Hi

I am wondering how much pressure should be in the crankcase of a 1.9tdi AWX engine. I have alot of pressure when I remove the oil cap,much more than the normal blow. If I remove the pipe that connects the CCV valve on the top cover very little comes out of it.I have removed the top rocker cover but its a sealed unit and access to the valve is impossible.I am getting some blue smoke on tickover for a few minutes before it clears up. ( New turbo fitted 2 weeks ago ) so its not that.

I read on another fourm that if the catalytic converter is partially blocked it will cause over pressure in the crankcase.

Has any heard of this problem before?

Hi

I am wondering how much pressure should be in the crankcase of a 1.9tdi AWX engine. I have alot of pressure when I remove the oil cap,much more than the normal blow. If I remove the pipe that connects the CCV valve on the top cover very little comes out of it.I have removed the top rocker cover but its a sealed unit and access to the valve is impossible.I am getting some blue smoke on tickover for a few minutes before it clears up. ( New turbo fitted 2 weeks ago ) so its not that.

I read on another fourm that if the catalytic converter is partially blocked it will cause over pressure in the crankcase.

Has any heard of this problem before?

I would be suspecting your new turbo mate, in particular its seals. Is it a rebuilt unit or factory brand new?

Or if the old one failed catastrophically it has damaged the engine.

What sort of mileage are you at?

Check the CCV to compressor inlet pipe for kinks/blockage.

Had a lot of searching to do to sort this one.

The ccv was blocked. Could not get at it because its a part of the valve cover and all glued together.When I ran the engine for a short while with the oil filler cap removed and a gauze taped to the engine cover to stop shlashing, the smoke from the turbo stopped and I had no crankcase over pressure.By the way the turbo is new not a refurb. I got a second hand valve cover with a working ccv valve and problem solved. The over pressure also caused my front crankshaft seal to leak so I had to change it.

Did any one ever hear of this problem before. Engine code AWX