Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 206Get this manual
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 Quicksilver Anti-Corrosion Grease to propeller shaft2Install inner thrust hub3Slide propeller onto shaft4Install outer thrust hub5Thread propeller nut onto shaft