6 COOLANT
Mitsubishi Diesel Engine S12R OPERATION & MAINTENANCE MANUAL
111
Pub. No. 291Y1-40720 Revision: 5
6 COOLANT
This chapter describes coolant to be used. In this manual, the word "coolant" represents a mixture of water and
LLC.
Water to Be Used
Use soft water (tap water) which meets the requirements specified in the table below.
• In addition to the items specified above, turbidity must be below 15 mg/L.
• Basically, the water quality should be within the range of the recommended values,
however, up to the limit value is acceptable.
When you add water to coolant, use only the water that meets the water quality standard
specified in this Operation & Maintenance Manual.
* Otherwise, premature corrosion or overheating in the engine parts may occur.
Table 6-1 Water Quality Standard
pH
(25°C
[77°F])
Electrical
conductivity
(mS/m)
Total hard-
ness
M alkalinity
Chlorine
ion
Sulphate
ion
Total
iron
Silica
Residue by
evaporation
mg/L
Recom-
mend
value
6.5 to 8.0 ≤ 25 ≤ 95 ≤ 70 ≤ 100 ≤ 50 ≤ 1.0 - ≤ 250
Limit value 6.5 to 8.5 ≤ 40 ≤ 100 ≤ 150 ≤ 100 ≤ 100 ≤ 1.0 ≤ 50 ≤ 400
Main harm Corrosion
Scale
Corrosion
Scale
Scale Scale Corrosion Corrosion Scale Scale Scale
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