1988-1992 Mercury Force 5HP Outboards Service Manual, Page 171Get this manual
JREASSEMBLING PISTON NOTE: It is very important that all parts, the work area and your hands are clean for reassemblyIf cylinders were honed, wash with warm soapy water and dry thoroughlyCoat cylinder walls with oil
IMPORTANT
Follow torque values closely when tightening screws
1Assemble piston to connecting rodCoat piston pin with oilApply few drops of oil to both piston pin holes in piston and to bearing in connecting rod