1988-1995 Mercury Force 5HP Outboards Service Manual, 90-823263 793, Page 172Get this manual
5Install piston ring on piston Use ring expander (Special Tool NoFT-8926) IMPORTANT
Piston rings must be installed with bevel on inner diameter positioned up toward top of pistonNO TE: On 1990B Models and Newer both rings are rectangularThere is no bevel