General Coolant Information
Water
Distilled or deionized water is recommended for use in
cooling systems. Do not use hard water, tap water, or
salt softened tap water in engine cooling systems. If
distilled or deionized water is not available, use the
cleanest water available and have the cooling system
cleaned and the coolant replaced.
NOTICE
Water that does not meet the minimum acceptable
limits will reduce engine service life when used in
cooling systems.
Additives
Additives must be included in all coolant mixtures.
Additives help prevent the formation of rust, scale, and
mineral deposits. Additives protect metals from
corrosion, prevent liner cavitation, and contain anti-
foaming agents.
NOTICE
MIL-A-53009 Supplemental Coolant Additive (SCA) is
not acceptable for use in the engine on this machine.
Glycol
Engine coolant glycol is normally either ethylene or
propylene. Glycol raises the boiling point of water to
help prevent boil-over, provides freeze protection,
helps prevent water-pump cavitation, and reduces
cylinder liner pitting.
NOTICE
For ambient temperatures requiring lower freeze
protection (higher than 50 percent glycol), use
ethylene glycol. do not use propylene glycol.
Proper freeze and boil protection requires the proper
ratio of glycol and acceptable water. Use the following
charts to determine glycol concentrations to mix with
acceptable water.
Cooling System Specifications
99
Maintenance Section
Cooling System Specifications
TM5-2430-200-10
Percentage of
Propylene Glycol
30%
40%
50%
Anti-Boil
Protection
102°C (216°F)
104°C (219°F)
106°C (223°F)
Freeze
Protection
-15°C (-5°F)
-23°C (-9°F)
-37°C (-35°F)
Percentage of
Ethylene Glycol
30%
40%
50%
60%
Antiboil
Protection
104°C (219°F)
106°C (223°F)
108°C (226°F)
111°C (232°F)
Freeze
Protection
-15°C (-5°F)
-24°C (-11°F)
-37°C (-35°F)
-57°C (-71°F)
