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AFN general turbo question

Discussion in 'A4/S4 forum(B5 Chassis)' started by MaverickTDi, Mar 29, 2013.

  1. MaverickTDi
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    MaverickTDi Member

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    [Mar 29, 2013]
    Hi guys,

    I was hoping that some of you more technically minded chaps might help me with a turbo query?

    Basically I sold a standard OEM AFN turbo via eBay and the buyer requested a refund because the item, in his eyes, wasn't sold as described. Contained within my item description I mentioned that the shaft moved freely and that the bearings feel fine. He claims the shaft is very difficult to rotate. Being a responsible eBayer I accepted his request for a refund and said I will refund when the turbo is back in my possession. Turbo turned up today, so I gave it a once over and I wouldn't say the shaft is difficult to rotate at all. My question is, is the shaft, once rotated, supposed to continue freely? I was under the impression that when the oil feed is connected it lubricates the bearings helping the shaft spin better?

    Any advice on this would be greatly appreciated.

    Thanks.
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  3. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Mar 30, 2013]
    I wouldnt have thaught it would, as without a pressurised oil feed the shaft will have a fair amount of drag.

    I've just tried to spin the shaft on the K03 i've got sat here, and while it did continue to spin after i let go, it stopped almost immediately.
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  4. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Mar 30, 2013]
    diesel turbo's tend to clog up worse than pertol onees, a blast thru the oild system with some brake cleaner and then re oiled would probably make it turn free-er. I saw one that was almost siezed due to ****, the turbo only worked when warm as the cokey sludgey stuff sort of melted to allow it to turn.
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  5. adamss24
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    adamss24 Well-Known Member

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    [Mar 30, 2013]
    You'll damage the seals if you put brake cleaner trough the CHRA...
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  6. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Mar 30, 2013]
    how will you damage seals they are mechanical rings?

    Anything to push the crud thru will suffice, helll, clean oil would probably do it
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