Does anyone have one handy to check the ratio of linkage travel to throwout bearing travel?


Lawrenceville, GA

I've just rebuilt the T98 in Albatross. That's our '55 F500. I have the clutch fork in my hands. It is 5 & 5/8" from the rod center to the pivot center and 3 & 3/8" from the pivot center to the pins that push the throwout bearing. That calculates to be 1.66666666667/1 - give or take.
I hope that helps.

BTW: the casting bears the number TAAA7515B

I checked one of my spares and I get about 3 1/4 and 6 1/4. It looks like TAAK-7515-A.

The one on my truck is TAAK-7515-B. I only have a picture to go by but it looks to be the same by scale.

I guess all Truck forks are not the same.


Lawrenceville, GA

My guess would be that the difference may be related to different pressure plates

So would car clutch forks have a different ratio and if so, why?

Rono

  Ron Lane,  Meridian, ID

I reason (aloud) that, for a given transmission/bell housing, the distance from pivot to throw out will be the same. Then the distance from pivot to rod could be varied. This would cause a change in rod (pedal) travel, and a change in foot pressure required to overcome a given set of springs in the pressure plate.

I looked in my'57-'66 Truck parts catalog and any of those trucks with a Y would have used the same fork, part number B8C-7515-A (The numbers we gave above are engineering numbers), about 11" long, which matches my spare.
I wonder if the other fork is '54-'56?


Lawrenceville, GA

Charlie, I have a '56 clutch fork (at least it came in a "56) in the back shed. I can look at it tomorrow. What would you like me to check?

Mark

1956 Mercury M100
1955 Ford Fairlane Club Sedan
Delta, British Columbia

See how it compares to the dimensions we've posted and the number on it.


Lawrenceville, GA