Daewoo D1146, Maintenance Manual

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D1146/D1146TI/DE08TIS
MAINTENANCE MANUAL
127
Printed in Jan. 2001 PS-MMA0415-E1A
4.4.5. Walk-around check and servicing
As the condition of turbocharger depends greatly on how well the engine is serviced, it
is very important to maintain the engine in accordance with the specified maintenance
procedure.
1) Intake system
Pay particular attention to the air cleaner when servicing the intake system.
In the case of wet-type air cleaner, if the level of oil surface is lower than specified,
cleaning effect is poor; if too high, the cleaner draws in oil to foul the case.
Especially, if the rotor is fouled, the sophisticatedly-tuned balance is broken to
create vibration and to cause seizure and unusual wear to the bearing.
Therefore, it is very important to use a good quality air cleaner all the time.
In the case of dry-type air cleaner, it is essential to clean it to reduce intake
resistance as much as possible.
2) Exhaust system
Pay particular attention to prevent gas leaks and seizure when servicing the exhaust
system because leakage of exhaust gas from discharge pipes, turbocharger fixing
portions, etc. lowers charging effect.
As such components as turbine chamber that becomes red-hot during operation use
heat resisting steel nuts, do not interchange these nuts with ordinary steel nuts. In
addition, apply anti-seizure coating to fixing nuts on the portions as designated.
3) Fuel system
If the full load stopper regulating the maximum injection volume and the maximum
speed stopper regulating the maximum speed in the fuel injection pump are
adjusted without using a pump tester, the turbocharger rotates at excessively rapid
speed and may suffer damage.
Besides of it, if spray pattern from the fuel injection nozzles is bad or the injection
timing is incorrect, temperature of exhaust gas rises up to affect the turbocharger
adversely. To avoid such trouble, be sure to make a nozzle test.
4) Lubricating system
Pay particular attention to oil quality and oil filter change intervals when servicing
the lubricating system. Deteriorated engine oil affects adversely not only the engine
but torso the turbocharger. Suggested engine oils for the turbocharger-mounted
engine are as follows: