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Thread: Turbo shenanigans

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    Senior Member Futo_gt86's Avatar
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    Default Turbo shenanigans


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    Hi,
    I bought a used T28BB Garrett turbo (not off here) sight un seen from interstate , got it and am really not sure hey.
    The front wheel has no chips or anything, but its the rear that worries me.
    The rear wheel is covered in oil.
    At first I thought it was something that the seller had used to try clean the turbo, but it definitely oil.
    Am I just freaking out? Or have I been duped?
    How much shaft play is ok/normal on a BB turbo?
    Ali
    Last edited by Futo_gt86; 27th August 2012 at 09:15 PM.

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    Senior Member Futo_gt86's Avatar
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    I should just go with gut feeling and rebuild it.
    No guess work then

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    I dunno to be honest, but depending on the mounting position of your turbo, they aren't all that difficult to change. Me personally would install it and then see how it goes.

    A blown engine / rings gone etc would coat the turbo in oil.

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    Senior Member t-nol's Avatar
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    I'm not sure on exact measurements for shaft play, because I normally check by feel. Only because we sell used parts and sticking your fingers in so many turbo's gets you used to how they should be. As for oil, same as Matt said, very hard to diagnose unless you clean it thouroghly and test it really. If not too dodgey, i'd just chuck it in also.

  • #5
    Senior Member Futo_gt86's Avatar
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    Quote Originally Posted by Matt View Post
    I dunno to be honest, but depending on the mounting position of your turbo, they aren't all that difficult to change. Me personally would install it and then see how it goes.

    A blown engine / rings gone etc would coat the turbo in oil.
    Yeah, I thought about that, but it was advertised as upgrading turbo no longer needed.
    It also has oil weep marks on the center core on the rear housing side....
    To me the rear seal is gone and I believe the rear bearing suspect also
    I found a Garrett rebuild kit with a 360 trust bearing for stuff all, might just bite the bullet and get it done, have shaft checked out while it apart, maybe a different front compressor wheel....
    The biggest tell tale, guy won't answer me...
    Last edited by Futo_gt86; 28th August 2012 at 08:11 PM.

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    Quote Originally Posted by Futo_gt86 View Post
    Yeah, I thought about that, but it was advertised as upgrading turbo no longer needed.
    It also has oil weep marks on the center core on the rear housing side....
    To me the rear seal is gone and I believe the rear bearing suspect also
    I found a Garrett rebuild kit with a 360 trust bearing for stuff all, might just bite the bullet and get it done, have shaft checked out while it apart, maybe a different front compressor wheel....
    The biggest tell tale, guy won't answer me...
    I agree with Matt, the guy could've blown an engine, and thought it would look bad on a forum if he mentioned that. Testing it is the best way tell if it really is buggered.

    Although, It is possible that when someone upgrades from a journal bearing to a ballbearing turbo, they can forget to put in an oil restrictor. Then the turbo gets too much oil pressure, and the seals die very quickly after that.
    If that happened in this case, then the best you can hope for is that the guy is enough of an idiot to fit another, more expensive BB turbo to their car without fixing the problem.

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    Senior Member Futo_gt86's Avatar
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    SO, if I rebuild it, how do I work out oil flow?
    Like what size line to feed it and what size restrictor?
    Last edited by Futo_gt86; 28th August 2012 at 11:15 PM.

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    Senior Member t-nol's Avatar
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    You have to measure the oil pressure at the point you're getting the feed from, then go from there. Might not even need a restrictor.

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    Senior Member Futo_gt86's Avatar
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    Spoke to 3 different Turbo rebuilders, GCG, MTQ and Mike Vine - All say T28BB is throw away unit.
    Garrett doesn't do spares for T28BB, only full core which is about $50 bucks less than new turbo. I got Capricorn pricing through work, was just over a grand.
    Man that sucks.
    But after a lengthy discussion with Mike Vine I have new found confidence.
    He said if the turbo had been sat on its end for any amount of time, the oil left in the core would seep out and coat the rear wheel.
    The turbo was sent form Vic packaged facing upwards via snail mail.
    He said if it was a scam, you think the guy would try to clean the oil off - which makes sense.
    And also that there should be a little shaft play with a ball bearing turbo, 1/2 a mm - 1mm, and a small amount of end float.
    Armed with this I have been over it again, and I believe its alright.
    However, I'm still going to drop it off to Mike and get his professional opinion.
    Last edited by Futo_gt86; 31st August 2012 at 09:20 PM.

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    Noooob
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    That adds up... But as I said previously pending the mounting position they aren't difficult to change.

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