Inspection Procedure - Komatsu 4D98 Series Shop Manual

8.
Turbocharger (for 4TNE106T)
(1.2)
Washing procedure
Keep the following in mind when washing the parts.
Part Tools and detergent
Procedure
(1)
1. Tools 1) Boil the turbine in the washing bucket.
Turbine 1) Bucket (500 x 500)
Do not strike the blade to remove the carbon.
shaft
2) Heat source: 2) Immerse in the detergent until the carbon and other
Steam or gas burner
deposits are softened.
3) Brush
3) Use a plastic scraper or hard hair scrubber to remove the
softened deposits.
2. Detergent 4) Protect the bearing surface and seal ring groove on the
Standard carbon removing
turbine shaft so as not to be damaged.
agent
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.
(2)
1. Tools
1) Boil the turbine in the washing bucket.
Turbine Same as for turbine shaft
2) Immerse in the detergent until the carbon and other deposit:
wheel
are softened.
:hamber 2. Detergent 3) Use a plastic scraper or hard hair scrubber to remove the
Same as for turbine shaft
softened deposits.
:3)
1. Tools 1) Immerse in the washing bucket until the deposit is softened.
310wer 1) Bucket (500 x 500) 2) Use a plastic scraper or hard hair scrubber to remove the
)lade 2) Brush softened deposits.
ind Never use a wire brush.
:hamber 2. Detergent
:4)
(1) Wash all other parts with diesel oil.
3thers (2) Clean the lubricating oil path by blowing with compressed air.
(3) Be especially careful so as not to damage or corrode the pans.
(2) inspection procedure
(2.1) 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.
(2.2) 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 if defective.
(2.3) Compressor impeller 18
Inspect any contact trace, chipping, corrosion or deformation.
Replace with a new one if defective.
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