Originally Posted by
Semlinger
The light blue coleration indicates a polished cast steele surface has reached 700 degrease, the dark blue 650, the dark straw 600 and the light straw less. light straw is the first color you see when you heat cast steele. If it is not rough I would leave it on. Does the throw out bearing feel rough when you load it lightly by hand and turn it?
Is the throw out the same thing as the release bearing on the hydraulic slave cylinder? If so, it's really smooth no catching or noise. No play from side to side seems solid. Its apparent when you rotate it that the grease is still intact due to a fluid movement. I would say its in good condition.
Release Bearing Pic