Curt -
I think what might be special is the length of the screws, to prevent
fouling with the heat shield? They may be a very specific length, one offs
for this specific application.
Best,
Alan
On Mon, Jul 22, 2013 at 11:53 AM, Curtis Arndt <cnaarndt@gmail.com> wrote:
> Michael,
>
> I have plenty of originals of these and as soon as I have a spare moment I
> will send you detailed photos and measurements. The ones you sent a
> picture of are close, but my originals are NOT bright zinc plated.
>
> As to why they are special, the only reason they should be listed as a part
> number where if they where a "Whitworth" thread form, which they are
> obviously not since they are sheet metal screws. Very curious?
>
> Cheers,
>
> Curt
>
>
> On Sun, Jul 21, 2013 at 5:54 AM, Michael Salter <michaelsalter@gmail.com
> >wrote:
>
> > Here is one for the purists....
> > The overdrive relays, there are 2, on a BN1 are secured to the heater
> duct
> > by
> > 4 self tapping screws part # 4K5917.
> > According to the parts book that is the only place where screws with that
> > part
> > number are used on any model as far as I can tell.
> > Does anyone know what is so special about these 4 screws, or for that
> > matter
> > know how they differ from others used generously throughout Healeys.
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