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Piston and head inspection following turbo expiry.

Nagasaki Apr 10, 2020

  1. Nagasaki

    Nagasaki Phooey Gold Supporter Audi Cabriolet Owner Group

    Wonder if anyone is able to offer advice on the Mark's, inlet valve side on the pistons in the picture. Forged wossner have done approx 10k on a K04 Hybrid that let go during the week, pushing oil through the engine.
    Want to be sure this is normal wear before reassembling.
    Inspection of the pipework indicates the surging I had and that got progressively worse may have been oil getting into charge pipework and effecting combustion.
    Turbo bearing oil seal finally gave gave up, making the turbo sound like a cat being strangled.
    Head pictures here for reference too, before cleaning up.
    All advice appreciated.[​IMG][​IMG]

    Sent from my SM-G973F using Tapatalk
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  3. Nagasaki

    Nagasaki Phooey Gold Supporter Audi Cabriolet Owner Group

    Also wondering whether the bores are okay, as previous cross hatching nearly gone and vertical lines appeared in bores. They feel smooth, with no lip at the top, despite there being a dark line from the top of the cylinder wall to where the first ring likely sits.[​IMG][​IMG]

    Sent from my SM-G973F using Tapatalk
  4. Cobra88

    Cobra88 Active Member VCDS Map User TDi Audi A4 Audi Avant Owner Group

    looking at the scratches in the bores your air filter is not filtering properly or your not changing the oil often enough but i suspect the former.


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