Walk-Around Check And Servicing; Intake System; Exhaust System; Fuel System - Doosan DE08TIS Series Operation & Maintenance Manual

4. MAINTENANCE OF MAJOR COMPONENTS

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:
Engine model
DE08TIS
Recommend oil
SAE No.
SAE 10W40
112
API No.
API CI-4