DE08TS Diesel Engines Maintenance of Major Components
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 ser-
vicing 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 resist-
ing 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 sys-
tem. Deteriorated engine oil affects adversely not
only the engine but torso the turbocharger.
Suggested engine oils for the turbocharger-mount-
ed engine are as follows :
92
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