Inspection Procedure - Yanmar 3TNV Series Service Manual

8.5.2 Inspection procedure

(1) Compressor housing 7
Inspect the compressor housing for any contact trace
with the compressor impeller, surface defect, dent or
crack at joint surface, and replace it if defective.
(2) Turbine housing 11
Inspect any trace of contact with the turbine wheel,
exfoliation due to degradation by oxidation of the cast
surface, thermal deformation or crack.
Replace with a new one of defective.
(3) Compressor impeller 18
Inspect any contact trace, chipping, corrosion or
deformation.
Replace with a new one if defective.
(4) Turbine shaft 1
1) Inspect any contact trace, 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 turbine shaft journal outside
diameter (A) and seal ring groove width (E).
Replace with a new turbine shaft if beyond the
wear limit.
Wear limit of journal outside diameter (A)
RHF5 7.98mm
RHB51 7.98mm
RHB31 6.25mm
Wear limit of ring groove width (E)
RHF5 1.29mm
RHB51 1.29mm
RHB31 1.07mm
3) Measure the turbine shaft run-out, and replace
with a new turbine shaft if it exceeds 0.011 mm.
(5) Heat insulating plate 20
Inspect the heat insulating plate for any contact trace,
thermal deformation or corrosion Replace with a new
one if defective.
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8. Turbochager