1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 15Get this manual
Propeller Replacement REMOVAL
INSTALLATION
1Coat the propeller shaft with Quicksilver Anti-Corrosion GreaseIMPORTANT: To prevent the propeller hub from corroding and seizing to the propeller shaft, especially in salt water, always apply coat of Quicksilver Anti-Corrosion Grease to the entire shaft at the recommended maintenance intervals and also each time the propeller is removed
If the propeller shaft is rotated while the engine is in gear, there is the possibility that the engine will crank over and startTo prevent this type of accidental engine starting and possible serious injury caused from being struck by rotating propeller, always shift outboard to neutral position and remove spark plug leads when you are servicing the propeller[
1Shift the outboard to neutral position2Remove the spark plug leads to prevent engine from starting 3Straighten the bent tabs on the propeller nut retainer