Charging The Coolant; Cleaning The Cooling Circuit - Doosan DP158LCF Operation & Maintenance Manual

Charging the Coolant

1. Make sure that engine is coolant.
2. Open the radiator cap.
DANGER
• Never open the radiator cap while the engine is
overheated. If the radiator cap is opened while
the engine is overheated, hot water will spurt out
and may cause serious burns. Open the radiator
cap after ensuring that the engine has been
cooled sufficiently.
• Mark and separately manage the containers for
storing coolant from beverage containers to avoid
confusion. If coolant is ingested, see a doctor
immediately.
3. Put in the coolant slowly.
CAUTION
Be careful not to let foreign substances flow into the
engine when replenishing coolant.
4. Be sure that the air is gone out from cooling system.
5. After checking the coolant level when the engine is
warmed up, replenish coolant if necessary.
DANGER
If the engine is hot, wrap the coolant pressure cap
with a cloth upon opening it so that the steam may
be discharged. This can prevent you from burning
by the hot steam coming out of the cap inlet.
CAUTION
• Do not mix antifreezes from different manufac-
turers.
• Do not mix the coolant with different concentra-
tions.
• Do not add antirust which is not recommended
by us.
• As insufficient coolant concentration may cause
corrosion or freezing, on the other hand, an
excessive concentration may degrade the cooling
performance. Mix coolant with 40% antifreeze and
3~5% additives (DCA4) to prevent corrosion.
4. Regular inspection
Discard exchanged coolant according to the regula-
tions set forth by the relevant authorities. Disposing
of exchanged coolant into the ground, sewers,
drains, rivers, or the sea will cause serious environ-
mental pollution. Violation of regulations regarding
discard of coolant without observing the handling
regulations, will be punished.

Cleaning the cooling circuit

If the internal coolant circuit is contaminated by corrosion
or foreign substance, the cooling effect is reduced. The
resistance in the coolant circuit may damage the mechan-
ical seal of the coolant pump.
The negative impact on the cooling circuit may be caused
by use of improper antifreeze or corrosion inhibitor, or by
use of coolant without such ingredients. If the coolant
pump leaks or the coolant is severely contaminated within
short period of time (6 months) after start of using the
operation (e.g., the coolant color becomes muddy - prob-
ably brown, gray or black depending on the degree of
contamination), before removing the coolant pump, clean
the cooling system in the following way.
1. Discharge the coolant.
2. If you want to clean the cooling circuit swiftly, remove
the thermostat.
3. Mix water and 1.5% of cleaning solution and fill the
cooling circuit with this liquid.
4. Load the engine. When the coolant temperature
reaches 60°C, run the engine for about 15 minutes.
5. Discharge the cleansing solution.
6. Repeat the step 3 and 4 above.
7. Fill the cooling circuit with hot water.
8. While running the engine at idle speed for 30 minutes,
check if there is any leakage in the drain plug and
coolant line. If the coolant is insufficient, replenish it.
Clean the cooling circuit regularly with cleansing
solution.
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WARNING
CAUTION