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Operation Manual Mitsubishi SS-Series diesel engines
Version 02/2003
COOLANT AND ANTIFREEZE SPECIFICATIONS
ENGLISH
9 COOLANT AND ANTIFREEZE SPECIFICATIONS
9.1 Coolant specifications
Water used in the engine cooling system must be
soft, or as free from scale forming minerals as
possible and it has to meet the requirements
shown in the "Coolant Specifications" chart.
The values indicated in ( ) are the limits set forth
by Mitsubishi. In addition to the items specified
above, turbidity is specified to be <15 mg/
l
.
9.2 Recommended types of LLC's
(Long Life Coolant)
For Mitsubishi diesel engines, all-season, non-
amine type LLC's or equivalents are
recommended.
9.2.1 Features of recommended brands
• No amines (methyl amines, ethyl amines, n-
propyl amines, etc., all being derivatives of
ammonia, NH
3
) are contained.
• Silicate and borate are not contained.
• Close to neutral on the pH scale, and hence,
slightly basic (alkaline).
• Balanced additive ingredients; some being
substitutes for amines.
• Long life (the coolant with 30% concentration,
for example, retains its effectiveness for more
than 2 years).

NOTE
Harmful chemical properties and substances
contained in water (as coolant) must not exceed
the Mitsubishi limits. They are tolerable up to the
limits shown in the chart below.
Item
Chemical
symbol
Unit
Recommended
limit
Main malign effect
Corrosion
and rust
Scale
formation
pH, 25°C (77°F) - -
6.5 to 8.5
(6.5 to 8.0)
O O
Electrical conductivity,
25°C (77°F)
- µ /cm
< 400
(< 250)
O O
Total hardness CaCO
3
PPM
< 100
(< 95)
- O
M alkalinity CaCO
3
PPM
< 150
(< 70)
- O
Chlorine ion Cl
-
PPM
< 100
(< 100)
-
Sulfuric acid ion SO PPM
< 100
(< 50)
O -
Total iron Fe PPM
< 1.0
(< 1.0)
- O
Silica SiO
2
PPM
< 50
(-)
- O
Residue from
evaporation
- PPM
< 400
(< 250)
- O
Table 10 Coolant specifications
Ω
2
4
–