How To Maintain Turbocharger - Doosan DP158L Series Operation & Maintenance Manual

How to Maintain Turbocharger

1. Cautions for engine operation
1) Observe the followings when starting, operating, and
stopping an engine.
Item
Starting an engine
After starting an engine
During Operation
Stopping an Engine
Cautions
1) Check the oil amount
2) Therefore, start the engine with the starter motor
to check the rise of oil pressure (until the gradation
of the oil pressure gauge moves or the pressure
indicator lamp is turned on).
3) If you replace oil, oil filter cartridge, or lubrication
system parts or use an engine in cold areas, or the
engine has stopped for a long period, loosen the oil
pipe joint at the inlet of the turbocharger and run
the starter motor until oil flows out. After completing
the work, tighten the oil pipe joint again and start
the engine.
1) Operate the engine at idle for five minutes from
starting it.
2) Check if oil, gas, or air is leaked from each part.
If so, take proper action.
check the following.
1) Oil pressure
2
At idle: 1.5 ~ 3.0 kg/cm
Fully loaded: 3.0 ~ 5.5 kg/cm
2) When abnormal noise or vibration occurs, slowly
reduce the rotate count until the engine stops and
then figure out the causes.
1) Operate the engine at idle for five minutes before
stopping it.
9. Intake/exhaust system
2) Overhasty start of engine leads to engine
rotation without lubricating turbocharger
and other engine parts, causing abnormal
wear or burning of bearings.
3) When an engine has stopped or kept
cold for a long period, circulation of oil in the
pipe gets poor.
1) When the engine is suddenly loaded
while the engine and the turbocharger have
not been smoothly rotated after starting the
engine, parts with insufficient oil may be
burnt.
2) Leakage of oil, gas, or air (especially oil)
reduces oil pressure and loss of oil cause
burning of bearings.
1) Too low oil pressure causes abnormal
wearing or burning of bearings. Too high oil
pressure causes oil leakage.
2
2) Operating an engine with noise or vibra-
tion may cause irreversible damage of the
engine.
1) Sudden engine stop after operating the
engine under high load allows the heat from
the red-heated turbine blade to be delivered
to the bearing system. Then oil burns and
the bearing metal and rotation shaft are
burnt.
145
Reasons