Volvo Penta D25A MS, Operator'S Manual

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Technical Data
Coolant specification
Always use Volvo Penta Coolant in the freshwater cooling circuit. Volvo Penta Coolant acts both as anti-freeze
agent and provides corrosion protection for the metal parts of the cooling system. Future claims might be rejec-
ted should Coolant 90 not have been used.
Important! Mixing other types of concentrated coolant with Volvo Penta Coolant, may decrease
corrosion protection and may damage the engine or block the cooling system.
Water
Always use clean water that complies with the requirements in ASTM D4985 X1.1. If these requirements are not
complied with, corrosion may occur, which would result in impaired cooling performance.
Total fixed particle content ..................................... < 340 ppm
Total hardness ....................................................... < 9,5 °dH
Chloride .................................................................. < 40 ppm
Sulphate ................................................................. < 100 ppm
pH value ................................................................. < 5,5 – 9
Silica ....................................................................... < 20 mg Si02/l
Iron ......................................................................... < 0.10 ppm
Manganese ............................................................ < 0.05 ppm
Conductivity ............................................................ < 500 ìS/cm
Organic content, CODMn ....................................... <15 mg kMnO4/L
Mixing ratio
The mixture of Volvo Penta Coolant and water should contain 40-55% Volvo Penta Coolant. If the coolant con-
tains less than 40% Volvo Penta Coolant, the cooling galleries in the engine or radiator may be blocked by con-
tamination. If the coolant contains more than 60% Volvo Penta Coolant the cooling ability of the coolant mixture
is impaired, this may cause the engine to overheat. Too high concentration of Volvo Penta Coolant also impairs
the frost protection.
Important! The mixture of Volvo Penta Coolant and water may never contain less than 40% Volvo
Penta Coolant.
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