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Old 10-25-2010, 01:51 PM
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kitcarbp kitcarbp is offline
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Join Date: Jun 2004
Location: Potomac, MD
Cobra Make, Engine: West Coast, 460 Ford Racing Crate w/ TREMEC TKO 600
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Default Update

So I made a crude GO NO-GO gauge from copper wire and I measured the total movement of my Mcleod HTOB and my crude wire "gauge" measured about 0.390" of HTOB movement for my total clutch pedal travel to the floor board. The Mcleod info i have, states 0.375" PP finger movement is required to release the disc. This make sense so far because, I also placed the car up on ramps while in gear with engine off and confirmed the clutch disc does in fact release upon pressing the clutch pedal down about 3/4 way, and the car rolls off the ramps. I still have just 1.0" of master cylinder travel compared to 1.10" possible. I also confirmed I would have to remove my pedal stop completely to get more than 1.0" stroke at the MC. May try this tonight to get 1.1 " at MC to see if I can get 0.420" or more total travel @ HTOB. It seems the PP is not fully releasing the disc and keeps spinning the input shaft.

I also attached my Mity-Vac brake bleeder hand pump to the HTOB bleed line and tried to pull any trapped air out of the assembly. After pulling more than 20 oz. of fluid through it with the Mity-Vac hand pump , I am still seeing air bubbles coming out of the bleed line! (reservoir was always kept 3/4 full, it never dropped too low during the bleed process)

I am still stumped, where is the air coming from ? I have yet to try the old fashion pump the pedal and bleed with a helper. Do I need to go back and open the Master Cly bleed screw on my Wilwood MC and re-bleed the MC ? My belief is that @ 0.390" its still not enough PP movement to completely stop the input shaft from turning. I can still move the HTOB bearing another 0.120" before I over extend it, 0.500" is max travel of the HTOB according to Mcleod.

What I have not confirmed yet is if the HTOB piston is moving proportionally
to the MC stroke of 1.0", if it does not, its got air in the lines (which the bubbles are confirming) Dah !.

I'll be back at it this week, any other tidbits appreciated.

Thanks
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Last edited by kitcarbp; 05-23-2011 at 10:09 AM..
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