Precautions For Operation; Precautions For Operation Of Engine; When Starting The Engine; During Operation - Daewoo DE12T Manual

6.4.4. Precautions for operation

1) Precautions for operation of engine

The following precautions should be observed when starting, operating, or stopping the
engine :
Operations
When starting
the engine
Immediately
after starting

During operation

When stopping
the engine
MAINTENANCE OF MAJOR COMPONENTS
Precautions
1) Check oil level
2) Crank the engine with starter to
check the increase in oil pres-
sure(until the needle of pressure
gauge starts to move or pressure
indicator lamp is actuated) before
starting the engine.
3) When having replaced oil, oil filter
element, or lubricating parts, or
when having stopped the engine
for extended period of time, or in a
cold place, loosen the oil pipe con-
nections and operate the starter
motor until oil is discharged. After
completing the operation, be sure
to retighten the oil pipe connections
portion before starting the engine.
1) Run the engine at idle for 5 min-
utes after starting off.
2) Check each part for leakage of oil,
gas, and air, and take proper mea-
sure.
Check the followings:
1) Oil pressure At idle: 0.8 kg/cm
more At full load: 3.0 ~ 4.8 kg/cm
2) If unusual sound or vibration is
heard or felt, reduce engine revolu-
tions slowly and locate the cause.
1) Run the engine at idle for 5 min-
utes before stopping.
2) Abrupt starting of the engine caus-
es the engine to rotate with oil not
being distributed not only to each
part but also to the turbocharger,
resulting in abnormal wear or
seizure on the bearing due to
insufficient supply of oil.
3) In the case of the engine stopped
for extended time or in a cold
place, oil fluidity within the pipes
can be deteriorated
1) Applying load abruptly If load is
abruptly applied with the engine
and
unsmoothly, such parts that a suffi-
cient amount of oil has not reached
can be seized up.
2) Leakage of oil, gas, and air (espe-
cially, oil leak) causes drop in oil
pressure and loss of oil results in
seizure of the bearing.
or 1) Excessively low oil pressure caus-
2
2 es unusual wear or seizure of the
bearing. Too high pressure causes
oil leakage.
2) The engine is operated continuously
with unusual sound or vibration not
corrected, it can be damaged
beyond repair.
1) If the engine is put to a stop after
being operated at high load, heat
from the red-hot turbine blades is
transmitted to the bearing portion
and burns oil to cause seizure of the
bearing metal and rotating shaft.
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Reasons
turbocharger rotating