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point, I don't recall the orifice being noticeably small. Air in the lines generally isn't the issue if the upper bleeder has been deleted. If the upper bleeder is still in place, air is most often the cause of clutch issues. I haven't seen all of the metric unions that people are installing, but the hole must be VERY small to cause the effect you describe. One possible cause of his problem that I didn't think of before is improper master cylinder push rod adjustment. When the piston inside the master cylinder is fully released, a port inside is uncovered that allows fluid to bleed back into the reservoir. As the fluid is heated, it expands, and needs a place to go. If the push rod is improperly adjusted the port is covered by the piston. As the heated fluid expands, it has no where to go except the slave cylinder, which causes a partial release of the clutch. I have seen this happen on brakes for the same reason. As the system warms up, the heated brake fluid expands, but can't bleed off into the master cylinder reservoir, and causes the brakes to partially apply. Dragging brakes causes heat, which compounds the problem by heating the fluid even more, until the brakes lock up. The car is moveable when the system cools. It is possible the same is happening here with his clutch.
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