Yanmar 3TNV Series Service Manual page 148

(8) Bearing housing 15
1) Inspect the housing for cast surface exfoliation
due to oxidation and degradation, dent or crack.
2) Inspect circlip 16 for chipping or crack, and
replace with a new one if defective.
3) Measure the (B) and (F) portions of the bearing
housing shown in the figure below.
Replace with a new one if either wear limit is
exceeded.
Wear limit of bearing housing inside diameter
(B)
RHF5 12.42mm
RHB51 12.42mm
RHB31 10.01mm
Wear limit of turbine side seal ring inserting
portion (F)
RHF5 15.05mm
RHB51 15.05mm
RHB31 11.03mm
(9) Seal plate 4
1) Inspect the seal plate for any contact trace, joint
surface defect, dent or crack.
Replace it if defective.
2) Measure the seal ring inserting dimensions (H1
and H2) on the compressor side, and replace the
seal ring with a new one if either wear limit is
exceeded.
Wear limits
RHF5 H1: 12.45mm, H2: 10.05mm
RHB51 H1: 12.45mm, H2: 10.05mm
RHB31 H1: 10.04mm, H2: 8.01mm
(10) Seal rings
Replace seal rings with new ones.
(11) Inspect keep plates 10, 13 and bolts for
any deformation, and replace defective
parts with new ones. Also replace M3
Torx machine screws with new ones.
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8. Turbochager