MTFCA Forum

Can anyone tell me what the MAXIMUM inside diameter of the phenolic material with it's 4 metal segments can be machined to before it is deemed too big? Also, what was the original inside diameter supposed to be when these were new from Ford? I'm referring specifically to the 1913 cast aluminum timer casing variety if that helps. Many thanks in advance!

Darren, I feel the limiting dimension is not the diameter of the roller path, but rather is the thickness of the metal segments on which the roller makes contact. If they phenolic is too warn, cleaning this up may mean the contacts may be machined too thin. I have cleaned mine up a couple of times, before I struck this limit.
Hope this helps.
Allan from down under.

The early timers seem to have the metal segments imbedded into the fiber material so one cannot physically see how much contact is remaining after machining unlike later Ford timers that the steel contact edges are visible bedded into the fiber.