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The release lever operating mechanism of the clutch is known as the
throw-out bearing. This is a ball bearing, mounted on a sleeve or
collar, and it slides back ad forth on a hub. The hub is part of the
transmission front bearing retainer.
The factory fills the throw-out bearing with grease, so it doesn't
usually need service. Some cars use a graphite type, which is a ring
of graphite that presses against a plate attached to the clutch
levers.
The sleeve with the throw-out bearing moves in and out by means of a
throw-out fork; it rotates on a ball pivot stud.
When you disengage the clutch, the clutch pedal is all of the way
down. The throw-out fork forces the throw-out bearing into contact
with the pressure plate release levers, which pull the pressure plate
from the clutch disc to release it. Once released, the flywheel and
pressure plate continue to turn.
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