6-1
Chapter 6 COOLANT
Note: In this operation manual, the word "coolant" represents a mixture of water and LLC.
Recommended Water for Coolant
Use soft water (such as tap water) for the engine cooling system. The water quality must meet the requirements in
the table below. Basically, the water quality should be within the recommended value, however, up to the limit is
acceptable.
Note: Other than those above, turbidity must be below 15 mg/liter.
Long Life Coolant (LLC)
Be sure to use Mitsubishi Heavy Industries, Ltd. genuine long life coolant (LLC), "GLASSY long life coolant (ethyl-
ene glycol type)" or "PG GLASSY long life coolant (propylene glycol type)." If you have to use other brand LLCs, be
sure to use the non-amine type LLC that meets the requirements by Mitsubishi Heavy Industries, Ltd.
Mitsubishi heavy industries, Ltd. disclaims the warranty claims about malfunctions due to the use of LLC that does
not meet our requirements.
Genuine LLC
Mitsubishi Heavy Industries, Ltd. recommends the use
of our genuine long life coolant "GLASSY long life
coolant (Ethylene glycol type)", and Eco-friendly prod-
uct "PG GLASSY long life coolant (propylene glycol
type)", which are most appropriate coolant for Mitsubi-
shi diesel engines. Be sure to use our Genuine LLC.
Fig. 6-1 GLASSY - LLC
Table 6-1 Water quality standards
Item
Chemical
symbol
Unit
Recommend
value
Limit Main adverse effect
pH (25 °C [77 °F]) - - 6.5 to 8.0 6.5 to 8.5
Corrosion and rust, scale
formation
Electrical conductivity
(25°C [77°F])
- mS/m < 25 < 40
Corrosion and rust, scale
formation
Total hardness CaCO
3 ppm < 95 < 100 Scale formation
M alkalinity CaCO
3 ppm < 70 < 150 Scale formation
Chlorine ion Cl
-
ppm < 100 < 100 Corrosion and rust
Sulfuric acid ion SO
4
2-
ppm < 50 < 100 Corrosion and rust
Total iron Fe ppm < 1.0 < 1.0 Scale formation
Silica SiO
2 ppm < 30 < 50 Scale formation
Residue from evaporation - ppm < 250 < 400 Scale formation
Should coolant or LLC be accidentally swallowed, induce vomiting immediately and seek medical attention. If LLC
should enter eyes, flush immediately with plenty of water and seek medical attention.
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