oil bubbling in sump!!!wtf

[seany26]

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.

 

[Mike.M]

Is it a 1.8T?

If so I think the oil pick up could be blocked

 

[@udi A3]

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.