The piston pin is a free floating piston pin. It is important that the piston and rod pin hole be clean and free of oil when checking pin fit.
Whenever the replacement of a piston pin is necessary, remove the ring retaining the pin. Then remove pin. Using tool J-29134 install piston pin retaining ring.
It is very important that after installing the piston pin retaining rings, that the rings be rotated to make sure they are fully seated in their grooves.