Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 253Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 253

CYUNDER 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 1Lubricate pistons, ringsand cylinder walls with engine oil2Install pistonconnecting rod assembly using piston ring compressor toolNOTE: Install used pistons in theiroriginallocations(cylinders)Install piston with "UP" mark on piston crown facing toward the flywheel end of block

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