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.
Brake Master Cylinder Inspection
Remove the master cylinder.
Inspect and note these items:
Before reassembling, check that all parts are free of dirt and other
foreign particles.
Do not t ...
Map Scale Commands
Display north up
Display heading up
Display zoom in
Display zoom out
Display (specify scale):
1/20 mile (80 m) scale
1/8 mile (200 m) scale
1/4 mile (400 m) scale
1/2 mile (800 m) scale
1 mil ...
Rocker Arm Assembly Installation
If the rocker arm assembly is disassembled, reassemble the rocker arm
assembly.
Apply engine oil to the end of the valve stem.
Install the rocker arm assembly.
...