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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 off the coolant and clean the heat exchanger as
in the following paragraphs. Close the drain tap and
the drain plug, and fill up with new 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 filling pipe on the heat ex-
changer. Rinse with fresh water until the water
which runs out of the drain tap and the engine
block is clean. Let all the water run out.
3. Close the drain tap and the drain plug. Fill up with
coolant to the correct level. Put the filler cap back.
Coolant. Draining
Put a suitable collection vessel underneath the engine
drain plug (1) and underneath the heat exchanger drain
tap (2). Remove the filler cap on the heat exchanger
to let the coolant run out faster. Open the drain plug
(1) and the drain tap (2) and drain off all coolant.
Before new coolant is put in, clean the heat exchanger
as in the following paragraphs.
NOTE! Deposit old coolant at a properly designated
disposal site.
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Maintenance: Freshwater system
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