2001 Mercury Mariner 50-60HP Factory Service Manual, Page 274Get this manual
CYLINDER BLOCKCRANKCASE
Piston Installation
NOTE: Cylinder bores must be clean before installing pistonsClean with light honing, as necessaryAfter honing, clean cylinder bores with water and detergentAfter cleaning, swab cylinder bores several times with engine oil and clean cloth, then wipe with clean dry cloth1Lubricate pistons, ringsand cylinder walls with engine oil2Install pistonconnecting rod assembly using piston ring compressor tool