Illustration 11
g00763164
Typical example
(1) Turbine Housing
(2) Turbine Wheel
(3) Turbocharger
1.
Inspect the turbine for damage by a foreign object.
If there is damage, determine the source of the
foreign object. Replace turbocharger (3). If there is
no damage, go to Step 2.
2.
Inspect turbine wheel (2) for buildup of carbon and
other foreign material. Inspect turbine housing (1)
for buildup of carbon and foreign material. Clean
turbine wheel (2) and clean turbine housing (1) if
you find buildup of carbon or foreign material. If
there is no buildup of carbon or foreign material,
go to Step 3.
3.
Turn the rotating assembly by hand. While you turn
the assembly, push the assembly sideways. The
assembly should turn freely. Turbine wheel (2)
should not rub turbine wheel housing (1). Replace
turbocharger (3) if turbine wheel (2) rubs turbine
housing (1). If there is no rubbing or scraping, go
to Step 4.
4.
Inspect the turbine and turbine housing (1) for oil
leakage. Inspect the turbine and turbine housing
(1) for oil coking. Some oil coking may be cleaned.
Heavy oil coking may require replacement of the
turbocharger. If the oil is coming from the
turbocharger center housing go to Step 4.a.
a.
Remove the oil drain line for the turbocharger.
Inspect the drain opening. Inspect the area
between the bearings of the rotating assembly
shaft. Look for oil sludge. Inspect the oil drain
hole for oil sludge. Inspect the oil drain line for
oil sludge. If necessary, clean the rotating
assembly shaft. If necessary, clean the drain
opening. If necessary, clean the drain line.
b.
If crankcase pressure is high, or if the oil drain
is restricted, pressure in the center housing
may be greater than the pressure of turbine
housing (1). Oil flow may be forced in the
wrong direction and the oil may not drain.
Check the crankcase pressure and correct
any problems.
c.
If the oil drain line is damaged, replace the oil
drain line.
d.
Check the routing of the oil drain line.
Eliminate any sharp restrictive bends. Make
sure that the oil drain line is not too close to
the engine exhaust manifold.
e.
If Steps 4.a through 4.d did not reveal the
source of the oil leakage, turbocharger (3) has
internal damage. Replace turbocharger (3).
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