Deutz WP6C/WP4C Series Marine Diesel Engine Use and Maintenance Manual
5
Table 2-2 Coolant composition
Water quality
min max
PH
6.5
8.5
Only if the coolant meets the water-quality
composition, can it be mixed with the
antifreeze or anti-corrosion agent.
Chloride ion content mg/dm
3
-
100
Carbonate content mg/dm
3
-
100
Total negative ion content mg/dm
3
-
150
Total
hardness
when using
the
long-lasting antifreeze, mg/dm
3
3
12
Carbonate hardness mg/dm
3
3
-
Total
hardness
when using
the
anti-corrosive agent (take note of the
instruction of supplier) mg
/
dm
3
0
10
Note: Because inner galvanized tube is not suitable to use anti-corrosive agent, this tube is not
used as the coolant pipe.