Mercury Mariner Service Manual 6, 8, 9.9 210CC Sailpower, Page 116Get this manual
PROPELLER INSTALLATION
4Install thrust hub (a)5Start propeller nut (b) on shaft by hand6Place block of wood (c) as shown, to prevent propeller from rotating and to protect hands; torque nut (b) to 70 Ibsin (8 N.m)
AWARNING
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 accidentally