Chapter 4 Intake and Exhaust System
4. Turbocharger
4LHA Series
4-6-2
Inspection
procedure
(1) Compressor housing®
Check
the compressor housing for any contact traces
with
the compressor impeller and defect, dent or
cracks
at
joint
surfaces,
and replace if it is defective.
(2)
Turbine
housing©
Check
for any contact traces
with
the turbine wheel,
separation due to degradation by oxidation of the
case
surface,
thermal deformation or cracks. Replace
with
a new one if defective.
(3) Compressor impeller ®
Check
for any contact traces, chipping, corrosion or
deformation.
Replace
with
a new one if defective.
(4) Turbine shaft ®
1) Check for any contact traces, chipping, thermal
discoloration or deformation at the turbine wheel.
Check
the shaft portion for bend, the journal
portion for thermal discoloration or abnormal
wear, and the seal ring groove for surface defect
or wear.
Replace
with
a new one if defective.
2) Measure the outside diameter (A) and seal ring
groove width (E) of the turbine shaft journal.
Replace
with
a new turbine shaft if beyond the
wear
limit.
Wear
limit
of journal outside diameter (A):
11.38 mm
Wear
limit
of seal ring groove width (E):
1.33 mm
3) Measure runout of the turbine shaft. Replace
with
a new one if measured runout exceeds
0.011 mm.
(5)
Thermal
insulation
plate©
Check
the thermal insulation plate for any contact
traces,
thermal deformation or corrosion. Replace
with
a new one if defective.
4-16
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