m6smitten

WTF bearing fretting

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Pulled turbocharger apart and found this.

Comp Turbo rebuilt this unit 2 years ago and maybe has 400 miles on it.

Thoughts? 

16485E62-54CC-404D-B064-FC9AD7697D5E.jpeg

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I don't know if those are technically correct, though they may be the right size.

 

My replacement bushings were aluminum from an official KKK rebuild kit.

 

On the left of the image.

PC024441.JPG

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The fretted bearings are Aluminum. Comp Turbo wants to go brass next. They said there was evidence of some heat but it doesn't look like oil starvation to my uneducated eye. More like wobble.

Any chance you could put a micrometer on yours for verification? 

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I used them in my rebuild, but will look to see if I have the old ones.

 

My rebuilder told me at the time he could get the correct parts, but I never followed up.

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Attached is the invoice from when I bought the kit and the part number, though I think they are NLA, that was in 1985.

 

Pictures are at full resolution so you can see that there is no scoring, The brown is just tainting from the exhaust side. Nearest I can tell, they have 30-40K miles, with LOTS of track use, but with letting the Turbo cool down before shutting off the engine. Mobile 1 20W-50.

 

OD: 20 mm

ID: ~13mm

L: 14mm

img554.pdf

PC274544.JPG

PC274545.JPG

PC274546.JPG

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Well I sent them parts of a turbo because Justin at Comp Turbo said they could make the rest in the same spec as the original. What I got back had very little to do with the original unit and I basically had to throw their work out. Not only that, that packed what they sent me so poorly that mounting pieces broke off. It was yet another pointless excercise in my turbo oddessy.

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