Turbo oil scavenge system

[Rosselder83]

After a bit of advice surrounding the oil scavenge system in the turbo.

After finally getting my car fired up (turbo replacement) I noticed the drivers side turbo was leaking oil from what I assumed to be the sump o-ring.

While I was double checking other stuff I had the outlet pipe off and I noticed there was a small pool of oil sitting at the edge of the compressor housings outlet pipe, not a bit deal if the car had been running for months but by this point it had run for about 3 minutes.

I emailed the chap that did my turbos and he was very happy for me to send it back down to him to check over, I'd assumed the large o-ring on the compressor housing had failed but he said it sounds like the scavenge system isn't working and that's forcing the oil out.

So I'm just looking for a way of testing his theory?

The oil pressure when the car was running was nice and high, the passenger side turbo has no leaks. They both have oil in the sump and in the lines.

What is the direction of flow? Is the oil sucked out of the bottom and returned to the tank? What's the upper line for? Is it just an over flow for the tank?

I can attach pictures if that would help anyone?

Thanks in advance

 

[MisterCorn]

Oil is sucked in from the sumps by the dual scavenge pump on the end of the engine. There are three gears in there which form the two pumps. The oil/air is pumped from the scavenge pumps back to the tank.

The top line is a vent line, so that the scavenge pump isn't trying to create a vacuum in the turbo sump.

MC

 

[Rosselder83]

Ah ok that makes sense, thanks for that.

So if that top hose was blocked in any way that could cause some issues id assume? Introducing a vaccum etc?

 

[MisterCorn]

Ah ok that makes sense, thanks for that.

So if that top hose was blocked in any way that could cause some issues id assume? Introducing a vaccum etc?

I imagine it would cause problems as you say, it wouldn't be able to pump the oil out as well as usual because it would be pulling a vacuum.

MC

 

[Rosselder83]

Great, gives me something to have a look into. Appreciate the responses.

 

[snb993]

Hi
If this is of help, i have what sounds to have a similar problem on mine :?:

It's in for service at the moment and the tech advised that it's " bank 2 oil suction pump to pipe adaptor requires replacement"

I have attached a pic of mine in case it is of use :thumb:

It has created a mist or film over that area for a while and then i cleaned it last week to see if it was easier to spot where it is coming from

:thumb:

 

[Rosselder83]

Interesting, ill have a look next time im under the car and see what my one looks like.

Appreciate you posting that up.