Maintenance Section
-108-
Coolant Water
Hard water, or water with high levels of calcium and
magnesium ions, encourages the formation of insoluble
chemical compounds by combining with cooling system
additives such as silicates and phosphates.
The tendency of silicates and phosphates to precipitate
out-of-solution increases with increasing water hardness.
Hard water, or water with high levels of calcium and
magnesium ions encourages the formation of insoluble
chemicals, especially after a number of heating and
cooling cycles.
DOOSAN prefers the use of distilled water or deionized
water to reduce the potential and severity of chemical
insolubility.
Acceptable Water
Water Content Limits (PPM)
Chlorides (Cl) 50 maximum
Sulfates (SO4) 50 maximum
Total hardness 80mg/l
Total solids 250 maximum
PH 6.0 to 8.0
ppm = parts per million
Using water that meets the minimum acceptable water
requirement may not prevent drop-out of these chemical
compounds totally, but should minimize the rate to
acceptable levels.
Antifreeze
NOTICE
DOOSAN recommends using automotive antifreeze
suitable for gasoline engines having aluminum alloy
parts. Antifreeze of poor quality will cause corrosion of
the cooling system, and thus always use automotive
antifreeze prepared by a reliable maker, and never use
it mixed with antifreeze of different brand.
DOOSAN recommends that the coolant mix contain
50% commercially available automotive antifreeze, or
equivalent and acceptable water to maintain and
adequate water pump cavitation temperature for
efficient water pump performance.
Premix coolant solution to provide protection to the
lowest expected outside (ambient) temperature. Pure
undiluted antifreeze will freeze at –23°C (-10°F).
Use a greater concentration (above 50%) of
commercially available automotive antifreeze only as
needed for anticipated outside (ambient) temperatures.
Do not exceed the recommendations, provided with the
commercially available automotive antifreezes,
regarding the coolant mixture of antifreeze to water.
Make proper antifreeze additions.
Adding pure antifreeze as a makeup solution for cooling
system top-up is an unacceptable practice. It increases
the concentration of antifreeze in the cooling system
which increase the concentration of dissolved solids and
undissolved chemical inhibitors in the cooling system.
Add antifreeze mixed with water to the same freeze
protection as your cooling system.
Use the chart below to assist in determining the
concentration of antifreeze to use.
Antifreeze Concentrations
Protection Temperature Concentration
Protection to -15°C (5°F)
30% antifreeze and 70%
water
Protection to -23°C (-10°F)
40% antifreeze and 60%
water
Protection to -37°C (-34°F)
50% antifreeze and 50%
water
Protection to -51°C (-60°F)
60% antifreeze and 40%
water
To Next Page
Loading...
Need help?
General
