[Healeys] Distributor Swap

[Alan Seigrist]

Simon -

You'll need to do a roadside timing.  With contacts, it's easy because you
can twist the dizzy until you see the contacts open at TDC, then start the
car and advance the dizzy a bit until you get smooth running.  Usually
that's pretty accurate to within a couple degrees.

Since you have a pertronix, I would recommend fitting the dizzy first and
using a timing gun figure out where it's supposed to be, then make a mark
at the bottom of the dizzy with a permanent marker so that you can just pop
it in the right spot if you ever get in trouble.

Best,

Alan

On Mon, Mar 27, 2023 at 4:04 AM Simon Lachlan via Healeys <
healeys at autox.team.net> wrote:

> I should probably be able to work this out for myself, but – just to be
> sure – I’m asking the experts.
>
> Talking about a Lucas DM6a in a MkII BT7. And a 123 alternative.
>
>
>
> So, I have a 123 installed in the car and a Lucas DM6A, complete with
> Pertronix, in the boot. (Trunk!) Yes, both distributors have the correct
> “Drive dog(?)” on the bottom. (Part 25 in the attached pic).
>
> Thus, it is mechanically possible to remove the 123 and drop in the Lucas
> in its place.
>
>
>
> My question is this……if I manage to accomplish this without messing up the
> timing ie rotating the distributors in the clamp, will everything line up
> and the engine fire up?? I hope that the Drive dog will/can only slot into
> one position and that will be the one and only correct position. If you see
> what I mean?
>
>
>
> I hope to be able to carry the Lucas as a spare “get you home” and,
> likewise, hope that it’s a  straight swap without having to frig around
> with the timing.
>
>
>
> Am I correct? It’ll be a straightforward swap or will it turn into a
> complicated roadside tune-up??
>
>
>
> Thanks,
>
> Simon
>
>
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