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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 pro-
tection against galvanic (electrochemical) cor-
rosion. These anodes are "sacrificial," or de-
signed to erode away faster than the metal on
the transom shield and sterndrive.
Use only genuine Volvo Penta zinc and
magnesium anodes. Some aftermarket anodes may not
meet mil-specs and are larger in size. Using aftermarket stern-
drive anodes may cause cavitation bubbles due to poor fit,
which may lead to propeller erosion. When you must replace
the anodes, see your Volvo Penta dealer, since if additional
electronic or electrical equipment is installed, each must have
an individual anode or grounding device, and all grounding
devices must be interconnected.
NOTE! If you have a stainless steel propeller, you may need
additional sacrificial anodes or a Volvo Penta ac-
tive corrosion protection system to handle the added
corrosion potential. Your Volvo Penta dealer will help
you to decide which is more appropriate for your
boat.
NOTE! Boats that connect to an AC power source (shore
power) will require protection against both galvanic
and "stray current" corrosion. For the added pro-
tection 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 isola-
tor 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 (optional)
The optional audible alarm will alert you to unacceptable or
dangerously low oil pressure and/or high water temperature
levels. It is usually mounted under or near the instrument
panel.
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Engine systems
Important engine systems include the cooling system, fuel
system, exhaust system, electrical system, lubrication sys-
tem, 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 (standard on Fresh Water Cooling Sys-
tem models)
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 en-
gine. You will need to take care of these fuel system compo-
nents:
1. Fuel pump
2. Fuel filter
3. Fuel quality
Exhaust system
The exhaust system passes the exhaust gases from the burnt
fuel-air mixture through exhaust hoses to and out the drive.
You will need to take care of these exhaust system compo-
nents:
1. Hoses and clamps
2. Exhaust manifold
3. Exhaust riser
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 acces-
sories on your boat. You will need to take care of these elec-
trical system components:
1. Battery and connections
2. Circuit breakers and fuses
3. Distributor cap and rotors
4. Spark plugs
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