Big2Bird

Just talking out loud, but I "assume" bad tach cables and heads are the culprit here.
I have taken apart old ones with the nylon button shows little wear.
(Yes, I know this one is earlier).

DarrenX33

Are you speaking of my distributor? If so can you elaborate?

Big2Bird

Not really. The issues with the earlier units like yours is why GM added the button later.
But still, there would have to be a fair load on that gear to cause the thrust wear.

lars

Jeff & all -
Most distributors I see with wear like that have been installed in the stock, factory "clocking" orientation, which puts the tach cable in a heckuva bind. The wear problem, after proper repair, is solved by installing the distributor in the "service bulletin" orientation to straighten out the tach drive cable. Anyone needing this info can e-mail me for my "Distributor Installation" tech paper.

Lars

Big2Bird

That makes sense. Otherwise, there should not be that large a load on the gears.

Of course the steel gear against the soft cast iron is a router bit at best.