Operation In Winter Time; Prevention Against The Freeze Of Cooling Water; Prevention Against Excessive Cooling; Tuning The Engine - Daewoo DE12T Manual

4.4. Operation in Winter Time

Pay special attention to the freezing of cooling water and the viscosity of lubricating oil.

4.4.1. Prevention against the freeze of cooling water

When not using anti-freeze, completely discharge the whole cooling water after engine running.
The freeze of cooling water causes the fatal damages of the engine. Because the anti-freeze is
used to prevent cooling water from freeze, consult "The amount of anti-freeze".

4.4.2. Prevention against excessive cooling

Drop of thermal efficiency caused by excessive cooling increases fuel consumption, therefore
prevent the engine from excessive cooling. If the temperature of coolant does not reach to
normal condition (79 ~ 95 °C ) after continuous operation, examine the thermostat or the other
cooling lines.
4.4.3. Lubricating oil
As cold weather leads to the rise of oil viscosity, engine speed becomes unstable after starting.
Therefore the lubricating oil for winter should be used to prevent this unstability. Refer to
Lubricating System section.

4.5. Tuning the Engine

The purpose of an engine tune-up is to restore power and performance that's been lost through
wear, corrosion or deterioration of one or more parts or components. In the normal operation of
an engine, these changes can take place gradually at a number of points, so that it's seldom
advisable to attempt an improvement in performance by correction of one or two items only.
Time will be saved and more lasting results will be obtained by following a definite and thorough
procedure of analysis and correction of all items affecting power and performance.
Economical, trouble-free operation can better be ensured if a complete tune-up is performed
once every years, preferably in the spring. Components that affect power and performance to be
checked are:
•
Components affecting fuel injection ;
Nozzle, delivery valve, fuel filter, water separator, etc.
•
Components affecting Intake & exhaust ;
Air cleaner, inter-cooler, turbo charger, silencer, etc.
•
Components affecting lubrication & cooling ;
Air & oil filter, anti- freeze, etc.
COMMISIONING AND OPERATION
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