DV11
Operation and Maintenance
170
Commissioning and Operation
Printed in Mar. 2005 PS-MMA0608-E1A
4.4.3. Prevention against excessive cooling
z 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 (78 ~ 85°C) after
continuous operation, examine the thermostat or the other cooling lines.
4.4.4. 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. Engine components check after long time running
z 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.
z 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. Thorough procedure of
analysis and correction, it is desirable to change or correct of all items affecting
power and performance.
z In case that the engine is perform in advance the prevention against trouble,
the engine can be run safely during a long time as that time , there can be used
more reliably.
z Economical, trouble-free operation can better be ensured if a complete tune-up is
performed once every years, preferably in the spring.
z Below components that affect power and performance to be checked are:.
- Components affecting intake & exhaust
Air cleaner, inter-cooler, turbo charger, silencer, etc
- Components affecting lubrication & cooling
Air & oil filter, anti- freeze, etc
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