The sealing rings are synthetic resin with chamfered ends. Check the condition of the sealing rings, and replace them only if they are worn, distorted, or damaged.
For a better fit, squeeze sealing rings together slightly before installing them.

Apply ATF to the new sealing rings, then install them on the secondary shaft.

After installing the sealing rings, verify the following:
The rings are fully seated in the groove.
The rings are not twisted.
The chamfered ends of the rings are properly joined.
Removal
Drain the engine coolant.
Remove the air cleaner.
Remove the heater hose clamp bracket mounting bolt (A) and the harness
holder mounting bolt (B).
...
Clutch Wave-Plate Phase Difference Inspection (A/T)
Place the clutch wave-plate (A) on a surface plate, and set a dial
indicator (B) on the wave-plate.
Find the bottom (C) of a phase difference of the wave-plate, zero the
di ...
A/F Sensor Replacement
Special Tools Required
O2 Sensor Wrench Snap-on S6176 or equivalent, commercially available
Remove the cowl cover and the under-cowl panel.
Disconnect the A/F se ...