Doosan AD158TI, Руководство по эксплуатации и техническому обслуживанию

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Main parts maintenance - 142 -
7.4.3. Inspection
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 and pay particular attention to
checking oil & air leaks, unusual sound on running.
1) Checking of the rotor for rotating condition
The inspection of the rotor assembly for rotating condition should be performed by the degree of unusual
sound on running. If a sound detecting bar is used, install its tip on the turbocharger housing and increase
the engine revolutions slowly. If a high-pitch sound is heard every 2 ~ 3 seconds or continuously, it means
that the rotor assembly is not normal. In this case, as the metal bearing and rotor are likely to be in abnor-
mal conditions, the turbocharger should be replaced or repaired.
2) Checking of the rotor end play
The radial and axial clearances of the rotor should check after every 2,000 hours operation. This precau-
tion will enable measuring for any wear of axial clearance bearings to be detected in good time before
serious damage is caused to the rotor and bearings. Disassemble the turbocharger from the engine, then
check the rotor axial play and radial play.
(1)
When disassembling the turbocharger, be sure to plug the oil inlet and outlet ports
(2) If the measured axial and radial plays are beyond the limit of wear, replace or repair the turbocharger.
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Measuring rotor axial clearance
●
Measuring radial clearance
EA7O5011
Magnetic vise
Dial gauge
Turbine wheel chamber
Move the turbine
shaft to axial
direction
Wear limit : 0.12mm
Axial clearance 0.12 mm
Radial clearance 0.58 mm
EA7O5012
Dial gauge
Magnetic vise
Oil inlet
Move the turbine shaft
in both directions
simultaneously
Radial play
Limit of wear : 0.58mm