1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 197Get this manual
CYLINDER BLOCKCRANKCASE
Piston Disassembly
NOTE: Disassemble each piston separately, make sure components are not mixed1Remove piston pin clip and piston pinSeparate connecting rod from piston2Remove top ring and second
NOTE: If re-using rings mark their location (piston #1 or piston #2) for correct installation3Remove oil ring (bottom rail, top rail, and scraper)