100
TM5-2430-200-10
Maintenance Section
Cooling System Specifications
Coolant Recommendations
Preferred—Caterpillar Extended Life Coolant (ELC) or
a commercial ELC that meets the Caterpillar
specification (EC- 1).
Acceptable—A Caterpillar Diesel Engine
Antifreeze/Coolant (DEAC) or a commercial heavy-duty
coolant/antifreeze that meets ASTM D4985, ASTM
D5345, or MIL-A-46153 specifications.
Unacceptable—Any high silicate coolant that is
classified as meeting ASTM D3306.
NOTICE
Most
commercial
engine
coolant/antifreeze
is
formulated
for
gasoline
engine
applications
and
have
a
high
silicate
content.
High
silicates
are
conducive to cylinder liner cavitation and corrosion.
Caterpillar
does
not
recommend
high
silicate
coolant/antifreeze.
NOTICE
Never add coolant to an overheated engine; allow the
engine to cool first. Do not add coolant too quickly.
Filling the cooling system at over 19 L (5 U.S. gal) per
minute can create air pockets in the cooling system.
Engine damage can result.
Note: MIL-A-4615 Antifreeze can be mixed with the
Caterpillar ELC supplied in the DEUCE.
When filling or adding coolant to the system, premix
the coolant solution prior to pouring it into the cooling
system. Pure, undiluted glycol will freeze at —230C
(-00F). Use a coolant solution in a range which will
provide protection to the lowest expected outside
(ambient) temperature and provide the required boil-
over protection.
