[TR] manual gearbox alignment bolts TR6 /Stag (Sujit Roy)

[Sujit Roy]

HI Randall and Frank,
It for  the Stag  I have 2 aircraft bolts with 3/8 diameter plain shank
that I can use.These are a very tight fit. LD Parts has a specialty
machined bolt that fits  one of the lower holes. Its 24 pounds. Not cheap.

I think I will stick with the two ones I have.

Frank. Rob Sport in UK makes the longer snout. They take your short snout
in exchange. I have  the longer snout. I'm working on a second Stag. It
will be manual with J type OD.

Sujit

On Fri, Feb 15, 2019, 2:06 PM Frank Magnusson <fmags at cox.net wrote:

> Hi Sujit,
>
> Very common problem on the Stag, which does not have these dowels (and
> should).  On the TR6 (and GT6) IIRC, there are just several dowels on the
> top and not the bottom.  I never had an issue with these dowels on my TR6
> or
> GT6 and never needed to replace them, having had several gearboxes in and
> out.  So, I'm assuming you're talking for the Stag.
>
> For the Stag, I never had any issues with my clutch until I decided to
> change it, and then had all kinds of the classic Stag issues of sticking
> clutch and juddering.  Compounded by the NOS pressure plate I installed was
> defective....
>
> For the dowels, I wasn't able to find any of these dowels at the time.  I
> assume I tried Rimmers and Paddocks at the time, but it's probably been 10
> years.  The bolt holes on the bell housing and block on mine were oval
> shaped from wear, so I took a reamer and got them round again and up to a
> standard size of the reamer, then went to an aerospace machine shop and had
> them make me some dowel pins of the right size.  I believe he started with
> dowel pins that they use for jigs and other hard tooling.  That along with
> a
> good heavy duty pressure plate and clutch from Tony Hart in the UK and the
> longer "snout" on the gearbox fixed all of my issues.
>
> There is a good article on the Buckeye Triumphs site on the clutch judder
> issue and snout; apparently it's a TR6 problem as well, although I never
> had
> it on mine.  Worse on the Stag due to the heavier clutch I think.
>
> My Mk I Stag had the shorter snout.  I believe the factory changed to a
> longer snout in around '76.  I got a good used longer snout from Martin
> Dimmock in the UK.  Not sure if the usual suppliers sell these now or not,
> but upgrading to the longer snout would be a good idea if you're in there.
> That's what the factory did.
>
> If your top bolt holes on your bellhousing and block are oval like mine
> were, standard dowels may not work.  Worth a try if they're not too bad.  I
> chose to have some custom made; not sure if std dowel pins would have
> worked
> or not, as I couldn't locate any.
>
> What issues are you having with yours?
>
>
> Frank
>
> <Im aware the TR6 gearbox uses two special machined bolts to align the box
> to engine plate.
> They are positioned about 11pm and 2pm on the bell housing.
>
> Someone on that  forum used one at the bottom as well (slightly smaller
> diameter bolt.)
>
> Has anyone else tried this and if so, where did you get the bolt?
> The Stag and TR6 bell housing are similar.
>
> Does anyone know if the Dolomite Sprint used the same bell housing as the
> TR6?>
>
>
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