50 Hz: G625 - G690 - G750XW/XF
OPERATION & MAINTENANCE MANUAL
42
60 Hz: G655 - G750 - G800 - G850XW/XF
3.
Pour in the coolant slowly.
CAUTION
Be careful not to let foreign substances flow into the
engine when replenishing coolant.
4.
Ensure that there is no air in the 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 burning by the hot
steam coming out of the cap inlet.
CAUTION
Do not mix antifreezes from different manufacturers.
Do not mix the coolant with different concentrations.
Do not add antirust which is not recommended by
us.
As insufficient coolant concentration may cause
corrosion or freezing, alternatively, an excessive
concentration may degrade the cooling performance.
Mix coolant with 40% antifreeze and 3~5% additives
(DCA4) to prevent corrosion.
WARNING
Discard exchanged coolant according to the
regulations set forth by the relevant authorities.
Disposing of exchanged coolant into the ground,
sewers, drains, rivers, or the sea will cause serious
environmental 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 substances, the cooling effect is reduced. The
resistance in the coolant circuit may damage the
mechanical seal of the coolant pump.
The reduced performance in the cooling circuit may be
caused by use of incorrect type or quantity of antifreeze
or corrosion inhibitor, or by use of coolant without such
ingredients. If the coolant pump leaks or the coolant is
severely contaminated within the first 6 months of
operation (e.g., the coolant colour becomes discoloured-
brown, grey or black depending on the degree of
contamination), clean the cooling system in the following
way before removing the cooling pump.
1.
Drain the coolant.
2.
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 approximately 15
minutes.
5.
Drain the cleansing solution.
6.
Repeat 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.
CAUTION
Clean the cooling circuit regularly with cleansing
solution.
