Yanmar 4LHA-HTP Operation Manual page 495

Chapter 4 Intake and Exhaust System
4. Turbocharger
(8) B e a r i n g h o u s i n g (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.
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) S e a l 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 ® a n d ®
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)
Replace if
Seal plate
Measuring dimensions
_ of seal plate
4-18
Wheel chamber
rr
B
Compressor side
Turbine side
H
4LHA Series