Never use both the liquid cooling system conditioners and coolant conditioner elements at the
Do not use cooling system conditioner or coolant conditioner elements with Dowtherm 209 Full-
Add cooling system conditioner to achieve a 3 percent concentration or insert the proper precharge element.
Bring the coolant level to within 1/2 Inch (1 cm) of the bottom of the fill pipe.
When refilling cooling system, coolant level must be rechecked when engine reaches operating
Start engine with coolant cap off Add coolant, f necessary, when engine reaches operating temperature and
coolant level stabilizes.
Stop engine Replace cap seal if damaged Install cap.
4-7.3.7 Diesel engine coolant (anti-freeze) change Change diesel engine cooling system anti-freeze every 2000
hours of operation.
At operating temperature, 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.
Loosen filler cap slowly to relieve pressure and remove cap.
Remove engine block drain plugs and allow coolant to drain (Figure 4-8).
Clean drain plugs and reinstall.
Fill engine cooling system (paragraph 4-7.3.6).
4-7.3.8 Diesel engine cooling system cleaning. Most commercial cooling system cleaners may be used In the
Drain cooling system (paragraph 4-7.3.7).
Install drain plugs Fill system with cleaning solution [2 lbs. Sodium Bisulfate (NaHSO4) per 10 U S gallons (1
kilogram per 40 liters) of water].
Start and run engine for 1/2 hour. Stop engine and drain cleaning solution.
Flush system with fresh water until water Is dean Do not run engine while flushing.
Install drain plugs Fill system with neutralizing solution [1/2 lb Sodium Carbonate Crystals (Na2CO3) per 10U
S gallons (250 grams per 40 liters) of water].
Start and run engine for 10 minutes Stop engine and drain neutralizing solution.
Flush system with fresh water until water is dean Do not run engine while flushing.
Install all drain plugs.
Fill cooling system (paragraph 4-7.3. 6).