03-16-2016, 06:24 PM
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CC Member
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Join Date: May 2006
Location: Manchester,
MO
Cobra Make, Engine: Hurricane - FE
Posts: 627
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Not Ranked
As the throwout arm moves back and forth, it forms an arc that the pushrod from the slave cylinder must follow. The movement the rod must make needs to be balanced on both sides as much as possible, or you will get wear.
In an ideal world, the rod from the slave to the arm would be perpendicular when the arm is at 50% of its travel. No way you're going to eyeball that. If your rod is perpendicular at the start, move it to end of stroke and notice how much out of line it is at that point. You need to split the difference or you're loading the piston when it is at full stroke.
The piston is only lubricated by what fluid may be in the grain of the cast iron housing so any side force becomes a real issue.
The arm they are using for the throwout may not be the exact one that Ford designed the slave for back in the 60's and that only adds to the mis-alignment potential.
One way to keep an eye on this is to occasionally lift the rubber boot of the slave cylinder, looking for ANY fluid leakage. As soon as you see some, be prepared for eminent failure.
FYI
Paul
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