Volvo Penta D25A MS, Operator'S Manual

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Maintenance: Freshwater system
Freshwater system
The Freshwater system is the internal cooling system. It is a closed system and must be filled with a coolant that
protects the engine from internal corrosion and freezing. Anti-corrosive additives become less efficient with age
and the coolant must therefore be changed in accordance with the recommendations in the maintenance sche-
dule.
WARNING! Never open the pressure cap when the engine is warm. Steam or hot fluid may spurt out.
WARNING! The coolant is dangerous to your health and an environmental hazard. Handle coolant with
care and dispose of old coolant in accordance with local regulations.
IMPORTANT! For coolant specification, refer to chapter “technical data” in the back of this manual.
IMPORTANT! Check the coolant level on a cold stationary engine.
IMPORTANT! Coolant to be added should have the same concentration as the coolant in the engine.
Do not add plain water.
IMPORTANT! Certain parts of the system are made of light alloy. Chemical additives must therefore not
be used when cleaning.
Coolant level check
MS engines
Make sure the level ends between the MIN and MAX
marks. If there are no marks, the coolant level should
be approximately 5 cm below the top of the filler cap.
Fill if necessary with the same type and concentration
of coolant that is already in the system. For coolant
specification refer to chapter “technical data” in the
back of this manual.
NOTE! Coolant to be added should have the same
concentration as the coolant in the engine. Do not
add plain water.
MT engines
The minimum cooling water level on a cold engine is
65 mm [from the bottom of the sight glass and up
(A)].
The cooling water level of a cold engine must never
reach higher than 5 mm below the top of the sight
glass. For coolant specification refer to chapter “tech-
nical data”.
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