Similar symptoms: At the start of a drive, everything is great. All gears shift smoothly, clutch engages about half way up the pedal stroke. Drives like it is supposed to. After about 10 - 15 minutes, the clutch won't fully disengage at full stroke.
http://www.realbig.com/piperma...010-June/123749.html
Solution: That problem was that the new slave did not fit snugly into the hole in the holding bracket which allowed a slight movement of the slave.
http://www.realbig.com/piperma...010-June/124010.html
Scroll down the page to "Clutch Help" to read the complete saga.
http://www.realbig.com/piperma.../subject.html#123762
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