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.
FTP Sensor Replacement
Remove the EVAP canister.
Disconnect the FTP sensor connector (A).
Disconnect the hose (B), remove the retainer (C), and remove the FTP
sensor (D).
Ins ...
Gearshift Mechanism Replacement (M/T)
NOTE: Make sure not to get any silicone grease on the terminal part of the
connectors and switches, especially if you have silicone grease on your hands or
gloves.
...
A/C Refrigerant Oil Replacement (With A/C)
Special Tools Required
Oil Injector Tool Robinair ROB16256, commercially available
*This tool is available through the Honda Tool and Equipment Program; call
888-424-6857
Recommended PA ...