Draining Coolant; Filling With Coolant - Volvo Penta D2-55 Workshop Manual

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Draining coolant

Stop the engine before draining the cooling system.
Freshwater system
WARNING! Do not open the filler cap when the
engine is hot, except in emergencies. Steam or
hot fluid may spray out
1. Place a suitable collection vessel beneath the en-
gine block drain plug (1) and at the heat exchang-
er drain tap.
2. Open the drain plug (1) and drain tap and drain all
coolant.
NOTE! Deposit the old coolant at a recycling station
for destruction.
Draining the seawater system
WARNING! Risk for flooding. Close the sea-
cocks before starting work.
1. Close the sea cock (1) or the valve on the S-
drive. Remove the cover (2) from the seawater
pump and let the water run out.
2. Undo the hose (3) from the seawater pump and
seawater filter at the reverser/drive and angle
them downwards to let the water out.
3. Check if there are extra taps/plugs at the cooling
and exhaust systems lowest points.
Check carefully that all the water runs out.
4. Tighten the hoses and the cover on the seawater
pump. Bilge-pump the boat
WARNING! Check that there are no leaks
in the seawater system.

Filling with coolant

Flush the cooling system clean before new coolant is
added.
Close all drain points and fill up with coolant to the
correct level.
The engine must be stationary when the cooling
system is filled, and must not be started until the
system is vented and completely filled. If a heating
unit is connected to the engine cooling system, the
heat control valve should be fully opened and the in-
stallation vented during filling.
Check the hoses and joints and rectify any leaks.
Fill the system slowly! Filling must not be done so fast
that air locks are formed in the system. The air should
be allowed to flow out through the filling opening. Check
the coolant level after the engine has been run for
about an hour. Top up with coolant as necessary.
Group 26 Cooling system
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