Mercury Force 9.9, 15HP Outboards Service Manual, Page 136Get this manual
JREASSEMBLING PISTONS NOTE: It is very important that al 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
1Assemble piston to connecting rod