| Outboard Engine Tune-up: Inspecting Sacrificial Anodes |
From "Shipshape Boating"
episode DSSB-101 |
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The final step in maintaining your outboard engine is to inspect the sacrificial anodes: - Trim Tab Anode -- These come in a variety of metals: aluminum, magnesium and zinc. Aluminum and magnesium anodes are for fresh water, and the zinc is for salt water boating. Once anodes have deteriorated by 50 percent or more, they should be replaced. These anodes serve two different functions:
- The trim tab anode, for example, counters the engine's natural tendency to pull off to the right as your running a vessel that has a single outboard on it. Naturally a right-hand rotating motor, when engaged in forward, spins to the right. The trim tab anode, by being cocked off in the opposite direction, counters the spin to the right. This means when the boat is running down the waterway, you can take your hands off the wheel and the boat will continue to run straight.
- The reason these anodes are called "sacrificial" is because once the electric current from the water attacks the weaker metal anode it can be replaced easily instead of damaging more important -- and expensive -- parts (such as the aluminum housing and steel props) on the boat.
- Corrosion Control Anode -- The name says it all. This anode protects against corrosion, and when it becomes about 50 percent eaten, it's time to replace it.
RESOURCES :
Troubleshooting Gasoline Marine Engines
Model: 1892216280
Author: John Fleming
(January 2001)
To order this title from Amazon, click here.
Bristol Fashion Publications
Boat Engines: A Motor Boat and Yachting Book
Model: 1898660042
Author: Dick Hewitt
Order this book from Amazon.com.
Fernhurst Books
Boat Repair Made Easy -- Engines -- Diesel and Gasoline ...
Model: 1892216035
Author: John P. Kaufman
Order this book from Amazon.com.
Bristol Fashion Publications
Outboard Motor Engines: Maintenance, Troubleshooting and Repair
Model: 0070578567
Author: Edwin R. Sherman
(April 1997)
To order this title from Amazon, click here.
Ragged Mountain Press
Camden, ME 04843-0220
Phone: 207-236-4837
Fax: 207-236-6314
Outboard Motor Service Manual
Model: 0872884643
Author: Intertec
To order this title from Amazon, click here.
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