Abstract: A marine propulsion device is provided including a propulsion unit adapted to be mounted on a boat for pivotal movement relative thereto about a generally vertical steering axis, the propulsion unit having a propeller shaft supporting a propeller, an internal combustion engine drivingly connected to the propeller, and a corrosion protection system, which device also includes at least one bushing made of a conductive plastic to allow a path for electrical connection to the corrosion protection system to be established across the bushing.

Abstract: A lower unit for a marine propulsion device, which lower unit comprises a drive shaft housing having a lower end, a gear case housing connected to the lower end of the drive shaft housing, a propeller shaft located in and extending axially through the gear case housing, a member for rotatably supporting the propeller shaft inside the gear case housing, which member is located in the gear case housing, which is in encircling relationship to the propeller shaft, and which includes therein an open area in communication with the environment outside of the gear case housing, a sacrificial anode in the open area, and a fastener for releasably securing the sacrificial anode in the open area.

Abstract: The marine propulsion device lower unit includes a housing having a lower portion submerged in water and defining an internal passage communicating with the water. Corrosion protection for both internal and external parts of the lower unit is provided by a sacrificial, galvanic-type anode mounted on the submerged portion of the housing and including a first or outer portion having a surface exposed to water exterior to the lower unit and a second or inner portion having a surface exposed to water present in the passageway.