TM 5-3805-281-24-2
Fuels, Lubricants, and Coolant
They often contain a high
IMPORTANT: Never use automotive-type coolants
concentration of silicates and may
(such as those meeting ASTM D3306
damage the engine or cooling
or ASTM D4656). These coolants do
system.
not contain the correct additives to
protect heavy-duty diesel engines.
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1928OCT992/4
SUPPLEMENTAL COOLANT ADDITIVES (SCAS)
IMPORTANT: DO NOT over-inhibit antifreeze
solutions, as this can cause
silicate-dropout. When this happens, a
gel-type deposit is created which
retards heat transfer and coolant flow
causing engine to overheat.
NOTE: John Deere Prediluted Antifreeze/Summer
Coolant, John Deere Antifreeze/Summer Coolant
Concentrate or equivalent supplemental coolant
additives are recommended. As the coolant
solution loses its effectiveness, additives will need
to be added.
Operating without proper coolant additive will result in
increased corrosion, cylinder liner erosion and pitting, and
other damage to the engine and cooling system. A simple
mixture of ethylene glycol and water WILL NOT give
adequate protection.
The use of supplemental coolant additives reduces
corrosion, erosion, and pitting. These chemicals reduce
the number of vapor bubbles in the coolant and help form
a protective film on cylinder liner surfaces. This film acts
as a barrier against the harmful effects of collapsing vapor
bubbles.
Inhibit the antifreeze-coolant mix with a non-chromate
inhibitor. John Deere Liquid Coolant Conditioner is
recommended as a supplemental coolant additive in John
Deere engines.
Continued on next page
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