G80XW/XF, G115XW/XF, G150XW/XF, G200XW/XF - 50HZ
OPERATION & MAINTENANCE MANUAL
73
G100XW/XF, G135 XW/XF, G170XW/XF, G225XW/XF - 60Hz
USE OF GENUINE PARTS
An engine consists of many parts which are mechanically
harmonized. To prevent engine faults in advance and use
engines with best performance for a long period,
maintenance and replacement of expendable parts
should be conducted regularly.
Use of genuine parts is recommended. Using
unauthorized or remanufactured parts may cause critical
damage and faults to engine for which Doosan shall not
be held liable.
COOLING SYSTEM
GENERAL INFORMATION
The coolant should be replaced according to the cycle
specified in the inspection interval table. If the coolant
gets dirty, the engine is overheated, and the coolant
overflows in the thermal expansion tank.
COOLANT STANDARDS
It is recommended that the antifreeze is added in a
concentration of approximately 40~50% of the entire
coolant. The antifreeze prevents the freezing and
corrosion of the system, and increases the boiling point
of coolant. In winter, the amount of antifreeze may need
to be changed to suit the ambient temperature as shown
in the table below. The freezing point per antifreeze ratio
shown in the table may differ slightly depending on the
antifreeze type. For more information, see the
specifications provided by the manufacturer. Whenever
coolant (water) is added to replenish the amount reduced
by engine operation, the antifreeze portion is decreased.
Therefore, the antifreeze level must be increased to the
proper level after replenishing the coolant.
•
concentration of antifreeze during winter
CAPACITY OF COOLANT
CHECKING THE COOLANT
DANGER
If the radiator cap is opened to exchange or replenish
coolant while the engine is overheated, hot water will
spurt out and may cause serious burns. If it is
absolutely necessary to open the radiator cap while
the engine is overheated, wrap the radiator cap with
a cloth and slowly open the cap in two steps until the
steam pressure has been released from the inside.
After the steam pressure has been completely
released, remove the radiator cap.
1. Use clean tap water for the engine coolant.
2. Add 40% of antifreeze to the coolant to prevent
corrosion and freezing.
3. Periodically check coolant to maintain the
concentration of antifreeze and additives.
CAUTION
If the antifreeze and corrosion inhibitor is kept at the
proper level, corrosion of the engine will be
prevented effectively and engine quality will be
maintained. Be careful that, if managed improperly, it
can give a fatal impact on the coolant pump and
cylinder liner.
4. Check the concentration of antifreeze and corrosion
inhibitor using the coolant test sheet.
MEASUREMENT OF COOLANT CONCENTRATION
•
Special Tools
The coolant concentration can be measured as follows:
Ambient
temperature
(°C)
Coolant (°C)
Antifreeze (%)
Antifreeze (%)
85
15
-10
80
20
-15
73
27
-20
67
33
-25
60
40
-30
56
44
-40
50
50
Engine Mode
Coolant capacity (litres)
D1146
14/11
D1146T
DP086TA
P086TI
Figure
Product Number/Name
60.99901-0038
COOLANT TEST SHEET
test sheet
