3. Operation
3-7
3.4.2 Coolant
Coolant freezing could cause cracks of cylinder and radiator. Be sure to always use mixture of LLC
(antifreeze) and soft water (like tap water) of good quality.
When water with dirt, sand, or dust, or hard water such as well water (ground water) is used, deposits
can form inside the radiator or on the cylinder head and resulting in engine overheat from poor coolant
flow.
Adjust mixing ratio of coolant according to the temperature. (55% volume coolant is filled when the unit is
shipped from factory.) Use coolant within the range of its mixing ratio between 60%.
(If LLC (antifreeze) exceeds more than 60%, it may decrease its antifreezing effect.)
Mixing ratio of LLC (antifreeze) (reference)
Outside temperature (°F)
5
-4
-13
-22
-31
-40
-49
Outside temperature (°C)
-15
-20
-25
-30
-35
-40
-45
Mixing ratio (%)
30
35
40
45
50
55
60
Dispose of LLC (Antifreeze) in accordance with local laws and regulations.
3.4.3 Fuel
Never use fuel with sulfur content greater than 0.0015% (15 ppm).
Use only ultra-low sulfur fuel.
Dispose of fuel in accordance with local laws and regulations.
Diesel fuel is required to meet the following conditions.
Free from even minute dust particles
High optimum viscosity
High cetane number (more than 45)
High fluidity even at low temperature
Low carbon residue content
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