Propellers are frequently damaged by collisions with rocks, logs and other submerged objects. Any boat owner can remove and replace an outboard engine’s propeller with only a few basic tools. Actually repairing the damaged blades is a complex procedure requiring specialized metalworking skills, but unless the prop has lost multiple blades, a propeller shop can usually perform the repair for less money than a replacement would cost.
Removal - Check the pitch and diameter of the old prop. These numbers are stamped on the prop hub, in a form such as "14 x 22" for a prop 14 inches in diameter with a 22-inch pitch. If the boat performed well before the prop was damaged, you can use a replacement prop of a similar style and the same pitch and diameter. If the engine couldn't reach rated RPM or the boat had performance problems, consult with the prop dealer about using a different style or size of prop. Buy a new prop, or find a shop to repair the old one, before removing it.
Installation - Wipe the prop shaft clean and rub some waterproof grease on the splines. Slide the stopper back onto the shaft in the same orientation it was originally in. Slide the new or repaired prop onto the shaft, followed by the spacer and the washer.