1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 257Get this manual
GEAR HOUSING
Propeller Installation
WARNING
If gear housing is NOT removed from drive shaft housing, BEFORE attempting to remove or install the propeller, remove (and isolate) spark plug leads from spark plugs to prevent engine from starting accidentally1Apply Anti-Corrosion Grease to propeller shaft2Install inner thrust hub3Slide propeller onto shaft4Install outer thrust hub5Thread propeller nut onto shaft