Hino Motors J08E-VC, Руководство по ремонту

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TURBOCHARGER (J08E) EN08–11
9. Table 1-9. Troubleshooting Procedures Notes
•
Turn the rotating assembly by hand and feel for dragging or binding. Push the rotating assembly side-ways while rotating
to feel for wheel rub. If there is any indication of rubbing, perform the bearing clearance inspection procedure. If the rotat-
ing assembly rotates freely and there is no evidence of binding or rubbing, it can be assumed that the turbocharger is ser-
viceable.
A Refer to engine manufacturer's service manual for inspection requirements and replacement specifications.
B With engine stopped, check duct clamping devices for tightness.
C With engine running at idle speed, lightly spray duct connections with starting fluid. Leaks at connections will be indi-
cated by an increase in engine speed due to the starting fluid being drawn into the compressor and pumped into the
engine combustion chambers.
D With engine running at idle speed, check duct connections for leaks by applying lightweight oil or liquid soap to areas
of possible leakage and checking for bubbles. Exhaust gas leakage between the engine block and the turbocharger
inlet will also create a noise level change.
E With engine running at idle speed, check for unusual noise and vibration. If either condition is noted, shut down the
engine immediately to protect the turbocharger and engine from further damage. With the engine stopped, check the
turbocharger shaft wheel assembly for damage as outlined Note I, below.
F With engine running, a change in the noise level to a higher pitch can indicate air leakage between the air cleaner and
the engine or a gas leak between the engine block and the turbocharger inlet.
G Exhaust gas leakage may be indicated by hat discoloration in the area of the leak.
H With the engine running, noise level cycling from one level to another can indicate a plugged air cleaner, a restriction in
the air-cleaner to compressor duct, or a heavy build-up of dirt in the compressor housing or on the compressor wheel.
I Internal inspection of the center housing can be accomplished by removing the oil drain line and looking through the oil
drain opening. When a slugged or cocked condition exists, a heavy sludge build-up will be seen on the shaft between
the bearing journals and in the center housing from the oil drain opening back to the turbine end.
J Thorough cleaning of the air intake system is essential following compressor wheel damage due to foreign object
impact. In many cases, metal pieces from the wheel become imbedded in the air cleaner element. If the element is not
changed, these metal pieces can be drawn into the replacement turbocharger and cause it to fail in the same manner
as the original unit.
K With the air inlet and exhaust gas ducting removed from the turbocharger, examine both the compressor and turbine
wheels for blade damage. Examine the outer blade tip edges for evidence of rubbing on housing surfaces.