Bruce,
There are threaded inserts that are a lot bigger in diameter than the
heli-coils. I can't remember what they're called at the moment. They have 4
knife-like locking pins that you drive into place after installing them.
That keeps them from rotating in or out. Perhaps someone out there knows
what they're called and where to get them easily.
Allen Brenden
Everett, WA USA
Uncle Al's TR7 Homepage + Wood Trim
http://www.premier1.net/~albrendn/index.htm
----- Original Message -----
From: <Eganb@aol.com>
To: <Triumphs@autox.team.net>; <british-cars@autox.team.net>;
<tr8@mercury.lcs.mit.edu>
Sent: Sunday, November 05, 2000 1:59 PM
Subject: TR7 BFH#24-b
> Well, using blue (medium) loctite and letting it dry overnight didn't
help.
> heliocoil still just works it's way out of the hole.
>
> thanks to everyone for lots of ideas on fixing this. again these holes
have
> been heliocoil-ed before, so every time i drill and tap them the helocoils
> just get looser.
>
> So, below I've listed my possible options at this point, and I'll call my
> machine shop tomorrow for their advice. But wait! You say you're
dismayed
> that your vote on Tuesday is just a vote for the lesser of two evils?
Well
> cheer up! You're vote below for one option from Plan A and one option
from
> Plan B will definitely make a difference to this Triumph owner in
Carolina!
>
> Vote today, and vote often!
>
> Plan A: The top holes are open on the back, so three possibilities:
>
> A1. I probably could put studs on the top holes with nuts on the
backside.
> I've still got plenty of aluminum head material around the holes, but i'm
> slightly concered that the 3/8 stud will wobble around in the hole which
is
> now large enough to take a 7/16 bolt (and no, that bolt won't hold either)
> so, maybe insert a bushing in the hole, and use flat washers to distribute
> the pressure?
>
> A2: If I try the heliocoil again, is there a millimeter bolt size that is
> slighter larger than 3/8", but not as large as 7/6" which is the next
English
> size up and won't fit? Maybe a slightly larger millimeter bolt would keep
> the heliocoil in place.
>
> A3. Try using red loctite, which is the permanent stuff, although heat
may
> be a problem. I also thought about J&B weld, so I'll probably check out
the
> Internet tonight for other options for holding in the heliocoils.
>
> xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> Plan B: The lower holes are blind, so studs with nuts on the end aren't
an
> option.
>
> B1. I did heliocoil one of those holes, and it seems to be holding, so
try
> heliocoil on the other two with red loctite? Maybe heliocoil works better
on
> a blind hole for some reason?
>
> B2. Try the other products similar to heliocoil that are solid inserts?
>
> B3. Try the millimeter bolt trick mentioned above.
>
> B4. Tap out to whatever is after 7/16.
>
>
> Bruce
> 1980 Inca Yellow TR7 5-speed convertible
> Chapel Hill, NC
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