Anode Inspection And Installation - Mercury 25 EFI Service Manual

3. Rotate the driveshaft while seating the bearing carrier assembly into the gear housing to ensure pinion gear and reverse
gear are in mesh.
Tube Ref No.
2-4-C with PTFE
95
4. Secure the bearing carrier with two screws. Torque the screws to specification.
a
Description
Bearing carrier assembly screws

Anode Inspection and Installation

1. The gearcase has an auxiliary water pickup/strainer located under the anti‑ventilation plate. This auxiliary water pickup/
strainer is designed to provide water to the engine should the primary water pickup/strainers on the side of the gearcase
become partially blocked with debris. The auxilary pickup should be inspected periodically for debris. Debris can be
removed from the strainer and the adjacent cavity by removing the attaching screw.
2. The anode/trim tab located under the anti‑ventilation plate serves two purposes:
a. As an anode it helps protect the outboard against galvanic corrosion by sacrificing its metal to be slowly eroded
instead of the outboard metals. It requires periodic inspection especially in salt water which will accelerate the
erosion. Replace the anode before it is completely eroded. Never paint or apply a protective coating on the anode as
this will reduce the effectiveness of the anode.
b. As a trim tab, it helps balance the steering torque so that the steering wheel or tiller handle will move with equal effort
in either direction. As the anode/trim tab erodes, its ability to balance steering torque will be reduced. To adjust the
anode/trim tab, loosen the screw which secures the anode/trim tab and turn the trailing edge of the tab in the direction
in which the boat turns more easily. For example ‑ if the boat turns more easily to the left, turn the trailing edge of the
tab to the left. If the boat turns more easily to the right, turn the trailing edge of the tab to the right.
90-8M0105568 eng MARCH 2016
a
16918
Description
a - Screws
16915
a - Bearing carrier assembly
b - Propeller shaft
b
Where Used
Bearing carrier O-ring
© 2016 Mercury Marine
Gear Housing
Part No.
92-802859A 1
Nm lb. in. lb. ft.
13 115
Page 6A-41
9