Doosan GV158TIC, Operation & Maintenance Manual

Page: 135 / 162

Maintenance of major parts - 129 -
5.1.7. Routine inspection and maintenance
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Since the state of turbocharger depends largely on the state of engine maintenance, to perform the
specified keep up thoroughly is needed.
1) Air intake system
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System in the intake air system, care must be taken to the air cleaner. In case of oil passing
type air cleaner, if the oil level is lower than the specified value, the cleaning efficiency get
worse, if higher, the sucked oil pollutes a case.
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Particularly, for if the rotor were polluted, the balance adjusted precisely would be deviated to
cause a vibration that may cause the stuck or abnormal wear by loading large force to the
bearing, the perfect air cleaner must always be used.
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In case of dry type filter, according to the indication of a dust indicator, cleaning must be done
to make the intake air resistance as small as possible.
2) Exhaust system
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In exhaust system, a care must be taken to the gas leak and the stuck prevention. If exhaust
gas leaks from the exhaust pipe and turbocharger etc., for the super charging effect will be
lowered, the installed states of various parts must be paid with careful attention.
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Since the parts that reach to high temperature during operation such as the turbine room use
the anti-heat nuts, a care must be paid not to mix with the general nuts and at the same time,
bolt stuck preventing paint should be coated on the nut for the designated places.
3) Lubricating system
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In the lubricating system, a care must be paid to the oil quality and oil element replacement
cycle.
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For the oil deterioration of turbocharger equipped engine, needless to speak of engine assem-
bly itself, influences badly to the turbocharger too, the specified engine oil should used.
Operation Caution Reason
At stop 1) At stopping the engine, perform the idling
operation for 5 min. and then stop it.
1) After heavy load operation, if the engine
were stopped suddenly, the heat would
be conducted to bearing parts from red
hot turbine wings that would result in
burning the oil to cause the stuck bear-
ing metal and revolving shaft.