Page 165 - REPOWER REFERENCE GUIDE (2020)

Corrosion Protection

Corrosion Protection
Mercury MerCruiser power packages are equipped with anodes to help protect them from galvanic corrosion under moderate
conditions. However, for severe conditions (i.e. when using a stainless steel propeller, docking or mooring in areas with rapid
water flow, etc.), it is recommended that a Quicksilver Anticorrosion Anode Kit or a MerCathode System be installed (some
models have a MerCathode System as standard equipment).

6
1

7
5
4 3 2 8

2 3

1

6
5

7 8

8716
4

1 - Gearcase anodic plate
2 - Ventilation plate anode
3 - Gimbal mounted anodic block
4 - MerCathode system
5 - Anode kit
6 - Trim cylinder anodes
7 - Bearing carrier anodes (Alpha only)
8 - Propshaft anode (Bravo III standard)

Boats connected to AC shore power require additional protection to prevent destructive low voltage galvanic currents from
passing through the shore power ground wire. A Quicksilver galvanic isolator can be installed to block the passage of these
currents while still providing a path to ground for dangerous fault (shock) currents.
IMPORTANT: If AC shore power is not isolated from boat ground, the MerCathode System and anodes may be unable to
handle the increased galvanic corrosion potential.

90-8M0149179 eng NOVEMBER 2018 © 2019 Mercury Marine Page 6D-3