Washing And Inspection Procedure; Washing - Yanmar 3TNV Series Service Manual

8. Turbochager

8.5 Washing and Inspection procedure

8.5.1 Washing

(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
Carbon adhesion state
Lubrication status
(wear, seizure, discoloration, etc.)
Oil leak state
(2) Washing procedure
Keep the following in mind when washing the parts.
Part
a) Turbine s haft
b) Turbine wheel
chamber
c) Blower blade and
chamber
d) Others
1) Turbine shaft 1, turbine side seal ring and rear side of turbine
wheel
2) Heat insulating plate 20 mounting portion and inside of bearing
housing 15
1) Turbine shaft 1, journal portion and thrust bushing oil thrower 2
2) Floating bearing 5 and thrust bearing 6
3) Bearing housing 15 and inner wall of bearing fitting ring
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
Tools and detergent
Tools
1) Bucket(500 500)
2) Heat source:
Steam or gas burner
3) Brush
Detergent
Standard carbon
removing agent
Tools
Same as for turbine shaft
Detergent
Same as for turbine shaft
Tools
1)Bucket(500 500)
2)Brush
Detergent
1) Wash all other parts with diesel oil.
2) Clean the lubricating oil path by blowing with compressed air.
3) Be especially careful so as not to damage or corrode the parts.
Checking position
Procedure
1) Boil the turbine in the washing bucket.
Do not strike the blade to remove the carbon.
2) Immerse in the detergent until the carbon and other
deposits are softened.
3) Use a plastic scraper or hand hair scrubber to
remove the softened deposits.
4) Protect the bearing surface and seal ring groove on
the turbine shaft so as not to be damaged.
5) Any deposit remaining on the turbine shaft due to
improper washing may cause unbalancing. Be sure
to remove thoroughly. Never use a wire brush.
1) Boil the turbine in the washing bucket.
2) Immerse in the detergent until the carbon and other
deposits are softened.
3) Use a plastic scraper or hard hair scrubber to
remove the softened deposits.
1) Immerse in the washing bucket until the deposit is
softened.
2) Use a plastic scraper or hard hair scrubber to
remove the softened deposits.
Never use a wire brush.
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