2. Remove the three bolts securing the clutch release bearing guide sleeve and slide the guide sleeve off the input shaft, along with the O-ring.
3. Using a screwdriver as a lever, carefully pry the sealing ring out of the guide bushing.
4. Check the condition of the gearbox input shaft surface mating with the sealing ring and, if there are any scratches or burrs, polish this surface or replace the input shaft.
5. Place a new sealing ring in the oil and install it on the release bearing guide sleeve.
6. Install a new O-ring onto the rear of the guide bushing.
7. Install the guide bushing into place by sliding it onto the input shaft.
8. Screw in the guide bushing mounting bolts, tightening them to the required torque.
9. Install the gearbox.