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By charliemccraney - 10 Years Ago
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Does anyone have one handy to check the ratio of linkage travel to throwout bearing travel?
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By The Horvaths - 10 Years Ago
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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.
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By The Horvaths - 10 Years Ago
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BTW: the casting bears the number TAAA7515B
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By charliemccraney - 10 Years Ago
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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.
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By The Horvaths - 10 Years Ago
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My guess would be that the difference may be related to different pressure plates
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By Rono - 10 Years Ago
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So would car clutch forks have a different ratio and if so, why?
Rono
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By The Horvaths - 10 Years Ago
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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.
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By charliemccraney - 10 Years Ago
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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?
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By lyonroad - 10 Years Ago
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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?
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By charliemccraney - 10 Years Ago
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See how it compares to the dimensions we've posted and the number on it.
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By slick56 - 10 Years Ago
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This is from a bellhousing off a B9 block with hydraulic clutch.
I do not know if that would make a difference to the pivot point.
I also do not know how big the truck was.
 From pivot point to throwout bearing c/l is approx 3-1/4" From pivot point to clutch rod c/l is approx 6-1/4"  Part no. is TAAK-7515-B . |
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By lyonroad - 10 Years Ago
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charliemccraney (1/18/2014)
See how it compares to the dimensions we've posted and the number on it.
The number is TAAA-7515B. Dimensions are 5 3/4" x 3 3/8". I measured with set of dividers. The fork is from a '56 Mercury M100 witha 272, 11" clutch and a light duty 3 speed trans. Hope this helps
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By The Horvaths - 10 Years Ago
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Same casting as mine but I measured with a rule and one eye.
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By lyonroad - 10 Years Ago
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Rono (1/17/2014)
So would car clutch forks have a different ratio and if so, why?
Rono
I agree with Horvaths. Probably for increased leverage. Some trucks had 10.5", 11" and 12" clutches (pressure plate springs were different). Also cars had the big helper spring on the pedal while trucks had the through the floor thigh-master style pedal.
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By charliemccraney - 10 Years Ago
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Cool! So it looks like '54-'56 and '57-'64 are different.
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By Park Olson - 10 Years Ago
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My '56-'57 book shows TAAA 7515B for '56 and B7C 7515A for '57,,,,,10 5/8 and 11 1/4 approx. length respectively
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