Chapter 4 Intake and Exhaust System
4. Turbocharger
4LHA Series
(8) Bearing housing (g)
1) Check the castings surface for separation, dents
and
cracks caused by oxidation degradation.
Replace
faulty parts
with
new ones.
2) Check the retaining ring (52) for breakage and
cracks.
Replace
with
a new one if defective.
3) Measure dimensions (B) and (F) of the bearing
housing
shown in the illustration. Replace if
either measured value
exceeds
the wear
limit.
Bearing
housing inside diameter (B)
Wear
limit:
16.11 mm
Seal
ring insertion hole on turbine side (F)
Wear
limit:
17.03 mm
(9)
Seal
plate <Q)
1) Check the seal plate for any contact traces and
defect, dent or cracks of the
joint
surfaces.
Replace
with
a new one if defective.
2) Measure the seal ring insertion hole (H) on the
compressor
side.
Replace
the seal ring
with
a new one if the
measured
value
exceeds
the wear
limit.
Wear
limit:
14.05 mm
(10) Seal rings ® and®
Replace
seal rings
with
new ones.
(11) Check bolts, etc. for
deformation.
Replace
with
new ones if defective.
Also,
replace the
M4
and M8
TORX
T screw bolt® and®
with
new ones.
(Measuring
dimensions ol bearing housing)
Wheel
chamber
B
rr
Turbine side
Compressor
side
Seal
plate
H
Measuring
dimensions
_
of seal plate
4-18
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