Mercury Force 9.9, 15HP Outboards Service Manual, Page 196Get this manual
AS NEEDED Disassemble motor leg
Pry out driveshaft seal (AlRemove waterline spring {Bl(1984-1990 "An Models) Press out waterline (el from top of motor leg using tool with same diameter as waterlineRemove waterline sleeve
Remove thermostat 1992" model and newerRemove insert (0)1992" models and newer