Yanmar 4LHA-HTP Operation Manual page 493

Chapter 4 Intake and Exhaust System
4. Turbocharger
4 - 6 - 2 Inspection procedure
(1) Compressor h o u s i n g ®
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.
with a new one if defective.
(3) C o m p r e s s o r 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 p l a t e ©
Check the thermal insulation plate for any contact
traces, thermal deformation or corrosion. Replace
with a new one if defective.
Replace
4-16
4 L H A S e r i e s