2. Operation and Maintenance
13
4. Check the state of the engine during operation using the
warning indicators and gauges installed in the machine.
Engine Oil Pressure
If the engine oil pressure is inconsistent while idling or the
engine oil pressure does not reach the specified amount
while driving at a high speed, stop the engine immediately,
check the oil level and check the oil lines for leakage.
Coolant Temperature
Operating the engine with an excessively low coolant
temperature increases fuel consumption and wear of the
cylinder liner, thereby shortening the engine life.
Engine Speed (rpm)
In electronically controlled engines, the engine control unit
(ECU) has a function which prevents the engine from running
at engine speeds (rpm) exceeding the specified amount in
order to protect the engine. A variety of functions—such as
controlling fuel flow, delaying ignition time, and blocking fuel
and ignition—are set by the memory in the engine control
unit (ECU) and cannot be changed arbitrarily by the operator.
Running the Engine in Winter
Prevention of Coolant Freezing
Using only water to add coolant without any antifreeze can
cause corrosion inside the engine, reduce cooling efficiency,
and cause engine freezing in winter. When operating the
engine in a cold area for an extended period of time, make
sure to completely drain coolant from the engine. Frozen
coolant can cause critical damage to the engine. When
adding and replacing coolant, make sure to use coolant
mixed with the specified ratio of antifreeze. Antifreeze
prevents coolant from freezing.
Preventing Engine Overcooling
If the engine is cooled below the normal operating
temperature, thermal efficiency drops and fuel consumption
and wear of the cylinder liner increase. Hence, make sure to
keep the engine running within the normal operating
temperature range. If the coolant temperature remains below
the normal operating temperature range in spite of running
the engine for a sufficient amount of time, check the
thermostat or other parts related to the cooling system.
Engine Oil
If the engine oil viscosity increases due to cold temperatures
in winter or in extremely cold regions, the engine rpm may be
unstable after starting the engine. In order to prevent this
phenomenon, make sure to replace the engine oil with
engine oil intended for use in winter or extreme cold. When
replacing engine oil, please use genuine oil recommended
by Hyundai Doosan Infracore.
Running the Primary Fuel Filter (Oil-Water
Separator) Heater
In winter and in cold temperatures, the paraffin in diesel
forms a gel and blocks the surface of the cartridge in the
primary fuel filter, resulting in restricted fuel flow. In such
cases, engine start-up may be delayed/impossible, the
engine rpm may be unstable after engine start-up, or the
engine may turn off. To prevent this phenomenon, run the
heater mounted on the primary fuel filter (oil-water separator)
five minutes before starting the engine to remove the paraffin
from inside the primary fuel filter and the paraffin gel entering
continuously from the fuel tank.
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