TM 55-1930-209-14&P-3
4-7.3.5 Diesel engine cooling system 500 hour service. All water Is corrosive at engine operating temperatures
Cooling system conditioner liquid or coolant conditioner element treats either plain water or ethylene glycol anti-freeze
solution to minimize corrosion If cooling system uses conditioner liquid Instead of a coolant conditioner element, perform
the following service every 500 hours of operation.
WARNING
At operating temperatures, engine coolant Is hot and under pressure. It also contains alkaline
materials harmful to eyes and skin. To avoid personal Injury, check coolant level only when
engine is stopped and filler cap is cool enough to be touched with a bare hand. Should engine
coolant come in contact with eyes or skin, Immediately flush affected area with clean water and
seek medical assistance if necessary.
CAUTION
Never use both the liquid cooling system conditioner and coolant conditioner element at the
same time.
Do not use cooling system conditioner or coolant conditioner elements with Dowtherm 209 Full-
Fill coolant.
a.
Loosen filler cap slowly to relieve pressure and remove cap.
NOTE.
To allow for the addition of conditioner, some coolant may have to be drained.
b
Add cooling system conditioner to achieve a 3 percent concentration.
c.
Inspect filler cap gasket and replace if necessary.
d.
Install filler cap.
4-7.3.6 Diesel engine cooling system replenishment.
CAUTION
Never add coolant to an overheated engine. Allow engine to cool first.
a.
Mix anti-freeze to provide protection to the lowest expected ambient temperature.
NOTE.
When filling cooling system, allow for addition of conditioner.
b.
To avoid air pockets, add coolant slowly, at 5 U.S gallons (19 liters) per minute or less. Cooling system
holds 9 U S gallons.
.
WARNING
Cooling system conditioner contains alkali. Avoid contact with skin and eyes.
.
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