turbo rebuild question. shaft is blueish and turbine housing is as well - D-series.org

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Old 06-05-2016, 03:54 PM   #1 (permalink)
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Unhappy turbo rebuild question. shaft is blueish and turbine housing is as well

At what point is the turbine housing that holds the journal bearings considered scrap metal and damaged beyond hope. The bearing on compressor side looks perfectly fine. The turbine side, well not too well. Its all blue and heat damaged. Shaft is pretty heat damaged too. If images don't load when clicked press the "view full size" and try a few times. Not sure why I had to try a few times.





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Old 06-05-2016, 04:26 PM   #2 (permalink)
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I got nothing..

Ive never wanted to rebuild a turbo. Sending it off is alot easier for me.
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Old 06-05-2016, 04:38 PM   #3 (permalink)
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Get the capilers out and see if the whole shaft is the same size.
Most of the time when its blue like that it over heated and it thins out.

But im no pro
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Old 06-05-2016, 05:44 PM   #4 (permalink)
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probably lost it's heat treatment if it got hot enough to turn blue
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Old 06-05-2016, 05:58 PM   #5 (permalink)
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Throw it back together and measure the radial play. That'll tell you if it's in spec or not.
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Old 06-05-2016, 08:06 PM   #6 (permalink)
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Thanks guys. The specs are about .001+/-
Just wanted to try rebuilding to extend my knowledge. It wasn't spinning at idle. That's most likely the cause of bluish color. Prior to dissasembly it had no major shaft play. Just the normal play a good turbo would have. Maybe the idiot who so called "rebuilt" it prior to my purchase tightened the turbine and compressor bolts too much so it wouldn't spin freely. Then ran for few days. Realized he probably messed it up and decided to clean it up and resell. No contacting of housings or chipped fins. Guess I'll try a rebuild first. Run it very quickly to make sure it spins freely on idle. Then pull it out send to GPOP to balance the CHRA.
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To Double D or not to Double D. That is the question.- presently contemplating this "daydreaming" dual engine all wheel drive build.
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