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.
Countershaft Reassembly (M/T)
Exploded View
Special Tools Required
Driver Handle, 40 mm I.D. 07746-0030100
Bearing Driver Attachment, 25 mm I.D. 07746-0030200
Bearing Driver Attachment, 30 mm I.D. 07746-0030300
Bear ...
Replacement (Part -2)
Install the brake caliper piston compressor (A) on the caliper body (B).
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Engine Does Not Start
Checking the Engine
If the engine does not start, turn the ignition switch to START
and check the
starter.
If you must start the vehicle immediately, use an
assisting vehicle to jump start it. ...