Packard Forum Index » Pre-War (1899-1942)

In going over the flywheel out of my '37 120 I noticed a blind hole 0.365" diameter x 0.530" deep bored into the 'engine' side of the face in the area of the timing marks. Does anyone know what this was for? Was it used as an index to align the stamping of the timing marks? Just curious as to why it was carefully machined into the part.
Thanks,
Bob J.

Attach file:

---

  Flywheel Hole.jpg (180.87 KB)

If it's a neatly drilled hole partway through the flywheel, it's probably for balance. Many cast rotating parts that were factory balanced will have from one to a number of such holes where metal was removed to bring the part into dynamic balance.

Ah, that makes sense! Thanks.
Bob J.

I remember reading, I think in one of the first Packard Pointers, that c. 1910 it was one specific guy's job at the factory to wield a drill to balance the flywheels on a stand. Something which surely took a lot of practice to get good at.