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 (Non-amine type)" as coolant. When using other brand LLCs by
necessity, be sure to use the non-amine type LLC that meets the specification in Mitsubishi Heavy Industries, Ltd.
Mitsubishi heavy industries disclaims the warranty claims about malfunctions due to the use of LLC that does not
meet the following specification.
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
42-
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.
