Anodes ("Sacrificial"); Audible Alarm; Engine Systems; Cooling System - Volvo Penta DPX 500 Instruction Book

Anodes ("sacrificial") __________________________________________________________

Electrochemical corrosion of metal can cause very serious and expensive damage to drives,
propellers, propeller shafts, rudders, keels, and other equipment fitted to your boat. To protect your
investment, Volvo Penta sterndrive units are equipped with zinc anodes to provide protection
against galvanic (electrochemical) corrosion. These anodes are "sacrificial," or designed to erode
away faster than the metal on the transom shield and sterndrive.
Note: Boats that connect to an AC power source (shore power) will require protection against both galvanic and "stray
current" corrosion. For the added protection needed, a galvanic isolator may be installed in the grounding, or green,
wire between the boat and the shore power outlet on the dock. The isolator will block DC flow, but will permit the
passage of AC flow. If you are connected to an AC power source that is not equipped with a galvanic isolator, you
may need additional sacrificial anodes to handle the added corrosion potential.

Audible alarm ________________________________________________________________

The audible alarm will alert you to unacceptable or dangerously low oil pressure and/or high water temperature levels.
The audible alarm is capable of producing a warning sound up to 105 decibels. Prolonged exposure to this
audible alarm can cause hearing loss.

Engine systems _______________________________________________________________

Important engine systems include the cooling system, fuel system, exhaust system, electrical system, lubrication
system, and steering system.

Cooling system

The cooling system keeps the internal engine temperature below the boiling point of engine coolant. You will need to
take care of these cooling system components:
1. Raw water pump and impeller
2. Belts (may also be involved with other engine systems)
3. Hoses and clamps
4. Heat exchanger

Fuel system

The fuel system stores fuel for the engine, pumps gasoline through the fuel lines to the carburetor or fuel injectors,
and mixes fuel with air and sends the fuel-air mixture to the engine. You will need to take care of these fuel system
components:
1. Fuel pump
2. Fuel filter
3. Fuel lines
4. Fuel cooler
5. Fuel quality

Exhaust system

The exhaust system passes the exhaust gases from the burnt fuel-air mixture through the transom. You will need to
take care of these exhaust system components:
1. Hoses and clamps
2. Exhaust manifold

Electrical system

The electrical system generates, stores, and regulates the flow of electricity needed to start the engine, fire the fuel-air
mixture to run the engine, and operate any electrical accessories on your boat. You will need to take care of these
electrical system components:
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