Master cylinder shaft

[jfish]

I removed the master cylinder from my 1946 P15.  (Note that the service manual was not helpful.)

This MC shaft does not have a pin (part number 856013) holding it in place. There is not even a hole for it.

It appears that the shaft is just pressed into the casting. The casting part # is 863 425 which matches the parts book.

Was there a running change made by the factory?

Has anyone had to remove this shaft that I assume is pressed into the master cylinder body? I will need to use in the new MC I ordered from Bernbaum.

[Bryan]

Oh crud..same thing I was playing with late this afternoon. Didn't have a C clamp tool..stopped before I got ticked off. Let's engineer it with C clamps in the tightest space possible. And make the pedal arms one solid piece so you can't move it forward to get out.

[jfish]

I agree, it's a major pain with the c-clips and the long pedal arms.

I can get most of the c-clips off by using a putty knife (about 1.5") to push on the ears of the clip. This usually forms an opening at the other end of the clip where you can slip in a small screwdriver and pry on it. Usually have to switch to a bigger screwdriver till it pops off.

For the pedal arms you need to remove the rubber pedals and a steel plate where the pedal arms come thru the floor board. Then you can get the long arms thru the floor. 

If you unbolt the MC you can remove the brake pedal arm and slide out the MC with the clutch pedal arm still attached.

 

[Bryan]

Exactly how I usually do C clips..just these were big ones. I saw the plate on the firewall.  Was trying to avoid that.  Anyway.. getting that pin out might require heating the body of the old MC up and tapping it out.  Oil and smoothing the rust out on the pin with some 600-1000 grit sand paper might help.  Just enough to smooth it. The problem might be getting the pin in the new body. Probably can't heat the body up too much, might damage the rubber parts.  One thing I did with a ring and pinion set (getting the ring gear on the carrier) - I froze the carrier in the freezer (-4F) and heated the gear.  On this one you could freeze the pin and slightly warm the MC body. Once you get it in and going straight don't stop.

[Bryan]

Thanks for the info on that..if all else fails I'll get in the car (with me all cleaned up) and remove pedal as you said.

[RobertKB]

It’s a pressed fit. If you can’t do it, any decent local mechanic or machinist can. 

[jfish]

It seems originally the shaft in the MC was a slide fit and the PIN was used to locate it side to side.