Replacing Heat Exchanger Anodes
These engines have a sacrificial anode
A
located in
the heat exchanger, as shown in the illustration.
Anodes are slowly eroded away by galvanic action and
require inspection. Additionally, anodes that are
subjected to frequent wetting and drying require
periodic scraping with sandpaper to remove scale and
oxidation to maintain their effectiveness.
When you need to purchase new anodes, see your
Volvo Penta dealer. The material composition of Volvo
Penta anodes meets U.S. Military Specification 18001-
H. Some aftermarket anodes may not meet mil-specs.
Inspecting Heat Exchanger Anodes
The anode
A
resembles a bolt and may be removed
and replaced using a 3/4 inch (19mm) wrench. If the
anode is more than 30% eroded, it should be replaced.
When installing, tighten the anode all the way by hand,
then turn an additional quarter turn using a wrench.
Checking Engine Coolant for Freeze
Protection
NOTICE!
Engine damage is possible during freezing
temperatures if coolant mix is not correct .
If the boat/engine will be stored or used in an area with
freezing temperatures, the coolant mixture must be
checked to insure it has adequate temperature
protection properties. As part of winterization, Volvo
Penta highly recommends that the coolant be checked
for correct freeze protection. Use a coolant test kit
(hydrometer) to check a sample of the coolant. The
temperature indicated by the hydrometer should be at
least 10º F (6°C) lower than the lowest expected
temperature for the area where the engine will be
stored. Check the coolant at ambient temperature, do
not check hot coolant (safety and inaccurate reading
concerns).
The coolant solution can be strengthened to protect at
lower temperatures by draining half a gallon of coolant
from the engine and replacing with a half gallon of full
strength antifreeze solution. Run engine for 10 minutes
to ensure proper mixing of solution and recheck for
level of protection. Repeat, if necessary, until the
indicated level of protection is at least 10° F (6°C) lower
than the projected lowest temperature for the local
area.
See your Volvo Penta dealer for assistance with this
test.
P0015645
P0012894
Maintenance
90
47707742 09-2016 © AB VOLVO PENTA
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