It took approximately forever, but today I finally got all the pins out so I could remove the cams and levers. I checked the cam shafts for wear and found this.
The shaft here is .497"
The "worn" part is .493".
This shaft is .498".
Looks like the worn part is .4975"
Unless somebody points out a reason not to, I'll just install the new bushings, ream to .500", and reassemble. The cams appear to be very little worn, if at all. One of them has Ford stamped in the face.
The only thing that gives me pause here is the surface being rough.
Looks like someone clamped that cam in a pair of vise-grips, I would take a very fine file to it and knock off the high spots.
Speaking for myself, I wouldn't fret about that small amount of wear on the shaft. You're only working these parts to apply the parking brake after you come to a stop, correct? If it were heavily used in service brake duty, that would be another story.
I wouldn't hesitate to use them. It's not like they spin continuously in their bushings. Grease them when you install them and they'll last a long time.
I've also seen the "Ford" script stamped onto the end - not seen one stamped on the wear surface.
It turns out this was unnecessary. I went back and looked at my receipts, and found that when I bought new bushings last summer I also bought new cams. Now the challenge that faces me is finding where I put them.
Steve, If you want to find them, install the old ones and after everything is together and running, you will find the new ones you bought!
You already know this, but be extra sure to get the cams on the correct side of the car, they come in rights and lefts.
Steve, the same thing is happening to me. On the positive side you may locate things that you had forgotten you owned.Good luck.
Steve T. I have several N.O.S., and all are stamped there.
If you sand blast those, and measure, they would be even smaller.
If you try to fit something like that with that much wear, the out come will not be good.
Most of the wear is close to the pin holes on the shaft, and you are going to have a lot of lost motion with all that clearance.
They should be fit so there is no binding, but no movement side ways. That would be somewhere between .000-50, and .001?
With the old ones it would be around .005, to .007 thousandths.