I'll almost garauntee that it isn't and NPT fitting. It is most likely a
BSP fitting.
aaron
On Tue, 31 Mar 1998, Peter Zaborski wrote:
>
> > -----Original Message-----
> > From: Peter J Barrance [SMTP:pjb@eagle.gsh.jhu.edu]
> > Sent: Tuesday, March 31, 1998 10:26 AM
> > To: triumphs@autox.team.net
> > Subject: SU H6's on TR6 (need vac adv. fitting).
> >
> > But the real question I'm coming to is this... anyone know the best
> > place to get a vacuum advance fitting for this carb? I.e. - there's a
> > port on the bottom of the carb body w/ a tapped hole to receive a
> > threaded fitting, which I would install and attach the vac. adv.
> > distributor pipe to.
> >
> I don't know about TR3s but on my ZS carbs (late TR6) the fitting you
> speak of is a 1/8" NPT thread. The fitting you would require for this
> (small brass threaded part with a plain hose fitting on the other end)
> is available at any Home Depot (at least here). If not, try an auto
> parts store (Pep Boys?).
>
> If you don't have a thread gauge, then try threading a grease nipple
> with the 1/8NPT thread (very common size) and see how it fits.
>
> One thing to keep in mind about NPT threads (National Pipe Thread) is
> that the part on which the thread is is tapered (ie. smaller diameter at
> the start than at the end - as viewed in the direction of insertion).
> This allows the pipe thread to make a seal. The point of this warning
> being that if the thread does fit your carb, it will eventually get
> tight to turn by hand as the tapered diameters of the bore and plug
> approach equal dimensions. This is normal for pipe threaded objects.
>
> Hopefully SUs are similar to ZSs in this regard. If not and I am lying,
> I am sure someone will correct me.
>
> Good luck,
>
> Peter Zaborski
> 76 TR6 (CF58310 UO)
> Calgary AB Canada
>
>
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