30
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
follows. Close the drain cock and fill with fresh cool-
ant.
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
correct level. Reinstall the filler cap.
Coolant. Draining
Position a container on the starboard side of the
cylinder block. Remove the filler cap on the heat
exchanger (this lets the coolant run out faster). Open
the drain cock or remove the plug and drain all the
coolant. Before filling with coolant clean the heat
exchanger as follows.
NOTE! Deposit old coolant at a properly designated
disposal site.
7741986 - Downloaded from www.volvopenta.com 06/10/2006 13:10:27