.com> wrote:
I have had good success (non-head application) with Timesert another
brand of solid insert, the kits come with everything required to
drill
and tap the oversize hole for the solid insert to thread into. You do
need to have enough material to drill the oversize hole and they only
thread
[1][2]http://www.timesert.com/
Julian
__________________________________________________________________
From: DeTomaso <[3]detomaso-bounces at server.detomasolist.com> on
behalf of
Will Kooiman <[4]will.kooiman at gmail.com>
Sent: Saturday, January 30, 2021 10:52 AM
To: Steven Edwards <[5]gsedwards at cox.net>
Cc: [6]detomaso at server.detomasolist.com
<[7]detomaso at server.detomasolist.com>
Subject: Re: [DeTomaso] Stripped Heli coils in Fontana Block
I had a similar issue in some aluminum heads several years ago. I
talked to an engine builder that was supplying parts to me. He
turned
me on to Rockmount solid inserts. They work like helicoils, but they
are solid - not a spring.
This was 3/8ths though, and not as critical as head studs. You drill
slightly larger than what's required by helicoils. The insert cuts
the
threads. There are different brands of solid inserts, and I'm sure
you
can get them in several sizes - maybe even custom.
My point is it is fixable, but talk to the pros. If possible, have
them do the repairs.
Sent from my iPhone
> On Jan 30, 2021, at 9:53 AM, Steven Edwards <[8]gsedwards at cox.net>
wrote:
>
> Need ideas as to how to repair, if I can, stripped Helicoils in
an
> aluminum block.
>
> I have two 1/2' main studs that did not torque in a Fontana block.
>
> I pulled the studs to find that the Helicoils were being pulled
up,
and
> stripping the aluminum threads.
>
> Can I repair these Helicoil threads? Any ideas?
>
> I Googled it several times, and all that comes up is how to
install
the
> Helicoils in aluminum. Not how to repair the Helicoil threads.
>
> Thanks
>
>
> Steven Edwards
> _______________________________________________
>
>
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References
1. [13]http://www.timesert.com/
2. [14]http://server.detomasolist.com/mailman/listinfo/detomaso
3. [15]http://server.detomasolist.com/mailman/listinfo/detomaso
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-------------- next part --------------
I've used several kinds of inserts successfully. The key to using them
for head bolts/studs is to make sure the insert has enough threads to
hold the torque when hot. With Helicoils the main reason they fail
seems to be that the insert chosen is just too short for the job. In
light alloys, I've doubled up on inserts while timing the threads with
a custom mandrel, and in two cases I had to fabricate my own inserts as
I couldn't find a commercial one that I considered long & strong
enough. Unless you own a lathe and other such tools, it may be time to
call a local pro shop. Joe Fontana is still around in So-Cal, you know.
Good luck- J Deryke
-----Original Message-----
From: B Hower via DeTomaso <detomaso at server.detomasolist.com>
To: Will Kooiman <will.kooiman at gmail.com>; Steven Edwards
<gsedwards at cox.net>; Julian Kift <julian_kift at hotmail.com>
Cc: detomaso at server.detomasolist.com <detomaso at server.detomasolist.com>
Sent: Sat, Jan 30, 2021 11:57 am
Subject: Re: [DeTomaso] Stripped Heli coils in Fontana Block
I have used Keensert:
[1]keensert kit - Recherche Google
[80x80_google.png]
keensert kit - Recherche Google
Bud #3400 ( Drive it like there is no tomorrow -- for there may not
be
! )
On Saturday, January 30, 2021, 1:05:11 PM CST, Julian Kift
<[1]julian_kift at hotmail.com> wrote:
I have had good success (non-head application) with Timesert
another
brand of solid insert, the kits come with everything required to
drill
and tap the oversize hole for the solid insert to thread into. You
do
need to have enough material to drill the oversize hole and they
only
thread
[1][2][2]http://www.timesert.com/
Julian
__________________________________________________________________
From: DeTomaso <[3][3]detomaso-bounces at server.detomasolist.com> on
behalf of
Will Kooiman <[4][4]will.kooiman at gmail.com>
Sent: Saturday, January 30, 2021 10:52 AM
To: Steven Edwards <[5][5]gsedwards at cox.net>
Cc: [6][6]detomaso at server.detomasolist.com
<[7][7]detomaso at server.detomasolist.com>
Subject: Re: [DeTomaso] Stripped Heli coils in Fontana Block
I had a similar issue in some aluminum heads several years ago. I
talked to an engine builder that was supplying parts to me. He
turned
me on to Rockmount solid inserts. They work like helicoils, but
they
are solid - not a spring.
This was 3/8ths though, and not as critical as head studs. You
drill
slightly larger than what's required by helicoils. The insert cuts
the
threads. There are different brands of solid inserts, and I'm sure
you
can get them in several sizes - maybe even custom.
My point is it is fixable, but talk to the pros. If possible, have
them do the repairs.
Sent from my iPhone
> On Jan 30, 2021, at 9:53 AM, Steven Edwards
<[8][8]gsedwards at cox.net>
wrote:
>
> Need ideas as to how to repair, if I can, stripped Helicoils
in
an
> aluminum block.
>
> I have two 1/2' main studs that did not torque in a Fontana
block.
>
> I pulled the studs to find that the Helicoils were being pulled
up,
and
> stripping the aluminum threads.
>
> Can I repair these Helicoil threads? Any ideas?
>
> I Googled it several times, and all that comes up is how to
install
the
> Helicoils in aluminum. Not how to repair the Helicoil threads.
>
> Thanks
>
>
> Steven Edwards
> _______________________________________________
>
>
> Detomaso Email List is not managed by POCA
> Posted emails must not exceed 1.5 Megabytes
> DeTomaso mailing list
> [9][9]DeTomaso at server.detomasolist.com
>
[2][10][10]http://server.detomasolist.com/mailman/listinfo/detomaso
>
> To manage your subscription (change email address, unsubscribe,
etc.)
use the links above.
>
> Members who post to this list grant license to the list to
forward
any message posted here to all past, current, or future members of
the
list. They also grant the list owner permission to maintain an
archive
or approve the archiving of list messages.
_______________________________________________
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References
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[18]https://www.google.com/search?client=firefox-b-1-d&q=keensert+kit
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