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oil bubbling in sump!!!wtf

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by seany26, May 21, 2013.

  1. seany26

    seany26 Member

    Jan 26, 2008
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    Ok here is one to pick everyone's brain, just done a pressure test from my TIP(with breather blocked off) to test for boost leaks and split vac pipes and only thing that I could hear is oil bubbling in the sump. Immediately I thought that the head had blown between a cylinder and oil port but as I write this I'm thinking it is most likely coming from the oil return pipe in the turbo ie through the turbo seals! Might be a no brainer but like to know what every one else thinks anyway. Don't see really how air could get back down through the block and bubble in the oil with non-return valves in place.

    Thanks, any comments welcome.
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  3. Mike.M

    Mike.M Well-Known Member

    Oct 11, 2003
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    Is it a 1.8T?

    If so I think the oil pick up could be blocked
  4. @udi A3

    @udi A3 Site Sponsor
    Site Sponsor VCDS Map User

    May 25, 2012
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    How much pressure was used? When I was investigating boost leaks it was advised any more than 5psi could damage seals. Smoke testing draws a 1psi vaccuum iirc. If you think you have a leak would recomend smoke testing, as it picked up my leaks immediatly.

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