Heavy Duty Coolant
Water
Waterquality is important forcooling system performance.
Excessive levels of calcium and magnesium contribute to
scaling problems, and excessive levels of chlorides and
sulfates cause cooling system corrosion.
Antifreeze
Cummins/FleetguardT recommends using a low-silicate
antifreeze concentrate that meets ASTM D4985 specifi-
cations (less than .10% silicate, expressed as Na
2
SIO
3
).
Low-silicate antifreeze must be mixed with quality water
at a 50/50 ratio (40 to 60% working range). A 50/50 miture
of antifreeze and water gives a -34°F freeze point and a
boiling point of 228°F, which is adequate for locations in
North America. The actual lowest freeze point of ethylene
glycol antifreeze is at 68%. Using higher concentrations
of antifreeze will raise the freeze point of the solution and
increase the possibility of a silicate gel problem.
A refractometer must be used to accurately measure the
freeze point of the coolant.
Water Quality
Calcium
Magnesium
(Hardness)
170 PPM
as (CaCO
3
+MgCO
3
Chloride 40 PPM
as (C1)
Sulfur 100 PPM
as (SO
4
)
Heavy Duty Coolant Section 1 - Cooling System
N14Page 1-6
To Next Page
Loading...
