Washing And Inspection Procedure; Washing - Komatsu 4D98 Series Shop Manual

8. Turbocharger (for 4TNE 106T)
(3.6)
Slide bearing and thrust bushing removal
@ Use the Torx driver and loosen the M3 Torx T-type machine screw for thrust bearing
installation.
@ Use the bar (copper) and remove thrust bearing 6 and thrust bushing.
(3.7) Floating bearing removal
0 Use the stop ring pliers and remove circlip 16 from bearing housing 15.
@ Remove floating bearing 5 from bearing housing 15.
(3-8) Seal ring removal
@ Remove turbine side seal ring 3 from turbine shaft 1.
@ Remove compressor side seal ring (small) and compressor side seal ring (large) from oil
thrower 2.
8.5
Washing and Inspection procedure
(1) Washing
(1.1) Inspection before washing
Visually inspect each part before washing to check trace of seizure, wear, foreign matter or
carbon adhesion.
Carefully inspect for identifying the cause of trouble especially when a fault has occurred.
<Major inspection items>
Check point Checking position
Carbon adhesion
1) Turbine shaft 1, turbine side seal ring and rear side of turbine wheel
state 2) Heat insulating plate 20 mounting portion and inside of bearing housing 15
Lubrication status 1) Turbine shaft 1, journal portion and thrust bushing oil thrower 2
(wear, seizure, 2) Floating bearing 5 and thrust bearing 6
discoloration, etc.) 3) Bearing housing 15 and inner wall of bearing fitting ring
Oil leak state 1) Inner wall of turbine housing 11
2) Outer surface of bearing housing 11 and heat insulating plate 20 mounting portion
3) Turbine shaft 1 turbine side seal ring portion and rear side of turbine wheel
4) Inner wall of compressor housing 7
5) rear side of compressor impeller 18
6) Surface and seal ring inserting portion of seal plate 4
8-10