To maintain the propeller -- or even replace it -- it must first be removed from the propeller shaft.
- The propeller is held in place by a cotter pin, which must be straightened with pliers (figure A) before it can be pulled from the center of the propeller.
- After removing the cotter pin, it's time to remove the next nut, called the keeper (figure B).
- Removal of the keeper gives access to the prop nut. To remove the prop nut, first "block" one of the propeller blades with a piece of wood to prevent the propeller from rotating. Use a propeller wrench (figure C) to break the prop nut free and back it off the propeller shaft.
- Slide the propeller off (figure D) the shaft to reveal the splines (the grooves on the shaft). The thrust washer should be visible. The thrust washer keeps the propeller from grinding against the gear case housing. Add tripel-guard grease in a thin film to the thrust washer and propeller shaft (figure E) -- add a quality marine grease at least once a season -- to prevent the thrust washer from seizing to the shaft.
- After adding grease, it's a great time to inspect the prop shaft seal. Check for monofilament fishing line, which can become entangled around the propeller shaft and cut into the seal. This can allow water into the gear case, causing gear failure.
- Replace the parts in the order they came off: the thrust washer, propeller, and prop nut. Use a torque wrench to tighten to manufacturer's recommendation in foot-pounds (figure F) , then add the keeper over the prop nut and a new cotter pin through through the propeller shaft ( to secure the propeller and keep the prop nut from working loose). Bend the cotter pin with pliers to secure, and you're finished!
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