How to Remove a Propeller From a Mercruiser Outdrive

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Removing a propeller from a Mercruiser outdrive is not difficult; it can be accomplished with just a few tools. However, it is important to immobilize the engine so there is no chance it will start during this procedure.

Items you will need

  • 1 1/16-inch wrench

  • Block of wood

  • Screwdriver

  • Hammer

  • Waterproof grease

Tilt the outdrive up as far as possible. Pull the coil wire to disable the ignition. Bend the three tabs on the lock ring behind the nut so that they are straight and do not interfere with the removal of the nut.

Place a block of wood between the propeller blade and the cavitation plate, then remove the nut with the 1 1/16-inch wrench by turning the nut counterclockwise.

Remove the lock ring and the bronze drive sleeve. Remove the propeller and the thick bronze thrust washer behind it.

Lubricate the shaft with waterproof grease. Slide the thick bronze thrust washer, propeller, bronze drive sleeve and lock ring onto the shaft. Screw on the 1 1/16-inch nut.

Tighten the nut to 52 foot-pounds of torque. Bend the tabs on the lock ring behind the nut to prevent the nut from coming loose. Push the coil wire back on.


  • Don Bowman, A.S.E. Certified Mechanic

About the Author

Don Bowman has been writing for various websites and several online magazines since 2008. He has owned an auto service facility since 1982 and has over 45 years of technical experience as a master ASE tech. Bowman has a business degree from Pennsylvania State University and was an officer in the U.S. Army (aircraft maintenance officer, pilot, six Air Medal awards, two tours Vietnam).