10.4.4. Precautions for operation
1) Precautions for operation of engine
The following precautions should be observed when starting, operating, or stopping the
engine:
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Operations
Precautions
Reasons
When starting
the engine
1) Check oil level
2) Crank the engine with starter to
check the increase in oil pressure
(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.
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
Immediately
after starting
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.
1) Applying load abruptly If load is
abruptly applied with the engine
a n d t u r b o c h a r g e r r o t a t i n g
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.
During operation
Check the followings:
1) Oil pressure At idle: 0.8 kg/cm
2
or
more At full load: 3.0 ~ 4.8 kg/cm
2
2) If unusual sound or vibration is
heard or felt, reduce engine revolu-
tions slowly and locate the cause.
1) Excessively low oil pressure caus-
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.
When stopping
the engine
1) Run the engine at idle for 5 min-
utes before stopping.
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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