[TR] Need help sourcing special gearbox to engine alignment bolts

[Sujit Roy]

Here's a link to a special bolt which came off an Mk1 '71 BW35 Stag.
Randall, the manual gearbox you sold me had a dowel in it.

https://photos.app.goo.gl/iYffI74GF9UcD9Jy2



This place seems to carry   132872 but I'm sure as pointed out it is
shorter as the Stag had the short adapter plate.


https://www.revingtontr.com/product/132872/name/dowel-bolt

Sujit

On Fri, Mar 30, 2018 at 6:39 PM, Randall <TR3driver at ca.rr.com> wrote:

> > The Stag has 2 special machined alignment bell housing bolts. I'm
> assuming
> > the TR6 and other Triumph used similar.  Are these available anywhere?
>
> I could not find any that I trusted when I was doing my Stag.  Rimmers had
> them listed as being superceded to ordinary bolts.  And if memory serves, I
> determined that the TR6 ones are different (as well as being NLA at that
> time).  They have a different part number, and IIRC are slightly shorter
> because they clamp to the TR6 engine rear plate, which is steel and thinner
> than the Stag's aluminum flywheel housing.
>
> Many TR6 builders have used ordinary dowels instead (which is also what the
> earlier TRs used in those same holes).  But I know that flange is a bit of
> a
> weak area (and in fact was broken on my Stag), and I felt that Triumph
> probably had a valid reason for using "dowel bolts" instead of ordinary
> dowels.
>
> So what I did was to buy some precision drill rod (in annealed condition),
> cut to length, and thread both ends for nuts.  I didn't bother hardening
> it,
> since my feeling was that it was strong enough in the annealed state.
> https://www.mcmaster.com/?m=true#8893k239/=1c79urh
>
> Probably best to use a new die to cut the threads.  My old die had a really
> hard time of it.
>
> BTW, there is no shoulder involved.  The special bolts just have a
> precision
> ground .3750" shank with an extra long grip length (so it goes through both
> flanges).
>
> -- Randall
> 56 TR3 TS13571L once and future daily driver
> 71 Stag LE1473 - awaiting engine rebuild
> 71-2-3 Stag - awaiting gearbox rebuild
>
>


-- 
Sujit Roy
Cupertino, California

https://triumphstagblog.wordpress.com/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/triumphs/attachments/20180402/036ddfc5/attachment.html>