Seal material will stretch as it is fitted to the ring
groove. If you let the piston sit with the seal rings in
place, it will become easier to install it in the
limit damage to the piston ring (Figure 157).
The housing will have a beveled chamfer on one
end of the piston housing. The piston is installed
through that end of the housing. Light taps with a
soft hammer may be required on the end of the
piston to move it into the housing (Figure 158).
You will have to work the piston ring past the
pi-nion gear opening in the cylinder bore carefully.
While maintaining pressure on the end of the piston,
press the piston seal into the ring groove. As
the piston ring is compressed into the ring groove
the piston will slide further into the bore until the
piston ring has passed the pinion gear opening