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Coolant. Changing
The corrosion-proofing additives become less effec-
tive with time and the coolant must be changed. If the
freshwater system is filled with antifreeze mixture it
must be changed every other year. If the system is
filled with anti-corrosion agent mixture it must be
changed every year.
Drain the coolant and clean the heat exchanger as fol-
lows. Close the drain cock and fill with fresh coolant.
Heat exchanger. Cleaning
Cooling performance is reduced by scaling in the heat
exchanger. It should therefore be flushed when the
coolant is changed.
1. Drain the coolant as above.
2. Insert a hose into the filler pipe on the heat ex-
changer. Flush the fresh water until the water
which runs out of the drain cocks is clean. Allow
all the water to run out.
3. Close the drain cock. Fill with new coolant to cor-
rect level. Reinstall the filler cap.
Coolant. Draining
Position a container under the drain cock on the star-
board side of the cylinder block. Remove the filler
cap on the heat exchanger (this lets the coolant run
out faster). Open the drain cock and drain coolant.
Clean the heat exchanger as follows before filling
coolant.
NOTE! Deposit old coolant at a properly designated
disposal site.
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